2019 Meeting of the Division of Particles & Fields of the American Physical Society

29 Jul 2019, 08:00 → 2 Aug 2019, 17:00 US/Eastern

Northeastern University

Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

The APS Division of Particles & Fields (DPF) Meeting brings the members of the Division together to review results and discuss future plans and directions for our field. It is an opportunity for attendees, including young researchers, to present their findings at multiple parallel and plenary sessions. Participants will also have the chance to talk with DOE and NSF representatives about funding opportunities. This is the main biennial meeting of the U.S. particle physics community, and it includes substantial international participation.

Topics covered will include: LHC Run 2 Results; Physics Beyond the Standard Model; Accelerators, Detectors, Computing; Cosmic Ray Particle Astrophysics; Cosmology & Dark Matter; Electroweak & Top Quark; Field & String Theory; Outreach & Education; Flavor Physics; CP Violation; Higgs Sector; Heavy Ions; Neutrinos; QCD.

Plenary and parallel sessions will take place in large lecture halls or classrooms on the Northeastern University campus, located in the heart of Boston.

DPF2019_latextemplate.tar

DPF2019_poster.png

DPF2019_v13_lowres.png

Monday, 29 July

Plenary Sessions: Monday Morning 1

Convener: Hassan Jawahery (Elementary Particles and High Energy Physics Groups)

1 Welcome from Northeastern College of Science

Speaker: Prof. Michael Pollastri (Northeastern University)

Opening_BarberisOrimoto.pdf

2 Welcome from APS

Speaker: Dr Kate Kirby (APS)

3 Welcome from DPF

Speakers: Prisca Cushman (University of Minnesota (US)), Prof. Prisca Cushman (University of Minnesota)

DPFWelcome.pdf

4 Flavor: Theory

Speaker: Dean Robinson (UC Santa Cruz/ LBL)

dpf_flavor19.pdf

5 Flavor: Rare Decays & Tests of Lepton Flavor

Speaker: Saurabh Sandilya (University of Cincinnati)

2019SandilyaDPF.pdf

6 Flavor: CPV

Speaker: Sheldon Stone (Syracuse University (US))

Flavor-CPV-2019.pdf

7 Flavor: Violation & Dipole Moments

Speaker: Jason Crnkovic (Brookhaven National Laboratory)

jdcrnkovic-dpf-2019.pdf

10:30 Coffee Break

Plenary Sessions: Monday Morning 2

Convener: Tao Han (University of Pittsburgh)

8 String Theory

Speaker: Gary Shiu

APS_2019.pdf

9 Lattice QCD

Speaker: Andreas Kronfeld (Fermilab)

ask4dpf.pdf

10 Heavy Ions

Speaker: Anthony Robert Timmins (University of Houston (US))

atimminsDPF.pdf

11 Education & Outreach

Speaker: kathryn jepsen (Stanford University)

DPF_KJepsen_plenary.pdf

DPF_KJepsen_plenary.pptx

DPF Executive Committee: Meeting (CLOSED)

Conveners: Prisca Cushman (University of Minnesota), Prisca Cushman (University of Minnesota (US))

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US)), stefania gori (UC Santa Cruz)

12 Search for neutral long-lived particles decaying into displaced jets in the ATLAS calorimeter

New long-lived particles (LLPs) are a feature of many extensions to the Standard Model and may elude searches for promptly decaying particles. An analysis of data collected in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector at the Large Hadron Collider is described, focusing on identifying signatures of jets produced by LLPs decaying to Standard Model fermions within the ATLAS calorimeter system. The most recent results of this analysis, published this year using data collected in 2016, are presented, and plans for improving this analysis with the full Run 2 dataset (2015-2018) are summarized.

Speaker: Mason Proffitt (University of Washington (US))

Search for neutral long-lived particles decaying into displaced jets in the ATLAS calorimeter.pdf

13 Searches for new physics using long-lived particles and non-conventional signatures with the CMS detector

Searches for long-lived particles using proton-proton collisions expand the discovery possibilities beyond traditional searches for short-lived particles. These searches often require new algorithm and technique development. Recent results and techniques using data from the CMS experiment will be presented.

Speaker: Todd Adams (Florida State University (US))

CMSLLPAdamsDPF2019v2.pdf

14 Search for Long-lived Particles in the ATLAS Muon Spectrometer

A search for highly displaced vertices resulting from the decay of neutral long-lived particles produced by proton-proton collisions at $\sqrt{s}=$ 13 TeV using 140 fb$^{-1}$of data collected by the ATLAS experiment is in progress. Such long-lived particles are predicted by several beyond the Standard Model theories. Benchmark models used in the analysis will be discussed. For displaced vertices that occur in the ATLAS Muon Spectrometer, three distinct experimental signatures are used. Preliminary results on optimizing the selection criteria for signal will be shown. The expected signal cross section limit reach for long-lived particles decaying in the Muon Spectrometer as a function of lifetime will be reported. Further possible improvements in the analysis will be discussed.

Speaker: Hao Zhou (University of Arizona (US))

DPF Conf Hao.pdf

15 Identifying the Quantum Color Representation of New Particles with Machine Learning

With the great promise of deep learning, discoveries of new particles at the Large Hadron Collider (LHC) may be imminent. Following the discovery of a new particle in an all-hadronic channel, deep learning can also be used to identify the quantum numbers of the new particle. We show that convolutional neural networks (CNNs) using jet images can significantly improve upon existing techniques to identify the quantum chromodynamic (QCD) representation (`color’) of a two-prong jet using its substructure. In addition to demonstrating the capabilities of CNNs for quantum color tagging, we study what information in the jet radiation pattern is useful for classification. These techniques improve the categorization of new particles and are an important addition to the growing jet substructure toolkit, for searches and measurements at the LHC now and in the future.

Speaker: John Alexander Kruper (University of Washington (US))

DPF-2019 (4).pdf

16 Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays

We investigate a class of models where the supergravity model with the standard model gauge group is extended by a hidden sector $U(1)_X$ gauge group and where the lightest supersymmetric particle is the neutralino in the hidden sector. We investigate this possibility in a class of models where the stau is the lightest supersymmetric particle in the MSSM sector and the next-to-lightest supersymmetric particle of the $U(1)_X$-extended SUGRA model. In this case the stau will decay into the neutralino of the hidden sector. For the case when the mass gap between the stau and the hidden sector neutralino is small and the mixing between the $U(1)_Y$ and $U(1)_X$ is also small, the stau can decay into the hidden sector neutralino and a tau which may be reconstructed as a displaced track coming from a high $p_T$ track of the charged stau. Simulations for this possibility are carried out for HL-LHC and HE-LHC. The discovery of such a displaced track from a stau will indicate the presence of hidden sector dark matter.

Speaker: Amin Aboubrahim (Northeastern University)

llp_dpf_2019.pdf

17 Mass Determination of Long-Lived and Invisible Particles with Precision Timing Detectors at the HL-LHC.

The high luminosity run of the Large Hadron Collider (HL-LHC) promises a dataset far larger than previously collected in the preceding LHC runs. With this opportunity comes additional challenges. The increasing number of interactions present in each event adds difficulty to particle reconstruction and pileup disambiguation. To address this issue, ATLAS and CMS have been developing new precision timing detectors capable of measuring the time of arrival of charged particles and resolving spatially overlapping interactions in time. In addition to mitigating pileup-related effects, this new timing information can also be used in searches for new physics, allowing for previously inaccessible measurements.
This talk will describe how to measure the masses of Long-Lived Particles (LLPs) in collision events by using precision timing information, focusing on difficult cases with LLPs decaying to invisible, Dark Matter candidate particles. In addition to being able to reconstruct the mass of LLPs, we show that complete event reconstruction is possible with timing information, allowing for the direct measurement of the masses of Dark Matter candidates and spin-sensitive decay angles. These techniques will be described in the context of BSM searches at the HL-LHC.

Speaker: Zachary Flowers (The University of Kansas (US))

KU_LLP_DPF_2019_v7.pdf

Computing, Analysis Tools, & Data Handling: IRIS-HEP Tutorial

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Jim Pivarski (Princeton University), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Nick Smith (Fermi National Accelerator Lab. (US)), Peter Onyisi (University of Texas at Austin (US))

18 IRIS-HEP Tutorial: Fast columnar data analysis with data science tools (Part 1)

In this tutorial session, we introduce the scientific python ecosystem and extensions thereof that have been developed as part of the IRIS-HEP initiative to better fit the needs of particle physicists. This hands-on tutorial will introduce:
- Scientific programming with Numpy and various tools in its ecosystem: SciPy, Pandas, Scikit-Learn, etc.
- Tools to accelerate python when Numpy is not expressive or fast enough: Numexpr, Numba, GPU acceleration, etc.
- How to efficiently get data from ROOT files into this ecosystem via the uproot library
- Tools to deal with non-trivial data structures in columnar array format, such as jagged arrays, arrays-of-struct, etc. via the awkward-array library
- Existing and forthcoming tools to deal with histograms as data structures

Speakers: Jim Pivarski (Princeton University), Nick Smith (Fermi National Accelerator Lab. (US))

Lectures

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

19 Dark photons in the decay of a scalar particle

The couplings of the Standard Model sector to the scale invariant degrees of freedom can open the possibility to study the hypothesized particles called as dark photons (DP). The latter are associated with dark matter, neutralinos and others. The model for the DP particle solvable in 4-dimensional space-time is studied at the lowest order of perturbative theory using canonical quantization. The model is gauge and scale invariant and these symmetries are spontaneously broken with the following properties: the DP field is massive. The Dalitz-like decay of the (Higgs-like) scalar boson into a single photon and DP is studied. The interaction between DP and quarks is mediated by the derivative of the scalar field - the dilaton. The mass of the dilaton does not enter the final solutions. The limits are set on the DP mass, the mixing strength between the standard photon and DP. The emitted energy of the single photon is encoded with measuring of the missing of the recoil DP.
This study can be used to probe the DP sector at current experimental facilities, and at new experiment FASER at the LHC which will be operational in 2021.

Speaker: Dr Gennady Kozlov (JINR)

Kozlov_DP_2019_2.pdf

20 The Light Dark Matter eXperiment, LDMX

The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for the origin of dark matter sharpen the focus on a narrower range of masses: the natural scenario where dark matter originates from thermal contact with familiar matter in the early Universe requires the DM mass to lie within about an MeV to 100 TeV. Considerable experimental attention has been given to exploring Weakly Interacting Massive Particles in the upper end of this range (few GeV – ~TeV), while the region ~MeV to ~GeV is largely unexplored. Most of the stable constituents of known matter have masses in this lower range, tantalizing hints for physics beyond the Standard Model have been found here, and a thermal origin for dark matter works in a simple and predictive manner in this mass range as well. It is therefore a priority to explore. If there is an interaction between light DM and ordinary matter, as there must be in the case of a thermal origin, then there necessarily is a production mechanism in accelerator-based experiments. The most sensitive way, (if the interaction is not electron-phobic) to search for this production is to use a primary electron beam to produce DM in fixed-target collisions. The Light Dark Matter eXperiment (LDMX) is a planned electron-beam fixed-target missing-momentum experiment that has unique sensitivity to light DM in the sub-GeV range. This contribution will give an overview of the theoretical motivation, the main experimental challenges and how they are addressed, as well as projected sensitivities in comparison to other experiments.

Speaker: Jeremy Mans (University of Minnesota (US))

aps_dpf_19_LDMX_Mans.pdf

21 Detecting Light, High-Energy, Low-Interacting Particles with FASER

The flagship LHC experiments are arranged radially outward from the proton interaction point, but dark matter mediators and other new light particles could be produced in a collimated beam by meson decays along the beam axis, and escape detection. FASER (ForwArd Search ExpeRiment) will explore this “blind spot” for the first time. The experiment will be sited 480 meters from the ATLAS interaction point, along a line tangent to the proton beams. Long-lived, weakly coupled TeV-energy particles can traverse the intervening rock and LHC infrastructure before decaying inside FASER, with little background from Standard Model processes. The collimated nature of the signal allows FASER to be compact, and re-use of components from other experiments allow it to be constructed quickly and inexpensively. FASER will be installed during the current LHC long shutdown and begin collecting data in 2021.

Speaker: Savannah Rose Shively

DPF faser - fd2.pdf

DPF faser - fd.pdf

22 Searching for dark photons with PADME

The PADME experiment, at the Laboratori Nazionali di Frascati of INFN, is a fixed-target, missing-mass experiment designed to search for a dark photon (A’), the hypothetical gauge boson of a new U(1) symmetry in a hidden sector of particles neutral under Standard Model interactions. The design performance of the experimental apparatus allows the investigation of A’ mass ranges up to 23.7 MeV and values of the effective coupling between A’ and the photon (\epsilon) greater than 10^-3, using a positron beam striking a thin diamond target. The PADME experiment has been in operation since October 2018 and performed a first detector and beam-commissioning run for 5 months. The statistics of the data sample collected could also allow the extraction of preliminary physics results. The talk will review the experience gained with the detector and beam operation. Additionally, the status of data validation and understanding in terms of detector performance and both beam-induced and physics backgrounds will be discussed. Finally, the physics potential of PADME and possibilities for future upgrades will be explored.

Speaker: Andre Frankenthal (Cornell University)

DPF_2019_AndreFrankenthal_v3.pdf

23 The Heavy Photon Search Experiment

The Heavy Photon Search experiment searches for an electro-produced dark photon using an electron beam provided by the CEBAF accelerator at the Thomas Jefferson National Accelerator Facility. HPS has successfully completed two engineering runs. In 2015 using a 1.056 GeV, 50 nA electron beam, 1.7 days (10 mC) of data was obtained and 5.4 days (92.5 mC) of data was collected in 2016 using a 2.3 GeV, 200 nA electron beam. In addition, HPS will complete its first physics run in the summer of 2019. HPS looks for dark photons through two distinct methods – a resonance search in the e+e invariant mass distribution above the large QED background (large dark photon-SM particles coupling region) and a displaced vertex search for long-lived dark photons (small coupling region). HPS employs a compact spectrometer, matched to the forward kinematic characteristics of A’ eletro-production. The detector consists of a Silicon tracker for momentum analysis and vertexing and a PbWO4 electromagnetic calorimeter for particle ID and triggering. Both analysis are complete for the 2015 engineering run and demonstrate the full functionality of the experiment that will probe hitherto unexplored parameter space with future, higher luminosity runs. Results from the 2015 dataset will be presented as well as an update on 2016 analysis and the status of the 2019 physics run.

Speaker: Cameron Bravo (SLAC)

bravo19dpf.pdf

Field & String Theory

parallel sessions

Conveners: Mirjam Cvetic (University of Pennsylvania), Mirjam Cvetic (Departm.of Physics & Astronomy), Xi Yin (Harvard University)

24 Contact Geometry and Quantum Mechanics

Quantization together with quantum dynamics can be simultaneously formulated as the problem of finding an appropriate flat connection on a Hilbert bundle over a contact manifold. Contact geometry treats time, generalized positions and momenta as points on an underlying phase-spacetime and reduces classical mechanics to contact topology. Contact quantization describes quantum dynamics in terms of parallel transport for a flat connection; the ultimate goal being to also handle quantum systems in terms of contact topology. Our main result is a proof of local, formal gauge equivalence for a broad class of quantum dynamical systems—just as classical dynamics depends on choices of clocks, local quantum dynamics can be reduced to a problem of studying gauge transformations. We further show how to write quantum correlators in terms of parallel transport and in turn matrix elements for Hilbert bundle gauge transformations, and give the path integral formulation of these results. Finally, we show how to relate topology of the underlying contact manifold to boundary conditions for quantum wave functions.

Speaker: Prof. Andrew Waldron (Department of Mathematics and QMAP, University of California Davis,)

Contact Geometry and Quantum Mechanics.pdf

25 3d Matter Coupled to Chern-Simons Field, Spontaneous Breaking of Scale Invariance and Fermion-Boson Mapping

The singlet sector of vector, large $N$, 3d field theory corresponds to Vasiliev higher spin theory on $AdS_4$. Will discuss three dimensional $U(N)$ symmetric field theory with fermion and boson matter coupled to a topological Chern-Simons field. In the presence of a marginal deformation will determine the conditions for the existence of a phase with spontaneous breaking of scale invariance. In this phase the ground state contains massive $U(N)$ quanta and a massless $U(N)$ singlet bound state goldstone boson - the Dilaton. Will show that such a phase appears only in the presence of a marginal deformation.The massless Dilaton appears in the spectrum provided certain relations between coupling constants are satisfied. Will discuss the fermion-boson mapping and show that the conditions for spontaneous breaking of scale invariance in the boson and fermion theories are copies of each other.
Will present recent progress on the older papers:
M M and J. Zinn-Justin JHEP 1501 (2015) 054 arXiv:1410.0558 [hep-th]
W. A. Bardeen and M M JHEP 1406 (2014) 113 arXiv:1402.4196 [hep-th]

Speaker: Prof. Moshe Moshe (Technion - Israel Inst. of Techniology)

Boston 2019 Moshe.pdf

26 Compensator fields in dimensional reduction and compactification without truncation

In dimensionally reduced theories with gauge (or diffeomorphism) invariance, consistency of the Kaluza-Klein ansatz requires the introduction of compensator fields. The compensator fields project gauge-variant field fluctuations to their horizontal components, which in turn determine the gauge-invariant moduli space metric that appears in kinetic terms of the lower dimensional theory. The compensator fields must be introduced "by hand" in dimensional reduction (i.e., compactification truncated to zero modes), but arise automatically in the full untruncated theory. For the U(1), Yang-Mills theory, and pure Einstein gravity compactified on an arbitrary compact manifold, we re-express the full untruncated parent theory in lower dimensional language, and identify the compensator fields. One of their known geometric interpretations features prominently. The moduli space of gauge fields (or metrics) on the compact manifold can be regarded as a principal bundle whose fiber is the space of gauge transformations. The compensator fields arise as a repackaging of the connection on this bundle.

Speaker: Prof. Michael Schulz (Bryn Mawr College)

Schulz_DPF_2019.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

27 Neutrino Oscillations In Matter

As long-baseline efforts are ramped up over coming years, it is important understand how the presence of matter affects neutrino oscillations. In this talk I will discuss precision oscillation probability formulas with matter effects. We have developed expressions that are simple, precise, and an actual expansion in the small parameters: $\sin^2\theta_{13}$ and $\Delta m^2_{21}/\Delta m^2_{31}$. In addition, our expressions return to the exact expression in vacuum. I will also present some recent results on understanding CP violation in matter which show that the matter effect of the Jarlskog simply factorizes into atmospheric and solar contributions.

Speaker: Dr Peter Denton (Brookhaven National Laboratory)

Denton_DPF19.pdf

28 New Oscillation Results from NOvA

NOvA is a long-baseline neutrino experiment that uses an upgraded NuMI neutrino source at Fermilab and a 14 kiloton detector at Ash River, Minnesota. The detector has a highly active, finely segmented design that offers superb event identification capability. This talk will report the latest results on muon (anti-)neutrino disappearance and electron (anti-)neutrino appearance from NOvA. The data used in these analyses include the new anti-neutrino beam data taken in 2018. The new NOvA results indicate normal mass hierarchy.

Speaker: Jianming Bian (University of California Irvine (US))

nova_dpf_2019_07_29.pdf

29 First results on ProtoDUNE-SP LArTPC performance from a test beam run at the CERN Neutrino Platform

The single phase ProtoDUNE detector is a prototype detector for the Deep Underground Neutrino Experiment. It was built at CERN and has accumulated millions of test beam particles with momenta between 0.3 GeV/c to 7 GeV/c during the beam runs in the H4 VLE dedicated charged particles beamline at the CERN Neutrino Platform in late 2018. In this talk, I will present the preliminary detector performance results, focusing on the detector calibration and the calorimetric reconstruction of the beam particles. I will also discuss the perspective of physics measurements using ProtoDUNE data.

Speaker: Tingjun Yang (FNAL)

protodune_yang.pdf

30 ProtoDUNE-SP Proton Analysis

Next generation neutrino oscillation experiments enter a new era of precision measurements employed in the search for CP violation and mass hierarchy. Charged-current (CC) interactions are the primary detection channels for neutrino oscillation experiments. Protons are one of the final state particles in neutrino CC interactions such as CC quasi-elastic (CCQE) and CC resonance (CCRES) interactions, and hence they play an essential role in reconstructing the neutrino total energy in the interactions.

Liquid argon time projection chambers (LArTPC) provide excellent tracking and calorimetric capabilities, enabling us to study neutrino-nucleus interactions in unprecedented detail. The ProtoDUNE-SP experiment utilizes the CERN H4 beam line with known particle type (hadrons and electrons) and incident energy. This provides a controlled environment for better understanding of the interactions taking place within a LArTPC detector. In this talk, I will present the analysis result using the ProtoDUNE-SP proton beam data.

Speaker: Dr Heng-Ye Liao (Kansas State University (US))

20190729_HY_DPF.pdf

31 The ANNIE Experiment

The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) at Fermilab uses 30 tons of gadolinium-enhanced water to capture and detect the otherwise invisible neutrons produced in complex neutrino-nucleus interactions in addition to traditional water-Cherenkov charged particle detection. The number of these final-state neutrons help constrain the interaction type and the kinematics of the target nucleus, which are major sources of uncertainty in neutrino interaction event simulation and reconstruction. The Phase I run measured background neutrons associated with the neutrino beam, including “dirt neutrons” from neutrino interactions outside the detector and “skyshine neutrons” from the beam which scatter into the experimental hall. This talk will discuss the ANNIE experiment, science goals and the implications of the Phase I results.

Speaker: Dr Jonathan Eisch (Iowa State University)

DPF2019_Eisch_ANNIE.pdf

Particle Detectors

parallel sessions

Conveners: Prof. Bjoern Penning (Brandeis University), Prof. Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

32 Upgrade of the CMS electromagnetic calorimeter barrel readout electronics for the High-Luminosity LHC

The CMS electromagnetic calorimeter (ECAL) is a homogeneous calorimeter made of about 75000 lead tungstate scintillating crystals. In view of the high-luminosity phase of the LHC, the ECAL readout electronics must be upgraded to cope with the more stringent requirements in terms of trigger latency and rate, as well as the harsh radiation environment and the extreme level of pile-up events, with up to 200 simultaneous proton-proton collisions. The new electronics will transmit the data in streaming mode from the front-end electronics to the off-detector electronics, where the trigger primitives will be formed in powerful FPGAs. The front-end electronics will feature two new radiation-hard chips: a dual gain trans-impedance amplifier (TIA) and a sampling ADC with lossless data compression. The TIA choice allows the preservation of the fast pulse shape of the lead tungstate coupled to avalanche photodiodes (APD), and it is more resistant to the noise increase due to the radiation-induced APD leakage current. An important characteristic of the new design will be the capability to provide precision timing measurements, of the order of 30 ps, for photons and electrons above 50 GeV. The excellent time resolution will improve the overall CMS physics performance by mitigating the high pile-up effects. First characterization results of the TIA chip will be shown, and studies of energy and timing resolution performed in beam tests with the electronic prototypes will be presented.

Speaker: Prof. Bob Hirosky (University of Virginia (US))

DPF19-Hirosky.pdf

33 Latest Results on the Radiation Tolerance of Diamond Detectors

As nuclear and high energy facilities around the world are upgraded and move to higher and higher intensities, the detectors in use at these facilities must become more radiation tolerant. Diamond is a material in use at many facilities due to its inherent radiation tolerance and ease of use. In this talk, we will present the results of recent radiation tolerance measurements of the highest quality poly-crystalline Chemical Vapor Deposition (pCVD) diamond material for a range of proton energies, pions and neutrons up to a fluence of 2 x 10^16 particles/cm^2. From this data we are able to derive the damage constants as a function of energy and particle species and compare with theoretical models. We will also present the recent measurements of the rate dependence of pulse height for non-irradiated and irradiated pCVD diamond pad and pixel detectors. The results we will present include detectors tested over a range of particle fluxes up to 20 MHz/cm$^2$ with both pad and pixel readout electronics. Our results indicate the pulse height of unirradiated poly-crystalline CVD diamond detectors and the neutron irradiated poly-crystalline CVD diamond detectors measured with the pad readout show no dependence on the particle flux.

Speaker: Lukas Baeni (ETH Zurich (CH))

Baeni_Radiation_Tolerance_of_Diamond_Detectors_v4.pdf

34 CMS HL-LHC Pixel Detector Electronic Readout

In the High Luminosity-LHC, the CMS Tracker will deliver data with gigabit rate. The pixel detector will be read out using a custom chip developed by the RD-53 collaboration. Low-mass, high bandwidth electrical links transfer the data at a speed of 1.28 Gbps from the readout chip to a low power gigabit transceiver. This transceiver will further send the serialized data at the rate of 10 Gbps through optical links to the Tracker backend electronics. The design, development, and plans for this readout chain will be discussed.

Speaker: Alice Bean (Alice)

dpf-elink-7-19.pdf

35 Test of Gigabit Transceiver ASIC with 34-AWG twin-axial cable for the ATLAS ITk Pixel detector

The Gigabit Transceiver (GBCR) is one of the ASICs designed for the ATLAS Inner Tracker (ITk) upgrade project. It recovers the high-frequency loss of the data in the transmission cable that brings signals from the pixel readout chip. There are 4 receiver channels, each operating at 5.12 Gbps, and a transmitter channel operating at 2.56 Gbps. The first prototype has been designed and tested with the 5-meter 34-AWG twin-axial cable. We find that the tests yield favorable results. The second prototype is under development with a change of the number of receiver channels and operating frequency. We will report on the prototype, existing tests, and future plans.

Speaker: Peilong Wang (Southern Methodist University (US))

Test of Gigabit Transceiver ASIC with 34-AWG TwinAx DPF 20190729.pdf

36 Performance of new front-end electronics for the Phase-II upgrade of the ATLAS small-diameter Monitored Drift Tube detector

The Monitored Drift Tube (MDT) detector will be used at the first-level trigger to improve the muon transverse momentum resolution and thus reduce the muon trigger rate for high-luminosity LHC runs. The small-diameter MDT (sMDT), with half the drift-tube diameter of the MDT and using the same readout electronics, will be installed in detector regions where MDT chambers will not fit. A new trigger and readout system has been proposed and the current readout electronics will be replaced. A new analog Application-Specific Integrated Circuit (ASIC) of Amplifier/Shaper/Discriminator circuit and a new digital ASIC of time-to-digital converter (TDC) are developed. Front-end boards integrating these ASICs are developed and tested. In this talk, we will show performances of these ASICs and joint test results with sMDT chambers.

Speaker: Yuxiang Guo (University of Michigan)

Performance of new frontend electronics for the Phase-II upgrade of the ATLAS small-diameter Monitored Drift Tube detector.pptx

QCD & Heavy Ions

parallel sessions

Conveners: Prof. Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

37 Higher order corrections for jet physics at the LHC

Collimated jets of hadrons serve as precision tests of the standard model and in particular QCD. For example, jets observables have been applied extensively to constrain parton distribution functions and to probe the hot and dense medium created in heavy-ion collisions, as well as to the search for physics beyond the standard model. In this talk, I will mainly focus on recent higher order corrections for jet production cross sections at the LHC. Recently significant progress has been made toward achieving an improved understanding both at fixed order and using all order resummation techniques. In addition, I will discuss several high precision results for jet substructure observables relevant for the LHC physics program both in proton-proton and heavy-ion collisions.

Speaker: Felix Ringer (Lawrence Berkeley National Laboratory)

DPF19_FRinger.pdf

38 Vector boson + jets cross section measurements at LHC

The latest results from LHC on the vector boson (W or Z) production in association with jets will be discussed.

Speaker: Avto Kharchilava (The State University of New York SUNY (US))

Kharchilava_Vjets_DPF.pdf

39 Results on Hard Probes from LHC Heavy Ion Collisions

Collisions of ultra-relativistic heavy ions is the only known way of experimentally studying new form of QCD matter at high temperatures and energy densities. In such collisions, a state of deconfined quarks and gluons known as the quark-gluon plasma (QGP) is produced. Hard probes or partons from early-time interactions with large momentum transfer are produced prior to the formation of the QGP, and thus act as tomographic probes of the medium. Studies of the final-state particles produced in these hard scatterings can provide important information about the properties and interactions of the medium. Some of the key observables include nuclear modification factors for hadrons and jets as well as various jet substructure observables. An overview of the latest hard probes results from the LHC will be presented.

Speaker: Ran Bi (Massachusetts Inst. of Technology (US))

dpf_hard_probes_190729.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

40 Probing Hidden Sectors with Flavor

I will discuss models with hidden sectors that can be probed with flavor.

Speaker: Jared Evans

FlavorsHiddenSectors.pdf

41 Dark Sectors at LHCb

Searches for the proposed dark sector analogs of the photon and the Higgs boson at the LHCb experiment will be presented. LHCb has world-leading sensitivity to both hypothetical particles in some mass regions. Planned future upgrades and the resulting physics prospects will also be discussed.

Speaker: Constantin Weisser (MIT)

Weisser_DPF_DS@LHCb.pdf

42 New results on the search for rare kaon events with the KOTO detector

The KOTO experiment was designed to observe and study the K$^{0}_{L} \rightarrow \pi^{0}\nu\bar{\nu$ decay at J-PARC. The Standard Model (SM) prediction for the process is (3.0$\pm$ 0.3) x 10$^{-11}$ with small uncertainties [1]. This unique \emph{golden} decay is an ideal candidate to probe for new physics and can place strict constraints on beyond the standard model (BSM) theories. The previous experimental upper limit of the branching ratio was set by the KEK E391a collaboration as BR $<$ 2.6 x 10$^{-8}$ [2].

The signature of the decay is a pair of photons from the $\pi^{0}$ decay and no other detected particles. For the measurement of the energies and positions of the photons, KOTO uses a Cesium Iodide (CSI) electromagnetic calorimeter as the main detector, and hermetic veto counters to guarantee that there are no other detected particles.
KOTO's initial data was collected in 2013 and achieved a similar sensitivity to the E391a result [3]. We completed hardware upgrades and had the first major physics runs in 2015. This talk will present KOTO's new results on the search for detecting K$^{0}_{L} \rightarrow \pi^{0}\nu\bar{\nu}$ [4].

[1] J. Brod;..et al.: Phys. Rev. D. 83, 034030 (2011)\
[2] J. Ahn et al., Phys. Rev. D. 81, 072004 (2010)\
[3] J. K. Ahn et al., Prog. Theor. Phys. 021C01 (2017)\
[4] J. K. Ahn et al., Phys. Rev. Lett. 122, 021802 (2019)

Speaker: Dr Brian Beckford (University of Michigan)

APS DPF 2019 Beckford.pdf

43 Status on the Search for $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$ with the KOTO Experiment

The KOTO experiment at the J-PARC research facility in Tokai, Japan aims to observe and measure the rare decay of the neutral kaon, $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$. This decay has a Standard Model (SM) predicted branching ratio (BR) of $(3.00 \pm 0.30) \times 10^{-11}$ [1]. While this decay is extremely rare, it is one of the best decays in the quark sector to probe for new physics beyond the SM due to small theoretical uncertainties. The E391a experiment at KEK 12-GeV PS previously searched for $K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$ events and set a limit of BR($K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$) $< 2.6 \times 10^{-8}$ in 2010 [2]. In 2018, KOTO set a new experimental limit of BR($K_L^0 \rightarrow \pi^0 \nu \bar{\nu}$) $< 3.0 \times 10^{-9}$ from data collected in 2015, improving the best experimental upper limit by an order of magnitude [3]. From 2016 to 2018, KOTO collected around 2.5 times more data than in 2015, and the analysis of this dataset is currently underway. This talk will focus on the progress and current status of the 2016-2018 data analysis.

[1] A. Buras et al., JHEP, vol. 1511, no. 033 (2015)
[2] J. K. Ahn et al., Phys. Rev. D, vol. 81, p. 072004 (2010)
[3] J. K. Ahn et al., Phys. Rev. Lett. vol. 122, p. 021802 (2019)

Speaker: Ms Melissa Hutcheson (University of Michigan)

HutchesonAPSDPFTalk_v3.pdf

15:30 Coffee Break

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US)), stefania gori (UC Santa Cruz)

44 A Search for Fully Hadronic Final State Vector-Like Quark Pair Production in 13 TeV pp Collisions using CMS Data

We describe a search for the production of a pair of vector-like quarks (VLQ's) with masses greater than 1000 GeV/c$^2$ each decaying into a $b$ quark and a Higgs Boson using data from proton-proton collisions at center-of-mass energy of 13 TeV recorded by the CMS Experiment. Since the predominant decay mode of the Higgs boson is to a $b \bar{b}$ pair, the analysis focuses on a final state consisting of jets resulting from the $b(\bar{b})$ quarks produced in the VLQ decays. Requiring that the jets are consistent with production of a pair of Higgs, that the reconstructed VLQ's have equal masses and that several of the jets are tagged as originating from $b(\bar{b})$ quarks, greatly reduces the background from Standard Model processes. We use a $\chi^2$ procedure based on the Higgs masses and the equality of the two VLQ masses to select the correct combinations of jets. Since for highly boosted Higgs, the two jets resulting from the daughter $b(\bar{b})$ quarks might be merged to a single jet, we carry out three independent analyses depending on the number of observed jets. We present the expected exclusion limits from the three combined analyses corresponding to 138 fb$^{-1}$ of integrated luminosity collected by CMS during the 2016, 2017 and 2018 run period.

Speaker: Rikab Gambhir (Rutgers State Univ. of New Jersey (US))

DPF.pdf

45 Search for Supersymmetry at CMS in Events with Large Jet Multiplicity and Low Missing Transverse Momentum at sqrt(s)=13 TeV

In traditional searches for physics beyond the standard model, a requirement of high missing transverse momentum (MET) is often used. However, without any signs of significant deviations from the standard model expectations, we decided to relax this requirement for the search reported in this talk. Many new physics models, including versions of supersymmetry (SUSY) characterized by R-parity violation, compressed mass spectra, long decay chains, or with additional hidden sectors predict the production of events with low MET, many jets, and top quarks. The results of a general search for new physics featuring two top quarks and six additional light flavor jets are reported. The search is performed using events with at least seven jets and exactly one electron or muon. No requirement on MET is imposed. With the use of a neural-network-based signal-to-background discriminator, a background estimation was achieved where more traditional techniques was not an option. The study is based on a sample of proton-proton collisions at sqrt(s) = 13 TeV corresponding to 77.4 fb-1 of integrated luminosity collected with the CMS detector at the LHC in 2016 and 2017. Results of the search are interpreted for pair production of scalar top quarks in the frameworks of stealth SUSY and SUSY with R-parity violation.

Speaker: Christopher Madrid (Baylor University (US))

StealthRPVStop_DPF.pdf

46 Search for low-mass resonances decaying into two jets and produced in association with a photon using $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

Many models predict new particles with sizeable couplings to quarks and gluons. A search is performed for localized excesses in dijet mass distributions of low-dijet-mass events produced in association with a high transverse energy photon. The search uses up to 79.8 fb$^{-1}$ of LHC proton–proton collisions collected by the ATLAS experiment at a center-of-mass energy of 13 TeV during 2015–2017. Two variants are presented: one that makes no jet flavour requirements and one that requires both jets to be tagged as b-jets. The observed mass distributions are consistent with multi-jet processes in the Standard Model. The data are used to set upper limits on the production cross-section for a benchmark Z’ model and, separately, on generic Gaussian-shape contributions to the mass distributions, extending the current ATLAS constraints on dijet resonances to the mass range between 225 and 1100 GeV.

Speaker: Gang Zhang (Tsinghua University (CN))

Search for low-mass resonances decaying into two jets and produced in association with a photon v2.pdf

47 Searching for resonant HH production in the bbqq'lnu final state at CMS

New, massive bosons could be found with the LHC. Theories with warped extra dimensions and supersymmetry predict the existence of such resonances, which for some model parameters, have a significant branching fraction to two Higgs bosons. A search for such particles in the HH->bbWW->bbqq'lnu channel with the CMS detector is presented. The analysis uses data collected during Run 2 of the LHC at a centre-of-mass energy of 13 TeV. Background is suppressed by reconstructing the full HH decay chain using jet substructure techniques and the identification of leptons with nearby, boosted jets. A two-dimensional template fit in the plane of resonance the mass and the H->bb mass is used to characterize potential signal with this final state.

Speaker: Nickolas Mc Coll (University of California Los Angeles (US))

nmccoll_7_12_19_apsDPF.pdf

48 High-energy hadronic processes in the presence of Lorentz violation

An approach is presented for the calculation of high-energy hadron-lepton and hadron-hadron interactions at large momentum transfer in the presence of Lorentz-violating background fields affecting quarks. Cross sections for deep inelastic scattering and the Drell-Yan process are calculated at leading order for minimal and nonminimal Lorentz violation using the Standard-Model Extension, an effective field theory characterizing general Lorentz-violating effects for the Standard Model fields and General Relativity. Estimated bounds are placed using sidereal-time analyses of existing HERA, LHC, and future US-based electron-ion collider data.

Speaker: Mr nathan sherrill (Indiana University)

nlsherrill_dpf2019.pdf

Computing, Analysis Tools, & Data Handling: IRIS-HEP Tutorial

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Jim Pivarski (Princeton University), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Nick Smith (Fermi National Accelerator Lab. (US)), Peter Onyisi (University of Texas at Austin (US))

49 IRIS-HEP Tutorial: Fast columnar data analysis with data science tools (Part 2)

In this tutorial session, we introduce the scientific python ecosystem and extensions thereof that have been developed as part of the IRIS-HEP initiative to better fit the needs of particle physicists. This hands-on tutorial will introduce:
- Scientific programming with Numpy and various tools in its ecosystem: SciPy, Pandas, Scikit-Learn, etc.
- Tools to accelerate python when Numpy is not expressive or fast enough: Numexpr, Numba, GPU acceleration, etc.
- How to efficiently get data from ROOT files into this ecosystem via the uproot library
- Tools to deal with non-trivial data structures in columnar array format, such as jagged arrays, arrays-of-struct, etc. via the awkward-array library
- Existing and forthcoming tools to deal with histograms as data structures

Speakers: Jim Pivarski (Princeton University), Nick Smith (Fermi National Accelerator Lab. (US))

Lectures

DOE: Energy Frontier

Convener: Abid Patwa (U.S. Department of Energy)

50 DOE Energy Frontier Overview

Speaker: Abid Patwa (U.S. Department of Energy)

DPF-Meeting_2019_PI-Meeting-EnergyFrontier-FINAL4.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

51 Dark Matter, Galactic Dynamics, and Gaia

We are in an age of large precision astrometric datasets, most recently thanks to ESA's Gaia mission, which has already measured the full 6-dimensional phase space of over 7 million stars. One of the many exciting physics outcomes of Gaia is the ability to measure the Milky Way's gravitational potential, as inferred from stellar kinematics. This can be leveraged to make precise statements about the underlying fundamental theory that governs the dynamics of our galaxy. In this talk, I will discuss how Gaia can be used to strongly test models of collisionless dark matter against alternative theories such as low-acceleration modifications to gravity and emergent long-range forces. I will also discuss recent efforts to reconcile measurements of the local dark matter density via the Jeans equation with the recent observations in the Gaia dataset indicating that stars in the Milky Way's disk are not in equilibrium.

Speaker: Matthew Moschella (Princeton University)

Moschella_DPF2019.pdf

52 Studying the influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies

We study how the void environment affects the formation and evolution of
galaxies in the universe by comparing the ratio of dark matter halo mass to
stellar mass of galaxies in voids with galaxies in denser regions. Using
spectroscopic observations from the SDSS MaNGA DR 15, we estimate the dark
matter halo mass of \Nvoid void galaxies and \Nwall galaxies in denser regions.
We use the velocity of the H$\alpha$ emission line to measure the rotation
curve of the galaxies, since the kinematics of the interstellar medium is
smoother than stellar kinematics. We observe a relationship between a
galaxy's absolute magnitude and its ratio of dark matter halo mass to stellar
mass, where fainter galaxies have a higher fraction of dark matter than
brighter galaxies. We find that for a given range in absolute magnitude, void
galaxies have similar ratios of dark matter halo mass to stellar mass to
galaxies in denser regions.

Speaker: Prof. Regina Demina (University of Rochester)

Rotation_curves_DPF2019.pdf

Rotation_curves_DPF2019.pptx

53 Shapes of Self-Interacting Dark Matter

If dark matter has strong self-interactions, future astrophysical and cosmological observations, together with a clearer understanding of baryonic feedback effects, might be used to extract the velocity dependence of the dark matter scattering rate. To interpret such data, we should understand what predictions for this quantity are made by various models of the underlying particle nature of dark matter. In this paper, we systematically compute this function for fermionic dark matter with light bosonic mediators of vector, scalar, axial vector, and pseudoscalar type. We do this by matching to the nonrelativistic effective theory of self-interacting dark matter and then computing the spin-averaged viscosity cross section nonperturbatively by solving the Schrodinger equation, thus accounting for any possible Sommerfeld enhancement of the low-velocity cross section. In the pseudoscalar case this requires a coupled-channel analysis of different angular momentum modes due to the structure of the effective potential experienced by the dark matter.

Speaker: Aditya Parikh (Harvard University)

SIDM_DPF_AdityaParikh.pdf

54 Electroweak Symmetric Dark Matter Balls

We show that a simple Higgs-portal dark matter model can contain stable non-topological soliton states of dark matter. This macroscopic dark matter candidate has its interior in an electroweak symmetry unbroken vacuum. They can have its radius around the atomic scale and mass as large as $10^{26}$ GeV. We discuss the formation of these dark matter balls from the first order electroweak phase transition in the early universe. Such dark matter candidates can be searched in a wide range of experiments, we provide constraints from WIMP-like direct detection and also from multi-scattering events in large volume liquid scintillator neutrino detectors, ancient mica and also Xenon-1T.

Speaker: Bithika Jain (ICTP-SAIFR)

Electroweak symmetric dark matter balls.pdf

55 Exotic Compact Objects in a Dissipative Dark Sector

We show how a simple dissipative dark sector can form exotic compact objects that vary in size from a few to millions of solar masses. These exotic compact objects may be detected and their properties measured at new high-precision astronomical observatories, giving insight into the particle nature of the dark sector without the requirement of non-gravitational interactions with the visible sector.

Speaker: Jae Hyeok Chang (YITP, Stony Brook)

DPF2019_Chang.pdf

56 Fast and improved cosmic ionization/thermal history including dark matter energy injection

I present a new public Python package, DarkHistory, for computing the effects of dark matter annihilation and decay on the temperature and ionization history of the early universe. DarkHistory, which is fast, convenient, and easy to use, simultaneously solves for the evolution of the free electron fraction and gas temperature, and for the cooling of annihilation/decay products and the secondary particles produced in the process. DarkHistory self-consistently includes the effects of both astrophysical and exotic sources of heating and ionization, and automatically takes into account backreaction, where modifications to the ionization/temperature history in turn modify the energy-loss processes for injected particles. To demonstrate some of DarkHistory's capabilities, I use it to determine the effects of dark matter annihilation/decay on the global 21cm signal, and also on the epoch of reionization.

Speaker: Gregory Ridgway (Massachusetts Institute of Technology)

GRidgway_DPF2019_Cosmic_Histories_v3.pdf

57 New Aspects of Millicharged Dark Matter at 21-cm

If a component of dark matter is millicharged, dark matter-baryon scattering can induce large effects in the 21-cm global signal by cooling the baryons. This can be achieved without being excluded by other cosmological, astrophysical or terrestrial constraints. We point out two important effects which have been overlooked in previous analyses. First, introducing a dark interaction between the millicharged component and the neutral component of dark matter increases the heat capacity of the dark sector, making the cooling process more efficient at higher dark matter masses. Second, the scattering of millicharged dark matter off neutral hydrogen and helium is an important effect that may dominate the cooling of baryons during the cosmic dark ages. Due to a combination of these two effects, the anomalous 21-cm global signal observed by the EDGES collaboration can now be explained by a sub-percent millicharged component of dark matter with a mass as large as 50 GeV. Interestingly, the cross section required to fit this signal lies exactly in the allowed window for strongly interacting dark matter, in between the shielding regime of direct detection experiments and the current bounds from astrophysics and colliders.

Speaker: Hongwan Liu (Massachusetts Institute of Technology)

20190729 APS DPF 2019 - New Aspects of Millicharged Dark Matter at 21-cm.pdf

Field & String Theory

parallel sessions

Conveners: Mirjam Cvetic (University of Pennsylvania), Mirjam Cvetic (Departm.of Physics & Astronomy), Xi Yin (Harvard University)

58 Long String Scattering in c=1 String Theory

We compute scattering amplitudes for long strings in c=1 string theory and in the dual matrix model. On the worldsheet side, the long string amplitudes are obtained from the boundary conformal field theory of open strings on FZZT branes, in a limit where the branes decouple. In particular, we compute tree-level amplitudes for a long string to emit a closed string, and for the 2-to-2 scattering of long strings. These are numerically matched to computations in the adjoint and bi-adjoint sectors of the dual matrix model, thereby providing strong evidence for the duality beyond the singlet sector.

Speaker: Bruno Balthazar (Harvard University)

ZZinsttalk_3.pdf

59 Strings in Ramond-Ramond (RR) Backgrounds from the Neveu-Schwarz-Ramond (NSR) Formalism

In contrast to the fact that there are many interesting solutions to supergravity equations of motions describing backgrounds around which we can study physics, perturbative string theoretic approach to such backgrounds was mostly limited to special cases. In particular, it is commonly believed that the NSR formalism of perturbative string theory has limitations in describing type II strings in RR background. In this talk, I discuss how we can systematically describe RR flux backgrounds in the framework of closed superstring field theory based on the NSR formalism, and present two applications of the framework: the pp-wave background supported by 5-form flux and AdS3xS3 supported by mixed 3-form fluxes.

Speaker: Minjae Cho

RRSFT.pdf

60 A Quadrillion Standard Models from F-theory

We present an explicit construction of $\mathcal{O}(10^{15})$ globally consistent string compactifications that realize the exact chiral spectrum of the Standard Model of particle physics with gauge coupling unification in the context of F-theory. Utilizing the power of algebraic geometry, all global consistency conditions can be reduced to a single criterion on the base of the underlying elliptically fibered Calabi--Yau fourfolds. For toric bases, this criterion only depends on an associated polytope and is satisfied for at least $\mathcal{O}(10^{15})$ bases, each of which defines a distinct compactification.

Speaker: Mr Jiahua Tian (Northeastern University)

QuadrillionSM.pdf

61 Bootstrapping Inflationary Correlators

The central idea of the bootstrap approach is to constrain observables directly from consistency conditions, eschewing the complexity of the Lagrangian formalism. In this talk, I will adopt this viewpoint and discuss how the structure of correlation functions in inflation is controlled by (approximate) conformal symmetry and singularities, focusing on three- and four-point functions at tree level. In particular, I will describe classes of differential operators that shift the masses and spins of external/internal particles, allowing general inflationary correlators to be written in terms of a few seed functions. I will also highlight spectroscopic signatures encoded in these correlators, which can be searched for in future cosmological observations.

Speaker: Hayden Lee

APS_Northeastern.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

62 Measurement of The Neutron Cross Section on Argon by the Mini-CAPTAIN Detector

The CAPTAIN (Cryogenic Apparatus for Precision tests of Argon Interactions with Neutrinos) experiment’s goal is to measure the neutron cross section and define the neutron signature in liquid argon in the 50 MeV to 800 MeV energy range. This measurement is of great interest for neutrino physics since neutrons introduce a considerable uncertainty in neutrino energy reconstruction. They take away a portion of energy with almost no possibility to reconstruct it due to luck of charge. In particular, data provided by the CAPTAIN collaboration will serve the needs of the planned experiment DUNE (Deep Underground Neutrino Experiment), which will be a neutrino oscillation experiment using a Liquid Argon detector. The Mini-CAPTAIN detector, a 400-kg instrumented mass LArTPC, is used to measure the cross section of neutron interactions on an argon target. The CAPTAIN collaboration successfully collected neutron data using the Mini-CAPTAIN detector in July 2017 at the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL). In this talk I will report results of the analysis of data from the July 2017 neutron run.

Speaker: Mr Sergey Martynenko (Ph.D Student, Stony Brook University)

First_Measurement_of_the_Neutron_Cross_Section_on_Liquid_Argon_Between_100_and_800_MeV_Martynenko.pdf

63 Elastic neutrino-electron scattering within the effective field theory approach

Elastic neutrino-electron scattering provides an important tool for normalizing neutrino flux in modern experiments. This process is subject to large radiative corrections. We determine the Fermi effective theory performing the one-loop matching to the Standard model at the electroweak scale with subsequent running down to GeV scale. Based on this theory, we analytically evaluate virtual corrections and distributions with one radiated photon beyond the electron energy spectrum. We discuss the relevance of radiative corrections depending on conditions of modern accelerator-based neutrino experiments.

Speaker: Dr Oleksandr Tomalak (University of Kentucky)

talk_Oleksandr_Tomalak_DPF_2019.pdf

64 Removal Energies and Optical Potential in Lepton Nucleus Scattering

We investigate the binding energy parameters that should be used in modeling electron and neutrino scattering from nucleons bound in a nucleus within the framework of the impulse approximation. We discuss the relation between binding energy, missing energy, removal energy ($\epsilon$), spectral functions and shell model energy levels and extract updated removal energy parameters from ee$^{\prime}$p spectral function data. We address the difference in parameters for scattering from bound protons and neutrons. We also use inclusive e-A data to extract an empirical parameter
$U_{FSI}( (\vec q_3+\vec k)^2)$ to account for the interaction of final state nucleons (FSI) with the optical potential of the nucleus. Similarly we use $V_{eff}$ to account for the Coulomb potential of the nucleus. With three parameters $\epsilon$, $U_{FSI}( (\vec q_3+\vec k)^2)$ and $V_{eff}$ we can describe the energy of final state electrons for all available electron QE scattering data. The use of the updated parameters in neutrino Monte Carlo generators reduces the systematic uncertainty in the combined removal energy (with FSI corrections) from $\pm$ 20 MeV to $\pm$ 5 MeV.

Speaker: Mr Tejin Cai (University of Rochester)

BindingEnergyTalk.pdf

65 Nucleon Binding Energy and Transverse Momentum Imbalance in Neutrino-Nucleus Reactions

The binding energy of nucleons from nuclei in neutrino-nucleus interactions is constrained by analyses of $(e,e^\prime p)$ reactions in electron scattering experiments and theoretical corrections for differences between electron and neutrino induced reactions. Different neutrino interaction generators implement these constraints in distinct ways, and the resulting differences in predictions are significant for current and next generation precision neutrino oscillation experiments. We show that projections of the transverse momentum imbalance between the lepton and proton in mesonless charged current neutrino interaction events are sensitive to the removal energy, Fermi motion, and final-state interactions. We compare simulations from interaction generators to the MINERvA measurements of these projections in neutrino events on hydrocarbon at $\langle E_\nu\rangle=3$ GeV.

Speaker: Mr Tejin Cai (University of Rochester)

TransverseAnalysisTalk2.pdf

66 Measurements of Charged-Current Muon-Neutrino interactions on Argon at MicroBooNE

The MicroBooNE experiment studies neutrino interactions with a Liquid Argon Time Projection Chamber (LArTPC) as part of the Short Baseline Neutrino program at Fermilab. The MicroBooNE detector, located on-axis in the Booster Neutrino Beam, has an active volume of 85 tonnes of Liquid Argon and a single 2.5 m wide drift. This talk will present the differential cross-section measurement for charge-current muon-neutrino-Ar interactions with an inclusive selection, the cross-section for charge-current neutral pion production, and recents results for charge-current interactions with protons in the final selection. The data from as much as 1.6E20 protons on target is compared with various theoretical models for neutrino interactions on Argon and the potential for tuning or discriminating models is discussed.

Speaker: Michael Kirby (Fermi National Accelerator Laboratory)

MicroBooNE_Cross_Sections_DPF2019.pdf

67 High statistics results on quasi-elastic-like neutrino scattering from MINERvA

We present the MINERvA experiment’s new double-differential scattering cross sections for neutrinos on scintillator from our recently completed data taking run with a medium energy tune relevant to the NOvA and DUNE oscillation experiments. These results have 10 times the statistics of our previously reported results. As well as being useful to help reduce oscillation experiments' uncertainty, our data can also be used to study the prevalence of various correlation and final-state interaction effects within the nucleus. We compare to models produced by different model generators, and are able to draw improved conclusions about the predictions of these models.

Speakers: Mateus Carneiro (Oregon State University), Amit Bashyal (Oregon State University)

DPF_August_2019_ver5p3.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

68 The Innovative Design of the Endcap Disc DIRC for PANDA at FAIR

The future PANDA experiment at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt (Germany) is a fixed-target experiment for collisions of antiprotons with a proton target up to a beam momentum of 15 GeV/c and designed to address a large number of open questions in the hadron physics sector. In order to guarantee an excellent Particle Identification (PID) for charged hadrons in the polar angle range between $5^\circ$ and $22^\circ$, a new type of Cherenkov detector has been developed for the forward endcap of the PANDA target spectrometer. It is based on the principle of Detection of Internally Reflected Cherenkov Light (DIRC) and therefore called Endcap Disc DIRC (EDD). The desired separation power of at least 3 standard deviations for the separation of $\pi^\pm$ and $K^\pm$ up to particle momenta of 4 GeV/c was determined with simulation studies and validated during various testbeam campaigns at CERN and DESY.

The EDD consists of four independent radiator quadrants, made of synthetic fused silica, and uses the principle of internal reflection to propagate the created Cherenkov photons to the outer rim where they enter one of 96 Readout Modules (ROMs) which are glued to the radiator. The surfaces of each quadrant are highly polished in order to reduce possible photon losses and to conserve the Cherenkov angle during the reflections at the surface. After focusing the captured photons to the photocathode of attached Multichannel Plate Photomultiplier Tubes (MCP-PMTs), the Cherenkov angle can be calculated from the hit position and time information with dedicated, fast reconstruction algorithms. Additionally, the trajectory information of the charged particle has to be taken into account.

This talk will cover the detector instrumentation and the designed framework for the detector simulation and reconstruction. Furthermore, the simulation results, used to optimize the detector performance, and the latest testbeam analysis for validating these results will be presented. The PID performance has been evaluated by simulating the specific decay channel $\bar p p \rightarrow f_0\pi^0 \rightarrow \pi^+ \pi^- \pi^0$ including the glueball candidate $f_0(1500)$. In addition to that, a prototype for an online event reconstruction on a Virtex-4 FPGA card has been develeoped and will be introduced in this talk.

Speaker: Mustafa Andre Schmidt (Justus-Liebig-Universitaet Giessen (DE))

20190727_DPF2019_Mustafa.pdf

69 ATLAS Run-2 Luminosity Measurements

During the LHC Run-2 operations ATLAS gathered a total of $139~fb^{-1}$ of $pp$ collision data at a center-of-mass energy of $\sqrt{s}=13~$TeV. The uncertainty on the measurement of the total integrated luminosity, $1.7\%$, is the dominant uncertainty for a number of analyses. A precise luminosity measurement is therefore of high importance. In this talk, we provide a description of the methodology of the measurement of the total integrated luminosity and its associated uncertainty. Special attention is given to improvements made compared to Run-1 and an overview of the relevant sub-detectors is provided. The use of Van-der-Meer beam-separation scans in calibrating the luminosity is also detailed.

Speaker: Rachel Christine Rosten (The Barcelona Institute of Science and Technology (BIST) (ES))

2019_07_29_ATLAS_Lumi.pdf

70 Results and prospects with the CMS-TOTEM Precision Proton Spectrometer

The PPS (Precision Proton Spectrometer) detector system consists of silicon tracking stations as well as timing detectors to measure both the position and direction of protons and their time-of-flight with high precision. They are located at around 200 m from the interaction point in the very forward region on both sides of the CMS experiment. PPS is built to study Central Exclusive Production (CEP) in proton-proton collisions at the LHC, including the photon-photon production of W and Z boson pairs, high-mass diphoton and dilepton production, high-$p_T$ jet production, as well as searches for anomalous couplings and new resonances. The PPS detector has taken data at high luminosity while fully integrated to the CMS experiment. The total data collected correspond to around 100 ${\rm fb}^{-1}$ during the LHC Run 2. In this presentation the PPS operation, commissioning and performance are discussed. We will also present the first results and the physics prospects from the CMS Precision Proton Spectrometers, in particular the observation of exclusive dileptons at high mass with 10 ${\rm fb}^{-1}$ of data accumulated in 2016. This result shows a good understanding, calibration and alignment of the new PPS detectors.

Speakers: Finn O'Neill Rebassoo (Lawrence Livermore Nat. Laboratory (US)), Finn O'Neill Rebassoo (Lawrence Livermore Nat. Laboratory (US))

2019_07_29_DPF_FinnRebassoo.pdf

71 The Physics of Precision Timing in CMS using the MIP Timing Detector

As part of the Phase II upgrade program for HL-LHC, the CMS Detector will be instrumented with a new precision timing layer (the MIP Timing Detector), dedicated to providing timing information (with resolution of ~30-40 ps) for charged particles. This upgrade will reduce the effects of pile-up expected at the HL-LHC and will bring new and unique capabilities to the CMS detector. We will discuss precision timing as a pathfinder for new physics in both the multi-TeV and low energy ranges. In this context, we will present prospects for long-lived particles in various BSM theoretical models and low energy precision particle identification, for example in the Higgs and heavy flavor sectors. An overview of the instrumentation challenges for precision timing systems at the HL-LHC will be discussed. The talk also will discuss performance as a function of precision and applications of precision timing beyond collider physics.

Speaker: Si Xie (California Institute of Technology (US))

20190729_DPFMeeting_MTDPhysics.pdf

72 Development of Crystal+SiPM Sensors for the CMS MTD Barrel Timing Layer

As part of the CMS Phase II Upgrade, a new MIP Timing Detector (MTD) will measure minimum ionizing particles with a time resolution of ~30-40 ps and hermetic coverage up to a pseudo-rapidity of |η|=3. The central Barrel Timing Layer (BTL) will be based on LYSO:Ce crystals read out with SiPMs. The BTL will use elongated crystal bars with double-sided read out, with a SiPM on each end of the crystal, in order to maximize detector performance within the constraints of space, cost, and channel count. This unusual geometry enables the instrumentation of large surfaces while minimizing the active area of the photodetectors, and thus noise and power consumption. We will present the extensive R&D studies carried out to optimize the MTD BTL crystal-based technology and will present recent test beam results.

Speaker: Benjamin Tannenwald (University of Virginia (US))

tannenwald_BTL_DPF_08-2019_v3.pdf

73 Precision Timing with the CMS Endcap Timing Layer for Phase 2

The MIP Timing Detector (MTD) of the Compact Muon Solenoid (CMS) is designed to provide precision timing information (with resolution of ~40 ps) for charged particles (MIPs), with hermetic coverage up to a pseudo-rapidity of |η|=3. The endcap region of MTD, called the Endcap Timing Layer (ETL), covers the high radiation pseudo-rapidity region between |η|=1.6 and 3.0. We present an overview of the MTD ETL design and report on status of the R&D for the MTD ETL.

Speaker: Ryan Heller (Fermi National Accelerator Lab. (US))

heller_MTDETL_DPF19.pdf

74 Characterization of Low Gain Avalanche Detectors for the CMS MIP Timing Detector

The endcap portion of the CMS MIP Timing Detector (MTD), denoted the Endcap Timing Layer (ETL), will be instrumented with silicon-based low gain avalanche detectors (LGADs). We present the status of recent R&D efforts for LGADs, with a focus on sensor characterization from bench tests and dedicated test beams, and including studies of time resolution, geometry, doping, and uniformity, along with a discussion of future plans.

Speaker: Andres Abreu Nazario (The University of Kansas (US))

DPF2019.pdf

QCD & Heavy Ions

parallel sessions

Conveners: Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

75 Critical Point through the random fluctuation walk

The critical phenomena of strongly interacting matter are presented in the random fluctuation walk model. The phase transitions are considered in systems where the Critical Point (CP) is a distinct singular one existence of which is dictated by the dynamics of conformal symmetry breaking.
The physical approach to the effective CP is predicted through the influence fluctuations of two-particle quantum correlations to which the critical mode couples. The finite size scaling effects are used to extract the vicinity of CP and deconfinement phase transition.
We conclude that the size of the particle emission source is affected by the stochastic forces in thermal medium characterized by the Ginzburg-Landau parameter. The latter is defined by the correlation length of characteristic dual gauge field. The particle source size blows up when the temperature approaches the critical value as correlation length becomes large enough.
The results are the subject to the physical programs at accelerators to search the hadronic matter produced at extreme conditions.

Speaker: Prof. Gennady Kozlov (JINR)

Kozlov_CP & RFW_2019_1.pdf

76 Critical point and primary direct photons

The critical point in particle physics at high temperature is studied through the ideal gas of scalars, the dilatons, in the model that implies the spontaneous breaking of an approximate scale symmetry. The dynamical system of identical particles weakly interacting to each other is considered. We found the critical temperature as a function of a dilaton mass, and the fluctuation of particle density grows up very sharply at critical point. Our results also suggest that the critical point may be identified through the fluctuation in yield of primary photons induced by conformal anomaly of strong and electromagnetic sectors.

Speaker: Dr Gennady Kozlov (JINR)

Kozlov_CP&Primary Photons_2019_1.pdf

77 Contribution of the Initial geometry state fluctuations to the ridge structure in high multiplicity pp collisions

One of the key signatures of collectivity in heavy-ion collisions is the appearance of a ridge structure over wide pseudorapidity interval. Recently it was also found in small collision systems such as proton-proton or proton-ion collisions which origin is still on debate. In this work, contributions from the geometry fluctuations in the initial-state in pp collisions to the ridge structure are estimated from low to high density in the framework of clustering of color strings. Effects show to be relevant for small collision systems unlike in heavy-ion collisions where their effects are negligible.

Speaker: Irais Bautista Guzman (Autonomous University of Puebla (MX))

APSIBautista.pdf

78 Quantum Information Science in Proton-Proton Collisions at the Energy Frontier

The observed thermalization in particle production at colliders,
usually inferred from the presence of the exponential component in
the transverse momentum distributions of produced particles and the
thermal abundances of the hadron yields, is proposed as due to quantum
entanglement inside the proton wave functions in the proton-proton
collisions. This presentation will show our analysis results of the
transverse momentum distributions, and conclusions in the following
proton-proton collision processes, all at 13 TeV collision energy:
(i) inclusive inelastic pp collisions; (ii) single- and double-diffractive
Drell-Yan production pp → μ+μ−X; and (iii) Higgs boson production.
Given our results, the wealth of new LHC data, and ongoing efforts,
this is shown to be an exciting research area at the interface of
QIS and HEP.

Speaker: Ridge Liu (Yale University)

Quantum Information Science in pp Collisions.pdf

Quantum Information Science in pp Collisions.pptx

79 Exotic Charmonium at BESIII

The BESIII Experiment at the Beijing Electron Positron Collider (BEPC2) collected large data samples for electron-positron collisions with center-of-mass above 4 GeV. The analysis of these samples has resulted in a number of surprising discoveries, such as the discoveries of the electrically charged "Zc" structures, which, if resonant, cannot be accommodated in the traditional charm quark and anti-charm quark picture of charmonium.In this talk, we will review the current status of the analyses of the exotic states, as well as a number of other interesting features in the new BESIII data samples.

Speakers: Ilaria Balossino (INFN Ferrara), Ilaria Balossino (INFN Fe - IHEP)

DPF_Exotics_ILARIA.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

80 Lepton Flavor Violation

In this talk we show how $\tau$ decays offer an interesting possibility to discriminate between different operators contributing to lepton flavor violation
discussed within an effective field theory framework. Recent developments in the determination of the hadronic matrix elements needed to consider semileptonic decays are reviewed. We also discuss the complementarity with other probes such as the ones involving muons.

Speaker: Emilie Passemar (Indiana University/JLab)

EPassemar_DPF2019.pdf

81 The MEG II experiment in search of mu -> e gamma

The tiniest upper limit of any particle's branching ratio was established in 2016 by the MEG experiment on the lepton-flavor-violating muon decay, $\mu \to e \gamma$. To further explore the existence of the decay with an order of magnitude higher sensitivity, the detectors have been upgraded. The new experiment, MEG II, is going to start data-taking in 2020 at the Paul Scherrer Institute in Switzerland. The commissioning and performance of the detectors will be presented, and the status and prospect will be discussed.

Speaker: Yusuke Uchiyama (The University of Tokyo)

APS-DPF2019.pdf

82 A Search for the Neutrinoless Conversion of Muons to Electrons with the Mu2e Experiment

The primary physics goal of the Mu2e Experiment is to search for Charged Lepton Flavor Violation (CLFV) in the process of a coherent neutrinoless $\mu^{-} N \rightarrow e^{-} N$ transition. This process is allowed under the Standard Model however at unobservable rates. Observation of this process would therefore be an unambiguous indication of new physics. The Mu2e goal is to improve on the existing experimental sensitivity by four orders of magnitude. Mu2e is in the construction phase at Fermilab. We discuss briefly the experimental approach, status of the Project, and future prospects of this search.

Speaker: Dr Yaqian Wang (Mainz University)

YaqianWang_Mu2e.pdf

83 A PIP-II Mu2e Experiment

We will investigate an alternative Mu2e-II production scheme based on general knowledge of muon-collider and neutrino-factory front ends, and specific knowledge developed on previous Muons, Inc. SBIR/STTR projects. Bright muon beams generated from sources designed for muon collider and neutrino factory facilities have been shown to generate two orders of magnitude more muons per proton than the current Mu2e production target and solenoid. In contrast to the current Mu2e, the muon collider design has forward-production of muons from the target. Forward production from 8 GeV protons would include high energy antiprotons, pions and muons, which would provide too much background for the Mu2e system. In contrast, the 800 MeV PIP-II beam does not have sufficient energy to produce antiprotons, and other secondaries will be at a low enough energy that they can be ranged out with an affordable shield of ~ 2 meters of concrete.

Speaker: Prof. Mary Anne Cummings (Muons, Inc.)

Cummings_PIP_II_Mu2e.pdf

84 The Fermilab Muon g-2 straw tracking detectors and the muon EDM measurement

The Fermilab Muon g-2 experiment will measure the anomalous magnetic moment of the muon to a precision of 140 parts per billion, which is a factor of four improvement over the previous E821 measurement at Brookhaven. The experiment will also extend the search for the muon’s electric dipole moment (EDM) by approximately two orders of magnitude with a sensitivity down to 10e-21 e.cm. Both of these measurements are made by an analysis of the modulation of the decay rate of the higher-energy positrons from the (anti-)muon decays recorded by 24 calorimeters and 2 straw tracking detectors. The straw tracking detectors are used to cross-calibrate the calorimeter, identify pileup and muons lost from the storage region, and to measure the beam-profile. A tracker measurement of the up-down modulation of positrons will be used in the EDM analysis.

In this talk, the design of the straw tracking detector and its performance evaluated from an analysis of the 2018/19 g-2 data will be described. The role the detector has in determining the systematic uncertainty in the measurement of g-2 arising from the beam motion and the beam’s momentum and spatial variance will be described and compared with simulation.

Speakers: Gleb Lukicov (Fermi National Accelerator Laboratory), Gleb Lukicov (University College London)

APS_DPF_Gleb_Lukicov_compressed.key

APS_DPF_Gleb_Lukicov_compressed.pptx

APS_DPF_Gleb_Lukicov.pdf

85 Leading order hadronic vacuum polarization contribution to the muon anomalous magnetic moment from the FNAL/HPQCD/MILC collaborations

The Muon $g-2$ experiment at Fermilab is set to provide the most precise measurement of the anomalous magnetic moment of the muon. There is currently a 3+ $\sigma$ tension between the experimental value and Standard Model theory, making this a promising way to look for evidence of beyond the standard model physics. The hadronic vacuum polarization (HVP) contribution to muon $g-2$ is the largest source of theoretical error. This talk will describe latest results for the leading order HVP contribution based on lattice QCD from the Fermilab Lattice, HPQCD, and MILC Collaborations.

Speaker: Steven Gottlieb (Indiana University)

Gottlieb_gm2_dpf.pdf

DOE: DOE PI Meeting: Budget/Early Career/Cross-cut topics

Convener: Michael Cooke (U.S. Department of Energy)

86 Communicating Science with Impact

Speaker: Allison Eckhardt

2019-07-29 Communicating Science with Impact.pdf

acknowledgement one pager.pdf

87 DOE PI Meeting

Speaker: Michael Cooke (U.S. Department of Energy)

2019-07-29 DOE HEP Budget, Early Career, Diversity and Inclusion.pdf

Tuesday, 30 July

Plenary Sessions: Tuesday Morning 1

Convener: Rafael Lang

88 Axion DM Searches

Speaker: Lindley Winslow (Massachusetts Institute of Technology)

Conference_Winslow_DPF2019.pdf

89 Models of Dark Matter & Dark Sectors

Speaker: Natalia Toro (SLAC)

Toro DPF 2019 DM theory.pdf

90 Dark Matter: Direct Detection

We have a big problem in understanding the most abundant mass content in the Universe: dark matter. Despite several decades of experimental effort with hundreds of million dollars of investment, there is still no observation of direct interaction of dark matter with sensitive detectors at deep underground labs worldwide. Are we going to hit the unavoidable neutrino background soon? Shall we look for heavy or light dark matter? I will review the most recent results from dark matter direct detection experiments and discuss some new efforts that have the potential to break the silence in the next few years.

Speaker: Kaixuan Ni

DarkMatterDetection-Review-DPF2019.pdf

91 Dark Matter: Indirect Detection

Speaker: Kerstin Perez (MIT)

KPerez_APSDPF_20190830.pdf

92 Dark Matter: Astrophysical Probes

Speaker: Alex Drlica-Wagner (Fermilab)

ADW-DM-DPF2019.pdf

10:30 Coffee Break

Plenary Sessions: Tuesday Morning 2

Convener: Marcelle Soares-Santos (Brandeis University)

93 New Measurements of Cosmological Parameters

Speaker: Jonathan Blazek (EPFL/OSU)

Blazek Cosmology DPF 2019

Blazek_cosmology_DPF2019.key

Blazek_cosmology_DPF2019.pdf

94 Astrophysical Evidence on Heavy & Light Dark Species

Speaker: Annika Peter (Ohio State University)

dpf2019_peter.pptx

95 High Energy Astroparticles

Speaker: Tyce DeYoung (Michigan State University)

DeYoung_DPF_2019.pdf

96 DPF2019 Tues Remarks

Speakers: Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

Day2_remarks_v2.pdf

Lunch Time Sessions: Education & Outreach: Communications Workshop

Conveners: Kevin Pitts (University of Illinois), kathryn jepsen (Stanford University)

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US)), stefania gori (UC Santa Cruz)

97 Revisiting the Dark Photon Interpretation of the Muon Anomalous Magnetic Moment

A massive U(1)′ gauge boson known as a “dark photon” or A′, has long been proposed as a potential explanation for the discrepancy observed between the experimental measurement and theoretical determination of the anomalous magnetic moment of the muon ($g_μ$ − 2) anomaly. Recently, experimental results have excluded this possibility for a dark photon exhibiting exclusively visible or invisible decays. In this work, we revisit this idea and consider a model where A′ couples inelastically to dark matter and an excited dark sector state, leading to a more exotic decay topology we refer to as a semi-visible decay. We show that for large mass splittings between the dark sector states this decay mode is enhanced, weakening the previous invisibly decaying dark photon bounds. As a consequence, A′ resolves the $g_μ$ − 2 anomaly in a region of parameter space the thermal dark matter component of the Universe is readily explained. Interestingly, it is possible that the semi-visible events we discuss may have been vetoed by experiments searching for invisible dark photon decays. A re-analysis of the data and future searches may be crucial in uncovering this exotic decay mode or closing the window on the dark photon explanation of the $g_μ$ − 2 anomaly.

Speaker: Gopolang Mohlabeng (Brookhaven National Laboratory)

IDM_DP_g2_DPF.pdf

98 Magnetic Field Measurement and Analysis for the Muon g-2 Experiment

The Muon g-2 Experiment (E989) at Fermilab measures the anomalous magnetic moment of the muon $a_{\mu}$, aiming at resolving the 3.6-$\sigma$ discrepancy between the previous measurement and the Standard Model calculation with a improved precision of 140 part-per-billion (ppb). In E989, the muon beam is stored in a ring magnet. The spin precession frequency $\omega_{a}$ is measured by counting the decay positrons in 24 calorimeters, and the magnetic field is measured by nuclear magnet resonance (NMR) probes. An in-vacuum field scanning system consisting of NMR probes and read-out electronics was implemented to measure the magnetic field applied to the muon beam. An additional 378 NMR probes placed at fixed locations outside the vacuum chamber monitor the field drift in between scans. Another high-accuracy probe was designed for calibrating the probes in the scanner. In this presentation, the magnetic field measurement hardware system and analysis methods will be described in detail. The progress of the Run-1 data analysis and improvements in Run-2 will also be presented.

Speaker: Dr Ran Hong (Argonne)

G2Field_DPF2019.pptx

G2Field_DPF2019_single_slides.pdf

99 Mixed hidden sector/visible sector dark matter and observation of CP odd Higgs at HL-LHC and HE-LHC

It is very likely that similar to the case of visible matter, dark matter too is composed of more than one stable component. In this work we investigate a two-component dark matter with one component from the visible sector and the other from the hidden sector. Specifically we consider a $U(1)_X$ hidden sector extension of MSSM/SUGRA where we allow for kinetic and Stueckelberg mass mixing between the two abelian $U(1)'s$, i.e., $U(1)_X$ and $U(1)_Y$. We further assume that the hidden sector has chiral matter which leads to a Dirac fermion as a candidate for dark matter. The lightest neutralino in the visible sector and the Dirac fermion in the hidden sector then constitute the two components of dark matter. We investigate in particular MSSM/SUGRA models with radiative breaking occurring on the hyperbolic branch where the Higgs mixing parameter $\mu$ is small (order the electroweak scale) which leads to a lightest neutralino being dominantly a higgsino. While dark matter constituted only of higgsinos is significantly constrained by data on dark matter relic density and by limits on spin independent proton-DM scattering cross section, consistency with data can be achieved if only a fraction of the dark matter relic density is constituted of higgsinos with the rest coming from the hidden sector. An aspect of the proposed model is the prediction of a relatively light CP odd Higgs $A$ (as well as a CP even $H$ and a charged Higgs $H^{\pm}$) which is observable at HL-LHC and HE-LHC. We perform a detailed collider analysis search for the CP odd Higgs using boosted decision trees in $\tau_h\tau_h$ final states and compare the discovery potential at HL-LHC and HE-LHC. We show that while several of the points among our benchmarks may be observable at HL-LHC, all of them are visible at HE-LHC with much lower integrated luminosities thus reducing significantly the run time for discovery. Thus the discovery of a CP odd Higgs would lend support to the existence of the hyperbolic branch, a small $\mu$ and point to the multi-component nature of dark matter. It is also shown that a part of the parameter space of the extended model can be probed in the next generation direct detection experiments such as XENONnT and LUX-ZEPLIN.

Speaker: Amin Aboubrahim (Northeastern University)

hsCP_dpf_2019.pdf

100 Exploration of the dark sector with the Fermilab dimuon experiment

Searches for dark-matter particles at the GeV mass scale have been
receiving much attention in the last several years, partly motivated
by the failure of direct and indirect searches of heavier candidates
to produce a signal. The SpinQuest dimuon experiment in the 120-GeV
Main-Injector proton beam at Fermilab, currently in the commissioning
stage, is uniquely equipped to search for dark photons and dark Higgs
particles produced in a 5-m long iron beam dump with masses in the
range 0.2 - 10 GeV, running in a parasitic mode. This only requires
a modest upgrade of a displaced-vertex trigger with acceptance for
dark-sector particles decaying into dimuons inside or downstream of
the dump. We discuss the physics reach of such a run, the status,
and some additional future prospects.

Speaker: Vassili Papavassiliou (New Mexico State University)

DarkPhoton.pdf

101 A Portalino to Twin Sector— Cosmology and Flavor Physics

Extensions of the Standard Model are often highly constrained by cosmology. The presence of new states can dramatically alter observed properties of the universe by the presence of additional matter or entropy. In particular, attempts too solve the hierarchy problem through naturalness invariably predict new particles near the weak scale which come into thermal equilibrium. Without a means to deposit this energy into the SM, these models are often excluded. Scenarios of ``neutral naturalness'' especially, such as the Twin Higgs frequently suffer from this.

However, the Portalino, a singlet fermion that marries gauge neutral fermion operators, can naturally help provide a portal for entropy to return to the SM and to lift fermionic degrees of freedom in the Twin Sector. Together with spontaneous breaking of the $Z_2$ ${\rm SM \leftrightarrow {\rm Twin}}$ symmetry, there are new opportunities to confront the cosmological challenges of these models.

Here, we attempt to develop such ideas. We shall show how one can lift many of the light fields by breaking $Z_2$ with a $U(1)_Y$ scalar and its Twin partner. The introduction of Portalinos can lift the remaining degrees of freedom. We shall find that such models are highly constrained by precision SM measurements, motivating moderate extensions beyond this. We will discuss two, one with additional weak matter and another with additional colored matter. The weak model will involve simple two Higgs doublet models on top of $Z_2$ breaking. The strong model will involve the presence of new leptoquarks and diquarks. We will discuss the implications for neutrino masses from radiative corrections, g-2, electron-muon transition rate and possible colored signals even within these models of neutral naturalness, some of which might appear at the LHC or future colliders. The e-print of this work is referred as arXiv:1905.00861.

Speaker: Di Liu (New York University)

APS_2019.pdf

Computing, Analysis Tools, & Data Handling

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Peter Onyisi (University of Texas at Austin (US))

102 COFFEA - Columnar Object Framework For Effective Analysis

The COFFEA Framework provides a new approach to HEP analysis, via columnar operations, that improves time-to-insight, scalability, portability, and reproducibility of analysis. It is implemented with the Python programming language and commodity big data technologies such as Apache Spark and NoSQL databases. To achieve this suite of improvements across many use cases, COFFEA takes a factorized approach, separating the analysis implementation and data delivery scheme. All analysis operations are implemented using the NumPy or awkward-array packages which are wrapped to yield user code whose purpose is quickly intuited. Various data delivery schemes are wrapped into a common front-end which accepts user inputs and code, and returns user defined outputs. We will present published results from analysis of CMS data using the COFFEA framework along with a discussion of metrics and the user experience of arriving at those results with columnar analysis.

Speaker: Nick Smith (Fermi National Accelerator Lab. (US))

ncsmith-dpf2019-coffea.pdf

103 Combined Neyman-Pearson Chi-square: an improved approximation to the Poisson-likelihood chi-square

We present a new method to approximate the widely-used Poisson-likelihood chi-square using a linear combination of Neyman's and Pearson's chi-squares, namely ``combined Neyman-Pearson chi-square'' (CNP). Through analytical derivation and toy model simulations, we show that CNP leads to a significantly smaller bias on the best-fit normalization parameter compared to that using either Neyman's or Pearson's chi-square. When the computational cost of using the Poisson-likelihood chi-square is high, CNP provides a good alternative given its natural connection to the covariance matrix formalism.

Speaker: Dr Xiangpan Ji (Brookhaven National Lab)

CNP_XiagnpanJi.pdf

104 pyhf: a pure Python statistical fitting library from the high energy physics community with tensors and autograd

The HistFactory p.d.f. template $\href{https://cds.cern.ch/record/1456844}{\text{[CERN-OPEN-2012-016]}}$ is per-se independent of its implementation in ROOT and it is useful to be able to run statistical analysis outside of the ROOT, RooFit, RooStats framework. pyhf is a pure-python implementation of that statistical model for multi-bin histogram-based analysis and its interval estimation is based on the asymptotic formulas of "Asymptotic formulae for likelihood-based tests of new physics" $\href{https://arxiv.org/abs/1007.1727}{\text{[arxiv:1007.1727]}}$. pyhf supports modern computational graph libraries such as TensorFlow and PyTorch in order to make use of features such as auto-differentiation and GPU acceleration.

Speaker: Giordon Holtsberg Stark (University of California,Santa Cruz (US))

20190729_DPF2019_pyhf.pdf

105 Extending RECAST for truth-level analysis reinterpretations

RECAST is an analysis reinterpretation framework; since analyses are often sensitive to a range of models, RECAST can be used to constrain the plethora of theoretical models without the significant investment required for a new analysis. However, experiment-specific full simulation is still computationally expensive. Thus, to facilitate rapid exploration, RECAST has been extended to truth-level reinterpretations, interfacing with existing systems such as RIVET. To illustrate this new functionality, RECAST is used to perform a search for a generic scalar dark mediator model via t-channel production.

Speaker: Alexander Joseph Schuy (University of Washington (US))

DPF 2019 Extending RECAST to Truth-Level Reinterpretations.pdf

Cosmology & Dark Energy

parallel sessions

Conveners: Prof. Michael Troxel (Duke University), Neelima Sehgal, Dr Vivian Miranda (University of Arizona)

106 Inhomogeneous Initial Conditions and the Start of Inflation

The robustness of inflation to inhomogeneous initial conditions for matter fields and the spacetime metric is under investigation. If inflationary expansion fails to begin under sufficiently inhomogeneous initial conditions, such that inflation requires fine-tuning of its initial state to occur, then its naturalness is challenged. I will present results for the range of initial conditions which give rise to inflation, based on numerical calculations which evolve the equations of motion of the scale factor and the inflaton field coupled to its quantum fluctuations and metric perturbations through a well-defined set of nonlinear interactions in the Hartree approximation. These results address to what extent inflation can occur under inhomogeneous initial conditions for a few standard slow-roll single-field inflationary models, in calculations which include effects of back-reaction of perturbations on the background dynamics and on the perturbations themselves, and which have wide applications beyond the inflationary models I will present. We have found that significantly inhomogeneous initial conditions can have nontrivial effects on the number of efolds of inflation. In particular, the initial inhomogeneities can shift the regions of phase space that support sufficient inflation, compared to the case in which one neglects all perturbations. But we also find that there seems to be no reduction in the overall volume of phase space that yields sufficient inflation, thereby providing an interesting measure of robustness. Our findings are consistent with recent simulations involving full (3+1) numerical relativity. However, by relying on certain well-studied approximations, our numerical approach can be applied more efficiently to a wide range of models, and can track the evolution of perturbations across a wide range of scales, thereby complementing the recent numerical-relativity simulations.

Speaker: Patrick Fitzpatrick (Massachusetts Institute of Technology)

Inhomogeneous_Talk_DPF_2.pdf

Inhomogeneous_Talk_DPF.key

107 Coherent Enhancement of the Axion Decay Constant in Inflation and the Weak Gravity Conjecture

Models of axion inflation based on a single cosine potential require the axion decay constant to be super-Planckian in size. However, a super-Planckian axion decay constant is disfavored in quantum gravity and in strings, and by the weak gravity conjecture. Here we propose a coherent enhancement mechanism which can produce an effective axion decay constant which is super Planckian even if the true decay constant is sub Planckian. We discuss the utility of this mechanism for a variety of axion potentials originating in supersymmetry, supergravity, and strings. The coherent enhancement mechanism allows one to reduce an inflation model with an arbitrary potential to an effective model of natural inflation, i.e. with a single cosine, by expanding the potential near an inflationary point, and matching the expansion coefficients to those of natural inflation. We demonstrate that this approach can predict the number of e-foldings in a given inflation model without the need for numerical simulation. Further we show that the effective decay constant $f_e$ can be directly related to the spectral indices so that $f_e = M_\text{P} / \sqrt{1 - n_s - r / 4}$ where $n_s$ is the spectral index for curvature perturbations and $r$ is the ratio of the power spectrum of tensor perturbations and curvature perturbations. The current data on $n_s$ and $r$ constrains the effective axion decay constant so that $4.9 \leq f_e / M_\text{P} \leq 10.0$ at $95\%$ CL. Thus an important result of the analysis is that the effective axion decay constant has an upper limit of $\sim 10 M_\text{P}$ in units of Planck mass in axion cosmology for any potential-based model which produces successful inflation. The coherent enhancement mechanism for the generation of an effective $f_e > M_\text{P}$ while the true axion decay constant $f < M_\text{P}$ is discussed. We illustrate the coherent enhancement in globally supersymmetric models and supergravity models. We also show that $f_e$ based on inflation dynamics can be defined for non-potential-based models, and consider a Dirac-Born-Infeld model as an example. In each case, all the moduli are stabilized and the inflationary model consistent with astrophysical observations with $f_e > M_\text{P}$ and the true axion decay constant $f < M_\text{P}$ consistent with the weak gravity conjecture.

Speaker: Maksim Piskunov (Northeastern University)

CoherentEnhancement.pdf

108 Inflatinary Cosmology as a Precision Test of Quantum Mechanics

Inflation predicts that quantum fluctuations determine the large scale structure of the Universe. This raises the striking possibility that quantum mechanics, developed to describe nature at short distances, can be tested by studying nature at its most immense -- cosmology. By fully accepting the inflationary paradigm we realize this possibility. A nonlinear generalization of quantum mechanics modifies predictions for the cosmological power spectrum. Observational cosmology is sufficiently precise to place a stringent limit, $b\leq 3\times 10^{-34}$ eV, on the size of the nonlinear term.

Speaker: Dr Carl Rosenzweig (Syracuse University)

Precision test QM (latex2) Boston.pptx

109 Inflation, dark energy and dark matter in supergravity

A theoretical description of cosmological inflation,
dark energy (cosmological constant) and dark
matter in supergravity is non-trivial. I review the
standard procedures and propose the new ones
based on recent developments in supergravity theory.
Phenomenological aspects of dark matter in high-scale SUSY
breaking scenario are also briefly discussed.

P.S. Based on recent publications of myself with collaborators,
see http://inspirehep.net/search?p=find+a+ketov
P.P.S. My talk may be also suitable for Field Theory & String Theory

Speaker: Prof. Sergei V. Ketov (Tokyo Metropolitan University and Kali IPMU)

APS.pdf

110 Dark Energy as a New Base Energy Tier

The field of physics has been built on the scientific method where our greatest theories have been developed from a well-established foundation. However, so far, no derivations stemming from our current mathematics expressing our most validated theories has been able to reveal the nature of “dark” energy. It may be time to consider... What if it is impossible to derive the nature of dark energy by using our current foundational mathematics expressing our current theories? What if a new model of the universe is required; a more fundamental model to which a new "primordial" math is required? A model that starts with only one ingredient and its associated energy as the only way to reveal the nature of dark energy? Such a basic elementary model would have to be derived independently from our current mathematics and yet provide a new foundation from which to derive our current validated theories. If successful, the new math associated with this more fundamental model will define dark energy which could then be used to reveal the role dark energy plays in energy fields, gravity, general relativity, and much more.

Speaker: Dr Scott Gordon (University of Central Florida)

Dark Energy as a New Base Energy Tier - final version in PDF format.pdf

DOE: HEP Theory

Conveners: William Kilgore (Brookhaven National Lab), William Kilgore (Department of Physics)

111 DOE HEP Theory Overview

Speaker: William Kilgore (Department of Physics)

2019-07-30 HEP PI Meeting - Theory v1.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

112 Evidence against the decaying dark matter interpretation of the 3.5 keV line from blank sky observations

X-ray observations of clusters and galaxies have detected an unexplained X-ray emission line around 3.5 keV. This line has been the subject of many recent works due to its potential explanation as a product of decaying dark matter. I discuss recent work in which we exploit the fact that the Milky Way halo is as bright in dark matter decay as previous targets but has significantly reduced backgrounds. Furthermore, all X-ray observations look through the halo, so there is an abundance of available data. In particular, we used over 30 Ms of XMM-Newton observations of the ambient dark matter halo to search for evidence of this line. We report the strongest limits to-date on the lifetime of dark matter in this mass range and strongly disfavor the possibility that the 3.5 keV line originates from dark matter decay.

Speaker: Christopher Dessert (University of Michigan)

113 Dark Matter Indirect Detection with the GAPS Experiment

The General Antiparticle Spectrometer (GAPS) is a balloon-borne experiment designed to identify cosmic antinuclei, in particular antideuterons from dark matter annihilation or decay, using the uniquely characterized atomic X-rays and charged particles from the decay of exotic atoms. With such a novel detection approach, benefitting from a custom-developed large-area silicon tracker and a large-acceptance time-of-flight system, GAPS is sensitive to antideuterons with kinetic energy <0.25 GeV/nucleon, which should offer an essentially background-free region to probe various dark matter models. Additionally, one long duration balloon flight allows GAPS to collect a high-statistics antiproton spectrum in an unexplored energy range.
The first flight of GAPS is scheduled for 2021 from Antarctica. This talk will present the science impact of the GAPS experiment, while focusing on the detection principle, conceptual design, construction status and plan for initial flight.

Speaker: Mengjiao Xiao

Dark Matter Indirect Detection with the GAPS Experiment.pdf

114 Strong constraints on keV-scale sterile neutrinos with NuSTAR

A keV-scale sterile neutrino is a popular candidate for dark matter, with a decay signature of a mono-energetic photon that can be probed using X-ray telescopes. The NuSTAR X-ray observatory's wide-angle aperture for unfocused X-rays has allowed it to set world-leading limits on the decay rate of sterile neutrinos with masses 10-50 keV. I will present our constraints on the flux of new X-ray lines using 1.2 Ms of NuSTAR archival observations of the M31 galaxy, which reduce the remaining parameter space for resonantly-produced sterile neutrinos by close to one-third. I will also present our preliminary limits using ${\sim}200$ ks of dedicated high-latitude NuSTAR observations near the Galactic Center.

Speaker: Mr Brandon Roach (Massachusetts Institute of Technology)

Roach_DPF2019_NuSTAR.pdf

115 Constraining Dissipative Dark Matter Self-Interactions

Dark sector models with light or massless mediators naturally introduce elastic and dissipative self-interactions of dark matter. The heat exchange induced by the elastic scattering permits the gravothermal evolution of the halo. Through the evolution, a halo with a cuspy inner density profile develops a core first but become cuspy again at late time. We find that a mild dissipative scattering can significantly accelerate this evolution process. Constraints on the dissipative scattering cross section and the dissipated energy per collision can be inferred from the density cores of dwarf galaxies with low baryonic contents.

Speaker: Yiming Zhong (Stony Brook University)

Yiming_Zhong_DPF_2019.pdf

116 Dark Matter self-interactions in Milky Way dSphs

Milky Way dwarf spheroidal galaxies (dSphs) provide well-known challenges to the standard cold and collisionless dark matter (CDM) paradigm in relation to well-known puzzles as the too-big-to-fail problem. At the same time, the self-interacting dark matter (SIDM) scenario offers a promising solution to the putative small-scale crisis, while inheriting all the successes of CDM at large scales. In this talk we briefly review the virtues of the SIDM scenario and then focus on its predictions for the specific case of Milky Way dSphs. Most importantly, we point out the existence of an anti-correlation between the central halo density of these galaxies and their orbital pericenter distance from the Milky Way, inferred from the second data release of the Gaia survey. We highlight the importance of the anti-correlation found for Milky Way dSphs as an informative probe of the nature of dark matter and, in particular, we discuss its relevance in the context of the SIDM model.

Speaker: Mauro Valli (University of California, Irvine)

MV_SIDMdSphs_DPF_APS_19.pdf

Education & Outreach

parallel sessions

Conveners: Kevin Pitts (University of Illinois), kathryn jepsen (Stanford University)

117 Finding Your Place in Social Media

Social media is now the dominant means of communications worldwide and one of the most influential. It has also become a powerful channel for dissemination of science information and dialogue in the academic world.

This workshop will identify and explore promising models and practices for social media use in the community of physicists. It will aim to expand engagement throughout the community. Individual participation, as well as that of member institutions, will be discussed.

The workshop will explore how to develop a social media voice as part of professional science communications activity, and learning the crucial distinctions between personal, professional and institutional voice. We will talk about how to get started and how to use social media to its best advantage. Effective strategies and tactics will be discussed, and dialogue will be encouraged.

Twitter will be used as the case study model, and other social media platforms, including Facebook, Instagram and LinkedIn, will also be analyzed and discussed.

Speaker: Noel Rubinton (Brown University)

DPF Social Media Presentation v9.pdf

DPF Social Media Presentation v9.pptx

118 The African School of Fundamental Physics and Applications (ASP)

The African School of Fundamental Physics and its Applications has been established to build capacity to harvest, interpret and exploit the results of current and future physics experiments and to increase proficiency in related applications, such as theoretical physics, particle physics, nuclear physics, medical physics, Monte Carlo generators & simulations, accelerators & technology and Grid computing. The school is organized in three weeks every two years in an African country and it is based on a close interplay between theoretical, experimental, and applied physics. The participating students are selected from all over Africa. The school also offers a workshop to train high school teachers, an outreach to motivate high school pupils and a physics conference to support a broader participation of African research faculties. The duration of the school allows for networking - interactions among the participants. Support for the school comes from institutes in Africa, Europe, USA and Asia. The first school took place in Stellenbosch, South Africa on August 1-21 2010 , the second edition in Kumasi, Ghana on July 15-August 8 2012, the third edition in Dakar Senegal on August 3-23 2014, the fourth biennial school at the University of Rwanda on August 1-19 2016, and the fifth edition in Namibia on June 24-July 14 2018. The next edition of the school will take place on July 5-25, 2020 in Marrakesh, Morocco. In this talk, I will present the school and discuss plan for future editions to make the school sustainable.

Speaker: Mounia LAASSIRI (Mohammed V University)

DPF2019_MouniaLaassiri.pdf

119 Science Storytellers: A New Model for Public Engagement With Science

Science Storytellers is a new public engagement program with a simple aim: to sit elementary-aged children down to interview scientists in the manner of science journalists, and to then write about and share their stories. In a partnership between Science Storytellers and The Open Notebook and with seed funding from the Burroughs Wellcome Fund, we developed and ran the first Science Storytellers program during Family Science Days, a free public event at the 2017 AAAS Annual Meeting in Boston.

The success of this first event exceeded our wildest expectations: During the two days, over 400 kids, coached by science journalists, sat down to have conversations with scientists that lasted 10, 30, sometimes even 45 minutes. We had to pull chairs from other booths to accommodate all the kids who wanted to talk with our scientist volunteers, and many of those scientists stayed on well after the shifts they’d committed to ended. As simple as the idea for the booth seemed, it powerfully demonstrated kids’ appetite for understanding science and scientists in a more personal, individual way—and scientists’ appetite for communicating with the young people upon whom the future of science will depend.

One of our overarching goals with this program is to provide a true alternative to the deficit model of science communication and education. We aim to give a voice to kids and their families by encouraging them to ask questions of scientists that are personally relevant and meaningful, and to then share their stories. Related to this goal is another: to provide scientists a window into the questions and values among community members who are not scientists by profession. Still another goal is to break down barriers and shift the power dynamics between scientists and the public. Sitting down face to face with a scientist is a very different interaction than being in a setting where a scientist is giving a public presentation, even in a casual science cafe or festival setting. The project truly puts kids in the drivers’ seat and invites them to lead the conversation and tell others what they learned from the experience in a creative capacity. By introducing kids and their families to professional science journalists as well, we also aim to begin rebuilding public trust in the media.

We believe this program has great potential for exploring numerous questions in STEM education, communication, and engagement. Does engaging children in conversation with scientists also engage their caregivers? How might this approach also become an informal learning opportunity for adults? Does this kind of informal introduction to the work of scientists help children to develop a science identity? Does meeting science journalists and seeing how they approach their work help to build public trust in the media? This talk will offer a brief overview of Science Storytellers—its mission and goals, feedback we have received, stories from kids who have participated, and also will provide for an exchange of ideas with the audience.

Speaker: Ms Jennifer Cutraro (Science Storytellers )

APS_DPF_2019_cutraro.pdf

120 New Directions in International Masterclasses

International Masterclasses (IMC) have developed since their introduction in 2005. Masterclasses for International Day of Women and Girls in Science (IDWGS) and World Wide Data Day (W2D2) are innovations that began two years ago and are going well. With IDWGS masterclasses, a new pathway has been opened for high school girls to be encouraged in physics. W2D2 establishes new ways to bring masterclass activities directly to high school classrooms. More recently, IMC has experimented with masterclasses exclusively for university-level students. New masterclass measurements beyond those for the LHC have been developed and tested, notably the MINERvA Neutrino Masterclass, which is the first IMC offering in neutrino physics and the first based on a Fermilab experiment. In the MINERvA measurement, students are able to study interactions of a neutrino beam with carbon nuclei, using conservation of momentum to draw conclusions. Other masterclass measurements related to Belle II and medical imaging are also in the testing stage. More neutrino masterclasses are in development as well, especially for MicroBooNE. A longer-term goal is the creation of a DUNE masterclass measurement as that facility reaches the data-taking stage.

Speaker: Dr Richard Dower (Roxbury Latin School (retired))

apsdpf2019july.pdf

121 Engaging Cities with APS Science: How the APS-Division of Plasma Physics plans outreach events for their annual meeting, and what they create.

The American Physical Society Division of Plasma Physics annual meeting has a 30-year history of reaching out to local teachers, students and residents about plasmas and related science. Their current outreach includes: a day of accredited teacher workshops; a two-day physics expo of hands-on demonstrations for students; and an evening education event for the over-21 crowd. Ensuring the success of these activities requires months of preparation, involving onsite visits to each new meeting locale, collaborations with local educators, finding and enlisting national and local exhibitors, and rallying scientists and graduate students to teach workshops or staff expo booths. It’s a complex operation with many moving parts, fueled by educators and administrators collaborating from different institutions. This talk will provide an overview of APS-DPP outreach activities held in conjunction with their annual meeting, relating what the DPP education committee has learned about the dos and don'ts of organizing these education events.

Speaker: Mr Paul Rivenberg (MIT Plasma Science & Fusion Center)

Rivenberg.pdf

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University (US)), Ashutosh Kotwal (Duke University), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

122 Physics at FCC-ee

The future circular collider (FCC) study released a conceptual design report (CDR) in January 2019. An electron machine is considered as a first step (FCC-ee) with up to four detectors. FCC-ee is capable of very high luminosities in a wide center-of-mass (ECM) spectrum from 90 to 365 GeV. FCC-ee provides a clean experimental environment, produces high luminosity for precision measurements of the Higgs boson, W and Z bosons, and the top-quark. Precision searches will test the consistency of the Standard Model and push the sensitivity to new physics at high scales.

Speaker: Markus Klute (Massachusetts Inst. of Technology (US))

2019-07-30-mk-dpf.pdf

123 Status of the Circular Electron Positron Collider Project and Perspectives

After the Higgs discovery, high-precision Higgs physics measurements are the natural next step to probe the TeV-scale. Circular e+e- colliders, besides the possibility of direct discoveries, allow for precise measurements of the Higgs boson properties, as well as for collecting large samples of W and Z bosons that will significantly improve the Standard Model parameters precision, such as the W mass and the effective weak-mixing angle, and hence probe new physics.

This talk will focus on the Circular Electron Positron Collider (CEPC) proposed to be built in China. We will provide an overview of the project, as described in the Conceptual Design Report, emphasizing the physics reach, as well as the detector and accelerator designs. The R&D status towards the TDR, long-term plans, and issues such as international collaboration will also be addressed.

Speaker: Joao Barreiro Guimaraes Da Costa (Chinese Academy of Sciences (CN))

20190730-DPF-CEPC-Joao.pdf

124 The global SMEFT fit at e+e- Higgs factories: What is the role of each measurement?

The SMEFT provides a scientifically sound framework for studying the Higgs boson properties at future e+e- colliders. All the Higgs couplings can be determined in a nearly model-independent way. One very nice feature about the SMEFT formalism is that the Higgs couplings are related to not only themselves but also to W and Z couplings, guided by the SU(2)xU(1) gauge symmetries. On the other hand, since a large number of experimental observables, from LHC, LEP/SLC and future e+e-, are needed to determine the Higgs couplings in a global fit, it becomes non-trivial to understand quantitatively how the precision of each coupling or D-6 operator is affected by which of the input measurements. Remarkably, it is found that there exists an analytic way of understanding these questions. This talk will introduce this new study and provide formulas that assess the roles of different observables. The synergy between measurements at future e+e-, HL-LHC and Z-pole, as well as the role of beam polarizations, will be emphasized.

Speaker: Dr Junping Tian (The University of Tokyo)

SMEFTatee_DPF2019.pdf

125 Higgs exotic decays at e+e- Higgs factories

New physics may well be linked to the SM sector via the Higgs portal. Hence the Higgs boson property measurements, including precision as well as exotic decays may provide new insight into the BSM physics. In this talk, I will discuss the Higgs width measurement through new interference effect and Higgs exotic decay sensitivities at future e+e- collider Higgs factories.

Speaker: Zhen Liu (U of Maryland)

15-DPF19_HiggsExotic_ZhenLiu.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

126 Sterile Neutrino Global Fits

This talk presents results of fits of sterile neutrino models to short baseline oscillation data. This is motivated by a number of experiments that have observed anomalies. We report the latest 3+1 fit result, which is the model traditionally used for comparison. This model has a well-known “tension” between appearance and disappearance that we will discuss. We will then explore extensions to the 3+1 phenomenology, including introducing decay of the fourth mass state, that provide improved fits and reduced tension.

Speaker: Janet Conrad (Massachusetts Institute of Technology)

DPF_2019_v1.pdf

127 Searching for Muon Neutrino Disappearance at LSND Neutrino Energies with CCM

Although MiniBooNE and LSND experiments have shown compelling evidence for sterile neutrinos in short baseline neutrino oscillation experiments, long baseline neutrino experiments and IceCube set strong constraints on muon neutrinos oscillating at the $\sim1\,\text{eV}^{2}$ mass scale. These muon neutrino experiments are at much higher energies compared to LSND and MiniBooNE. Coherent CAPTAIN-Mills (CCM) is a new experiment operating at the Lujan Center at LANSCE that uses a 10-ton liquid argon scintillation detector to search for muon neutrino disappearance at LSND neutrino energies. An intense 100-kW, 800-MeV proton beam hitting a tungsten target at 20 Hz with a pulse width of 290 ns generates the stopped pion source. The fast pulse allows for isolating the monoenergetic muon neutrino and rejecting beam related neutrons, and increases sensitivity to accelerator-produced sub-GeV dark matter. In this talk, I will describe the CCM detector and the Lujan Center, and show first results from our successful Fall 2018 commissioning run.

Speaker: Remington Thornton (LANL)

thornton_ccm_aps_dpf_20190730.pdf

128 Sterile Neutrino Search via Neutral-Current Disappearance with Antineutrinos in NOvA

Observations of neutrino oscillations from the majority of neutrino
oscillation experiments are consistent with a three-flavor framework.
However, the excess of events seen by LSND and MiniBooNE may be
incompatible with this model and, to explain these data using neutrino
mixing, require an additional, sterile, neutrino. These intriguing results
are not conclusive and are in tension with findings from other short-
baseline and long-baseline experiments.

The NOvA experiment, which uses two functionally identical liquid
scintillator detectors over an 810 km baseline in the Fermilab NuMI beam,
has the potential to set world-leading limits on the θ24 and θ34 parameters
governing sterile neutrino oscillations by searching for a deficit of neutral
current interactions compared to that predicted at the two detectors. The
results of this analysis when applied to the full NOvA 12.3e20 POT
antineutrino dataset will be presented. Limits on the sterile neutrino
mixing parameters, the first from a long-baseline analysis with
antineutrinos, will be shown, and plans for future analyses, including a
two-detector joint fit utilizing a covariance matrix to constrain systematics,
will be discussed.

Speaker: Michael Wallbank

SterileNeutrinoSearchViaNeutralCurrentDisappearanceWithNOvA.pdf

129 Status of the ICARUS T600 Detector and its Physics Goals

ICARUS is one of three liquid argon time projection chambers (LArTPCs) of the Short-Baseline Neutrino (SBN) Program at FNAL. SBN’s purpose is to address the observed neutrino measurement anomalies seen by experiments such as LSND and MiniBooNE, and the potential existence of sterile neutrinos. ICARUS underwent an overhaul at CERN and has now been transferred to FNAL where ICARUS will serve as the far detector in a physics run for the SBN Program. ICARUS resides in the Booster Neutrino Beam (BNB), and is currently ready for vacuum operations with plans for beam data taking by the end of the year. This talk will present the current status of the ICARUS detector and its physics goals.

Speaker: Mr Zachary Williams (University of Texas at Arlington)

ICARUS DPF Presentation_ 07_30_2019.pdf

130 Recent results from MicroBooNE

MicroBooNE is a 85-ton active volume Liquid Argon Time Projection
Chamber (LArTPC) which has been collecting data from the Booster
Neutrino Beam at Fermilab since 2015. LArTPCs are imaging detectors that
present neutrino interactions with excellent spatial resolution and
are a leading technology for the next generation of neutrino
experiments. The main goal of MicroBooNE is to investigate the low
energy electromagnetic excess observed by the MiniBooNE experiment. It
will also perform precise measurements of neutrino cross sections on
argon at ~1 GeV neutrino energy, as well as provide important LArTPC R&D
for future detectors. In this talk, I will present recent results from
MicroBooNE on detector technology, event reconstruction techniques,
and neutrino measurements.

Speaker: Dr Wei Tang (University of Tennessee)

DPF2019_uB_WeiTang_2019_07_30.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

131 The research and development of the DarkSide-20k detector

DarkSide-20k is a dual-phase argon detector for dark matter searches, which has the capability to push the sensitivity for WIMP detection several orders of magnitude beyond current levels. It will have ultra-low backgrounds and sensitivity to WIMP-nucleon cross section down to 1.2 x 10^{47} cm^2 for WIMPs of 1 TeV/c^2 mass with a LAr exposure of 100 t yr. The DarkSide-20k detector is currently under construction at LNGS, and it mainly consists of a sealed acrylic Time Projection Chamber (TPC), an active neutron veto constructed by gadolinium-doped acrylic panels and a membrane cryostat. The R&D of the TPC is currently in progress at CERN; two prototype detectors are being built to demonstrate the key techniques which are going to be used in DarkSide-20k. The R&D of the veto detector is also underway, by cooperating with Donchamp Inc., a company specialized in radio-pure acrylic production.
In this talk, we will give an overview of the DarkSide-20k detector and discuss all the related R&D work.

Speaker: Yi Wang (University of California Los Angeles (US))

R&D of DS-20k.pdf

132 Development and Testing of LZ’s High Voltage Grids

To observe signals from low-energy nuclear recoils, including WIMP-xenon scatters, the LZ dark matter detector must maintain strong drift and extraction fields within its dual-phase xenon time projection chamber (TPC). This will be accomplished with a set of four high-voltage grids made of stainless steel wire mesh that are placed at various heights in the TPC. Reaching and holding the grids’ design voltages is a prerequisite to LZ’s main WIMP search. In addition, limiting spurious electron emission background from the grid wires enables probes of lower-mass dark matter via an ionization-only search. To achieve both of these goals, a grid production program has been set up in parallel with a high-voltage testing program at SLAC. This talk will present the LZ grid production process, outlining the design drivers and the technical challenges faced in building LZ-scale electrodes as well as insights gained from high-voltage testing of both small prototype grids and LZ’s full-scale grids.

Speaker: Mr Ryan Linehan (SLAC/Stanford)

Linehan_DPF_2019.pdf

133 Designing and Building a Scintillating LAr Bubble Chamber for WIMPs and reactor CEvNS

The Scintillating Bubble Chamber (SBC) is a rapidly developing new technology for sub-keV nuclear recoil detection. Demonstrations in liquid xenon at the few-gram scale have confirmed that this technique combines the event-by-event energy resolution of a liquid-noble scintillation detector with the world-leading electron-recoil discrimination capability of the bubble chamber, and in fact maintains that discrimination capability at much lower thresholds than traditional Freon-based bubble chambers. The promise of unambiguous identification of sub-keV nuclear recoils in a scalable detector makes this an ideal technology for both GeV-mass WIMP searches and CEvNS detection at reactor sites. We will present progress from the SBC Collaboration towards the construction of a 10-kg argon bubble chamber with SiPM-based scintillation readout to test the low-threshold performance of this technique in a physics-scale device.

Speaker: Rocco Coppejans (Northwestern University)

Coppejans_SLArBC_DPF_Draft_2.pdf

134 Development and characterization of noble solid bolometers

Noble liquid detectors have become an attractive option for exploring physics beyond the standard model. Current experiments are using these detectors to search for dark matter interactions, neutrinoless double beta decay, and other phenomena. Improved energy resolution can be leveraged from an optimized combination of two detection channels: ionization and scintillation. Experimentally, a microscopic anti-correlation behavior between these signals has been observed, but it has not been described from first principles. Making measurements in a third channel would provide useful information about the microscopic anti-correlation phenomenon. Work is currently underway at Drexel University to develop solid argon and xenon bolometers, which would be able to utilize a heat channel in addition to ionization and scintillation. Present efforts are aimed at developing a method for growing small noble solid samples via vapor deposition onto a substrate over a wide range of temperatures down to 10 K. Understanding the sample growth is the first step to develop techniques for integrating detector components to measure ionization and scintillation signals. This will allow for improved characterization of noble solids as detector media. In the future, efforts will be focused on the growth of these detectors in the Drexel dilution refrigerator, where samples can be cooled to 20 mK to include bolometric measurements for the simultaneous readout of the three detection channels.

Speaker: Philip Weigel (Drexel University)

weigel_DPF_2019.pdf

135 Current Status of the DESI Focal Plane System

The Dark Energy Spectroscopic Instrument (DESI) is a Stage IV dark energy experiment under construction to measure the expansion history of the Universe using baryon acoustic oscillations (BAO) and the growth of structure using redshift-space distortions (RSD). With 5000 robotically-actuated fibre positioners, the 5-year redshift survey will map 35 million galaxies and quasars and place new constraints on many cosmological parameters concerning dark energy, modified gravity, inflation, and neutrinos. I will describe and provide a status update on the DESI focal plane system, which has been built at multiple institutions, integrated at LBNL, and is ready for final installation at Kitt Peak National Observatory (KPNO).

Speaker: Duan Yutong (Boston University & Lawrence Berkeley National Laboratory)

duan-aps_dpf_2019-desi.pptx

pptx_gdrive

136 Cherenkov and scintillation separation using dichroic Winston cones

Large-scale neutrino detectors deploy a wide variety of technologies, most commonly water, ice, or scintillator targets surrounded by PMTs. The detected photons carry information that goes unused, most notably the wavelength, which can indicate the production method and travel time of the photon. In particular, in scintillator detectors, wavelength can be used to discriminate Cherenkov from scintillation light due to the broad wavelength distribution of Cherenkov light. This discrimination provides a method for reconstructing the direction of the events, which is crucial for identifying solar neutrino interactions. A novel method for sorting photons by their wavelengths is introduced using Winston cone concentrators built out of dichroic filters.

Speaker: Tanner Kaptanoglu (University of Pennsylvania)

dpf_dichroic_talk.pdf

QCD & Heavy Ions

parallel sessions

Conveners: Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

137 Latest Development in Jet Substructure Techniques

I will review recent advances of tools that help improve the performance and analytic understanding of boosted object tagging and background mitigation. I will also discuss the fast developing fields of heavy ion jet substructure studies and machine learning applications at high energy colliders. In the end I will discuss a new class of collinear drop observables which allows systematic studies of soft radiation inside jets.

Speaker: Dr Yang-Ting Chien (Massachusetts Institute of Technology)

DPF2019_Chien.pdf

138 Multi-jet cross section measurements at the LHC

Speaker: Christine Angela McLean (SUNY Buffalo)

DPF2019_MultijetMeasurements_McLean.pdf

139 Novel probes of QCD: precision measurements of jet substructure at the LHC

Theoretical calculations for jet substructure observables with accuracy beyond leading-logarithm have recently become available. Such well-understood observables provide novel probes of QCD in a new, collinear regime at the LHC. In this talk, measurements by the ATLAS, CMS, ALICE and LHCb collaborations of such jet substructure observables are presented. These measurements may be performed in a variety of topologies, and may be unfolded to particle-level to make comparisons with Monte Carlo simulations and analytical calculations.

Speaker: Matt LeBlanc (University of Arizona (US))

20190801_MLB_JSSDPF.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

140 Charm CP Violation

We discuss the implications of the recent discovery of CP violation in charm decays at LHCb. Furthermore, we show in which modes to search for charm CP violation next and present U-spin sum rules for CP asymmetries of charmed baryon decays.

Speaker: Stefan Schacht (Cornell University)

dpf-schacht.pdf

141 Hadronic charm decays at BESIII

BESIII has collected data samples corresponding to luminosities of 2.93 fb-1, 3.19 fb-1 and 0.567 fb-1 at center-of-mass energies of 3.773, 4.178, and 4.6 GeV, respectively. The data set collected at 3.773 GeV contains quantum-correlated D0D0bar pairs that provide access to strong-phase differences between amplitudes. We report the measurements of strong phase differences for D0(-bar) -> K_S/L pi+pi- that will reduce the uncertainties of the LHCb and BelleII gamma/phi3 measurements. In addition, we report measurements of absolute branching fractions and amplitude analyses for various D+, D0, Ds+ and Lambda_c+ decays.

Speaker: Hajime Muramatsu

DPF_2019_BES3.pdf

142 Semileptonic and leptonic charm decays at BESIII

BESIII has collected data samples corresponding to luminosities of 2.93 fb-1 and 3.19 fb-1 at center-of-mass energies of 3.773 and 4.178, respectively. Based on these, we report measurements of the decays D(s)+ -> l+v (l=mu, tau), D0(+) -> K-bar(pi)l+v (l=e,mu), D0(+) -> K-bar(pi)pie+v, D0(+) -> a0(980)e+v, Ds+ -> eta(')e+v and Ds+ -> K(*)0e+v. From these analyses, precise determinations of the decay constants fD(s)+, the semileptonic form factors f^P_+(0) [P=K, pi, eta(')], the CKM matrix elements |Vcs(d)| are extracted. These results test LQCD calculations of fD(s)+ ,f^P_+(0) and the unitarity of the CKM matrix. Precision tests of lepton flavor universality are also made using D(s)+ -> l+v and D0(+) -> K-bar(pi)l+v, decays.

Speaker: Alex Gilman

Talk.pdf

143 Measurements of charmed baryon decays from LHCb

Copious numbers of charmed baryons are produced by the LHC. These are detected in various decay modes using the LHCb detector. We report on some unique decays that give incite into weak decay mechanisms. We also contrast with beauty baryon decays in some instances.

Speaker: Michael Kent Wilkinson (Syracuse University (US))

DPF 2019.pdf

15:30 Coffee Break

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Stefania Gori (UC Santa Cruz), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US))

144 Search for top squark production with CMS detector at 13 TeV

We present searches of the top squark production with the data collected by CMS detector, at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 137/fb. A variety of final state decays are considered with an emphasis on targeting different kinematic regions. These channels have distinctive signatures and deep learning top taggers are used to further optimizes searches.

Speaker: Matthew Kilpatrick (Rice University (US))

DPF2019_Kilpatrick_072919_final.pdf

145 Search for direct stop pair production with the ATLAS detector

Supersymmetry, which extends the Standard Model (SM) by introducing supersymmetric partners for the SM particles, can provide an elegant solution to the hierarchy problem. One of the most important parameters in supersymmetry is the mass of the supersymmetric partner to the top quark, referred to as stop. In the absence of the stop signature in the previous searches at the LHC, compressed stop searches in which the mass of the stop is close to the mass of the lightest neutralino become more important. In the compressed scenarios, the momentum transfer to decay products of the stop tend to be low, possibly a few GeV. Hence, the identification and reconstruction of those ``soft'' objects can play a crucial role in the searches. In this talk, recent result from the compressed stop searches in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector and new developments for soft b-hadron tagging techniques are presented.

Speaker: Keisuke Yoshihara (University of Pennsylvania (US))

keisuke_DPF2019_July30_talk.pdf

146 Phenomenology of TeV-scale scalar Leptoquarks in the EFT

We examine new aspects of leptoquark (LQ) phenomenology using effective field theory (EFT). We construct a complete set of leading effective operators involving SU(2) singlets scalar LQ and the SM fields up to dimension six. We show that, while the renormalizable LQ-lepton-quark interaction Lagrangian can address the persistent hints for physics beyond the Standard Model in the B-decays $\bar B \to D^{(*)} \tau \bar\nu$, $\bar B \to \bar K \ell^+ \ell^-$ and in the measured anomalous magnetic moment of the muon, the LQ higher dimensional effective operators may lead to new interesting effects associated with lepton number violation. These include the generation of one-loop sub-eV Majorana neutrino masses, mediation of neutrinoless double-$\beta$ decay and novel LQ collider signals. For the latter, we focus on 3rd generation LQ ($\phi_3$) in a framework with an approximate $Z_3$ generation symmetry, and show that one class of the dimension five LQ operators may give rise to a striking asymmetric same-charge $\phi_3 \phi_3$ pair-production signal, which leads to low background same-sign leptons signals at the LHC. For example, with $M_{\phi_3} \sim 1$ TeV and a NP scale of $\Lambda \sim 5$ TeV, we expect at the 13 TeV LHC with an integrated luminosity of 300 fb$^{-1}$, about $5000$ positively charged $\tau^+ \tau^+$ events via $\boldsymbol{pp \to \phi_3 \phi_3 \to \tau^+ \tau^+ + 2 \cdot j_b}$ ($j_b$=b-jet), about $500$ negatively charged $\tau^- \tau^-$ events with a signature $\boldsymbol{pp \to \phi_3 \phi_3 \to \tau^- \tau^- + 4 \cdot j + 2 \cdot j_b}$ ($j$=light jet) and about $50$ positively charged $\ell^+ \ell^+$ events via $\boldsymbol{pp \to \ell^+ \ell^+ + 2 \cdot j_b + {{\not\!\! E_T}}}$ for any of the three charged leptons, $\ell^+ \ell^+ = e^+ e^+,\mu^+ \mu^+, \tau^+ \tau^+$. It is interesting to note that, in the LQ EFT framework, the expected same-sign lepton signals have a rate which is several times larger than the QCD LQ-mediated opposite-sign leptons signals, $gg,q \bar q \to \phi_3 \phi_3^* \to \ell^+ \ell^- +X$. We also consider the same-sign charged lepton signals in the LQ EFT framework at higher energy hadron colliders such as a 27 TeV HE-LHC and a 100 TeV FCC-hh.

Speaker: jonathan cohen (technion)

lepto_talk_jonathan.pdf

147 Status of leptoquark searches at CMS

Leptoquarks are hypothetical bosons with fractional electric charge which present a new symmetry between quarks and leptons. They are predicted in multiple models of physics beyond the standard model, including as a potential explanation of the current tension with the standard model seen in the decays of B mesons. An overview of the theoretical motivation and present searches for leptoquarks at CMS will be presented, in all three lepton generations, along with a discussion of the state of new searches targeting anomalies in the B-physics sector.

Speaker: Dr David Morse (Northeastern University (US))

Morse_David_DPF_LQ.pdf

148 Search for vector like quarks with ATLAS

One of the most pressing issues in particle physics is the hierarchy problem: how is the Higgs boson so light? A common feature in many of the theories proposed to solve the hierarchy problem is the prediction of TeV-scale vector like quarks. This talk will give an overview of the recent searches for vector like quarks performed by the ATLAS experiment and the combination of vector like quark searches using 36 fb$^{-1}$ of integrated luminosity from $pp$ collisions at $\sqrt{s}=13$ TeV recorded by the ATLAS detector.

Speaker: Joseph Haley (Oklahoma State University (US))

Haley_VLQ_DPF.pdf

149 A Search for Di-Leptonic Final State Vector-Like Quark Pair Production in 13 TeV pp Collisions using CMS Data

We describe a search for the production of a pair of vector-like quarks (VLQ's) with masses greater than 1000 GeV/c$^2$in a di-lepton final state using data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS Experiment. The analysis is based on detection of a di-lepton pair from the decay of a $Z$ boson and is sensitive to events in which one VLQ decays to a $b$ quark and a $Z$ boson and the other to a $b$ quark and either a $Z$ or a Higgs boson. Requiring that the event kinematics are consistent with a di-leptonic $Z$ decay, with either a $Z$ or Higgs decaying to jets and that the reconstructed VLQ's have equal masses greatly reduces the background from Standard Model processes. We use a $\chi^2$ procedure based on the Higgs or $Z$ mass and the equality of the two VLQ masses to select the correct combinations of jets. Since for a highly boosted Higgs or $Z$, the two jets resulting from the daughter quarks might be merged to a single jet, we carry out two independent analyses depending on the number of observed jets. We present the expected exclusion limits from the combined analyses corresponding to 138 fb$^{-1}$ of integrated luminosity collected by CMS during the 2016, 2017 and 2018 run period.

Speaker: Pamela Pajarillo (Rutgers State Univ. of New Jersey (US))

APS_DPF Meeting 07_29_2019 FINAL (1).pdf

150 The Four-Fermi Interaction in the Standard Model Effective Theory

The Standard Model Effective Theory (SMEFT) is a powerful tool to constrain physics beyond the Standard Model through data, without making restricting assumptions about the nature of the UV theory.
Even though there has been a lot of work put into constraining many of the dimension 6 operators, the large subset of four-Fermi operators has been wildly neglected in NLO analysis, due to SMEFT being a non-classically renormalizable theory. We present an investigation into the treatment of the renormalization procedure in combination with dimensional regularization and specifically a recipe how to treat \gamma_5 in a self-consistent way, while preserving all relevant Ward identities.
Furthermore, as an application of our newly compiled techniques, we present bounds on a number of four-Fermi Wilson coefficients derived through considering Top quark decay helicity fractions as well comparing well-measured low energy observables (namely Z boson partial widths and the effective weak mixing angle) to their SMEFT predictions.

Speaker: Dr Daniel Wiegand (Northwestern University/ANL)

DanielWiegandDPFSlides.pdf

Cosmology & Dark Energy

parallel sessions

Conveners: Michael Troxel (Duke University), Neelima Sehgal, Vivian Miranda (University of Arizona)

151 Constraining Temporal Oscillations of Cosmological Parameters Using Type Ia Supernovae

The existing set of type Ia supernovae (SNe Ia) is now sufficient to detect oscillatory deviations from the canonical $\Lambda$CDM cosmology.
We determine that the Fourier spectrum of the Pantheon data set of spectroscopically well-observed SNe Ia is consistent with the predictions of $\Lambda$CDM.
We also develop and describe two complementary techniques for using SNe Ia to constrain those alternate cosmological models that predict deviations from $\Lambda$CDM that are oscillatory in conformal time.
The first technique uses the reduced $\chi^2$ statistic to determine the likelihood that the observed data would result from a given model.
The second technique uses bootstrap analysis to determine the likelihood that the Fourier spectrum of a proposed model could result from statistical fluctuations around $\Lambda$CDM.
We constrain three oscillatory alternate cosmological models: one in which the dark energy equation of state parameter oscillates around the canonical value of $w_{\Lambda} = -1$, one in which the energy density of dark energy oscillates around its $\Lambda$CDM value, and one in which gravity derives from a scalar field evolving under an oscillatory coupling.
We further determine that any alternate cosmological model that produces distance modulus residuals with a Fourier amplitude of $\simeq 36$ millimags is strongly ruled out, given the existing data, for frequencies between $\simeq 0.08\ \textrm{Gyr}^ {-1} h_{100}$ and $\simeq 80\ \textrm{Gyr}^ {-1} h_{100}$.

Speaker: Mr Sasha Brownsberger (Harvard University)

APS_presentation_SashaBrownsberger.pdf

152 Enhancing Dark Energy Constraints from Redshift-Space Galaxy Clustering

Galaxy clustering from ongoing and forthcoming large galaxy surveys plays an important role in understanding the acclerated cosmic expansion, through the measurements of baryon acoustic oscillations (BAO) and the redhshift-space distortions (RSD). The latter can be used to infer the linear structure growth rate in the universe, which can constrain the equation of state of dark energy and test theories of gravity. Current constraints on the growth rate mainly comes from large-scale RSD, while the intermediate- and small-scale RSD with high statistical power is not used because of model challenges. I will present a method based on high-resolution N-body simulations to accurately model redshift-space galaxy clustering and efficiently explore the parameter space. I will then discuss how systematic effects in relating galaxies to dark matter field could affect our ability to constrain the structure growth rate. I will convey the encouraging message that the intermediate- and small-scale RSD will substantially tighten the constraints on the growth rate and help better constrain dark energy or test theories of gravity.

Speaker: ZHENG ZHENG (University of Utah)

ZhengZheng.pdf

153 Upcoming large-scale structure cosmology results from the Dark Energy Survey Year 3

The Dark Energy Survey (DES) has provided world leading measurements in multiple probes of the late time universe. Using probes of weak gravitational lensing, galaxy clustering, cluster cosmology and supernovae from the first year of observations, DES was able test the Lambda CDM model with greater constraining power than any other individual galaxy survey. I will present the latest updates from the upcoming DES Year 3 large scale structure cosmology results, which use an observed area three times that of Year 1. With greater statistical power, a number of analysis improvements have been implemented including to photometric redshifts, observational systematic mitigation, and astrophysical systematic modelling. DES Year 3 will provide one of the most robust tests of the potential tensions in clustering amplitude between the late and early universe using the combination of galaxy clustering and weak gravitational lensing. We also forecast a 2-3% measurement of the angular diameter distance at redshift of 1 from measurements of the Baryon Acoustic Oscillation scale. The DES results and analysis techniques will pave the way for the next generation of large scale structure cosmology experiments such as LSST and DESI.

Speaker: Jack Elvin-Poole (The Ohio State University)

jackelvinpoole_dpf_2019.pdf

154 Weak-Lensing Mass Calibration of $\mu_{\star}$ at High Redshifts with the Dark Energy Survey Year 1

Galaxy clusters have been established as an important tool to study the matter distribution, the formation and evolution of the structures in the Universe with great potential to be one of the most powerful cosmological probes. To achieve this, we need to understand the systematics involved in the cluster mass calibration, which is the current dominating source of uncertainties for using clusters to probe cosmology. Observationally, we can not assess the true mass of galaxy clusters, but we can rank them by some proxy for the mass. We can define a mass proxy by looking for different observables in the clusters. A good proxy should have a linear relation with the total mass of the cluster and low scatter in comparison to some observable. To meet these requirements, we proposed $\mu_{\star}$, a physically motivated cluster mass-proxy proportional to the total stellar mass of red and blue members, that is independent of the formation history of the red sequence and has a low scatter with the X-ray temperature relation (Palmese et al. 2019). We use redMaPPer galaxy clusters identified in the Dark Energy Survey Year 1 data for reliable calibration of $\mu_{\star}$ at high redshifts. In a blinded analysis, we perform the mass-calibration of $\mu_{\star}$ using $\sim 6,000$ clusters split into 12 subsets spanning in the ranges of $0.1 \leq z<0.65$ and $\mu_{\star}$ up to $\sim 5.5 \times 10^{13} M_{\odot}$ to infer the average masses of these subsets through a modelling of their stacked weak lensing signal. In our model we account for the following sources of systematic uncertainty: shear measurement and photometric redshift errors, miscentring, cluster-member contamination of the source sample, deviations from the NFW halo profile, halo triaxiality and projection effects. We use the inferred masses to estimate a jointly mass-$\mu_{\star}$-$z$ scaling relation. In this talk, we will present our results and discuss the use of $\mu_{\star}$ as a mass proxy for future applications in cluster cosmology.

Speaker: Dr Maria Elidaiana da Silva Pereira (Brandeis University)

Maria_DPFtalk.pdf

DOE: Cosmic Frontier

Conveners: Eric Linder (Berkeley Lab), Kathy Turner

155 DOE Cosmic Frontier Overview

Speaker: Eric Linder (Berkeley Lab)

HEP-PI-Cosmic 2019final.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

156 DarkSide-50 Results and the Future Liquid Argon Dark Matter Program

DarkSide uses a dual-phase Liquid Argon Time Projection Chamber to search for WIMP dark matter. The talk will present the latest result on the search for low mass ($M_{WIMP} <20GeV/c^2$ ) and high mass ($M_{WIMP}>100GeV/c^2$) WIMPs from the current experiment, DarkSide-50, running since mid 2015 a 50-kg-active-mass TPC, filled with argon from an underground source. The next stage of the Darkside program will be a new generation experiment involving a global collaboration from all the current Argon based experiments.
DarkSide-20k, is designed as a 20-tonne fiducial mass TPC with SiPM based photosensors, expected
to be free of any instrumental background for an exposure of >100 ton x years. Like its predecessor DarkSide-20k will be housed at the Gran Sasso (LNGS) underground laboratory, and it is expected to attain a WIMP-nucleon cross section exclusion sensitivity of $10^{-47}\, cm^2$ for a WIMP mass of $1 TeV/c^2$ in a 5 yr run.
A subsequent objective, towards the end of the next decade, will be the construction of the ultimate
detector, ARGO, with a 300 t fiducial mass to push the sensitivity to the neutrino floor region for high mass WIMPs.
The combination of the three experiments part of a single family will cover completely the WIMP hypothesis from 1GeV/c2
to several hundreds of TeV/c2 masses.

Speaker: Yi Wang (University of California Los Angeles (US))

DS-50.pdf

157 The Most Recent Results of the LUX Dark Matter Experiment

LUX (Large Underground Xenon) was a dark matter experiment using a two-phase Xe Time Projection Chamber housed and operated at the Sanford Underground Research Facility (SURF) in Lead, South Dakota from 2012 to late 2016. It previously published three world-leading limits on the spin-independent cross-section for Weakly Interacting Massive Particle (WIMP) dark matter via direct detection, with a fiducial mass of 100 to 150 kg. In this talk, I will report on the recent analysis efforts the LUX collaboration is making to fully utilize data from the 4 years of detector operation, even since Fall 2016 when the detector was dismantled. The additional analyses with the existing science and calibration data sets are probing different dark matter models and detection techniques, as well as searching for other rare-event phenomena. This work pushes the exploitation of LUX data at both low and high energies, with some searches focusing on energy ranges that have not yet been studied. In pursuing several new results recently, LUX is also being used to understand the potential detector performance of future dual-phase detectors for WIMP-nucleon scattering, and to demonstrate new analysis methods that can be used to improve our discrimination of backgrounds within next-generation experiments.

Speaker: Prof. Matthew Szydagis (University at Albany)

LUX_Szydagis_APS_DPF2019.pptx

158 Neutron and γ Backgrounds in the LUX-ZEPLIN Dark Matter Detector

The LUX-ZEPLIN (LZ) Dark Matter Collaboration aims to identify the elusive dark matter particle that appears to make up one quarter of the energy density of our universe. LZ is optimized to detect dark matter that produce nuclear recoils using a multi-tonne liquid xenon target, making it critical that all nuclear recoil background events are identified and understood. We present here simulated results of neutron interactions in LZ's outer detector, which was designed for identifying neutrons that may deposit energy in the LZ target volume. In addition, we report on the $\gamma$-X phenomenon where multiple-scattering $\gamma$ photons can appear as a single nuclear recoil event along with methods for constraining the number of $\gamma$-X events observed after LZ's first data is collected.

Speaker: Gregory Rischbieter

APS_DPF_Rischbieter.pdf

159 Cleaning LZ: getting rid of unwanted backgrounds

Dark Matter makes up ~25% of the energy density of the universe but has yet to be directly detected. Numerous efforts are ongoing to build ever bigger and ever more sensitive detectors to try and detect it. The LUX-ZEPLIN (LZ) experiment, with its 10 tons of liquid xenon, will reach unprecedented sensitivity. However, this can only happen if all potential backgrounds are under control. To make sure of this, and especially to tackle the issue of radon, the most unforgiving background in the experiment, an extensive cleaning and tracking campaign has been underway. In this talk, I will go over the steps that LZ takes in order to estimate, mitigate and get rid of its backgrounds, especially radon.

Speaker: Prof. Cecilia Levy (University at Albany, SUNY)

APS-DPF2019_ Cleaning LZ_ how to get rid of unwanted backgrounds.pdf

160 Astroparticle Physics with a Generation-3 Liquid Xenon Detector

This talk will present the science case for a future generation-3 liquid xenon time projection chamber for astroparticle physics. Such an experiment is envisioned to follow the current generation of experiments such as LZ and XENONnT, delivering diverse science at moderate cost. With a sensitivity sufficient to probe WIMP dark matter down to the signal from atmospheric neutrinos, numerous science channels are available. This includes various dark matter models including spin-dependent, spin-independent, and other WIMP couplings; sub-GeV WIMPs; leptophilic dark matter models; and axion-like particles and solar axions. In addition, such a detector will be a true multi-purpose astroparticle observatory. A precision measurement of solar pp-neutrinos is possible as is a measurement of solar boron-8 neutrinos through coherent elastic neutrino nucleus scattering. Atmospheric neutrinos provide another scientifically interesting target. The detector can also provide complementary neutrino flavor-independent information in case of a Galactic supernova event. Depending on the eventual realization, even searches for neutrinoless double-beta decay or a first measurement of solar CNO neutrinos will be possible.

Speaker: Rafael Lang

rafael_g3lxe.pdf

161 Estimating Si-32 and tritium in the SuperCDMS SNOLAB detectors

The SuperCDMS SNOLAB experiment will search for low-mass (< 10 GeV/c^2) dark matter employing germanium and silicon crystals instrumented with cryogenic phonon and ionization detectors. The expected dominant backgrounds are due to long-lived radioactive isotopes present and/or produced in the natural environment. Specifically, Si-32 is cosmogenically created in the atmosphere and is incorporated into silicon ‘ore’ through natural precipitation (rain) processes. This pure beta-decay background from Si-32 (and progeny P-32) is only significant in silicon-based detectors. However, both germanium and silicon crystals accumulate tritium – another pure beta emitter – due to nuclear spallation as a result of exposure to cosmic-ray secondaries. This presentation will overview the SuperCDMS SNOLAB experiment and review calculation assumptions and background rate expectations for Si-32 and tritium levels which are expected to be the primary backgrounds for the experiment.

Speaker: John Orrell (Pacific Northwest National Laboratory)

APS-DPF2019-SuperCDMS-Orrell.pdf

162 Dark Matter search results from DAMIC at SNOLAB

The DAMIC experiment at SNOLAB uses thick fully-depleted scientific grade charge-coupled devices (CCDs) to search for the interactions of dark matter particles in the galactic halo with ordinary silicon atoms. Because of the low instrumental (less than $2\ e^-$) noise, DAMIC CCDs are particularly sensitive to ionization signals expected from low-mass dark matter particles. For the past two years, DAMIC has collected dark-matter search data with an array of seven CCDs (40-gram target, 13 kg day exposure) installed in a low radiation environment in the SNOLAB underground laboratory. I will present recent results from the searches for WIMP and hidden-sector dark matter, which cover a wide range of particle masses from $\rm \sim1\ MeV c^{-2}$ to $\rm \sim 10\ GeV c^{-2}$. In particular, we probe—for the first time with the same nuclear target—a large fraction of the parameter space corresponding to the event excess previously observed by the CDMS-II silicon experiment.

Speaker: Mr Alexander Piers (University of Washington)

Piers_DPF_damicAtSnolab.pdf

Education & Outreach

parallel sessions

Conveners: Kevin Pitts (University of Illinois), kathryn jepsen (Stanford University)

163 The AAAS Science and Technology Policy Fellowship program

The AAAS Science and Technology Policy Fellowship program provides opportunities for PhD scientists to learn first-hand about federal policymaking while using their knowledge and skills to address today’s most pressing societal challenges. In this talk, I will discuss my experience as a AAAS Fellow in the Office of High Energy Physics at the Department of Energy.

During my two-year placement, I worked on a variety of projects: working with members of the particle physics community to prepare for annual visits to the Hill, writing and editing science articles for the general public, supporting the development of a new interdisciplinary HEP program in quantum information science, and promoting an interagency effort to advance high performance computing capabilities for cancer research. I will also discuss the role of scientists in the policymaking process more broadly, and highlight opportunities for aspiring fellows and others interested in increasing their engagement with policymakers and the public.

Speaker: Andrea Peterson

Peterson_AAAS_STPF.pdf

164 The Italian Summer Students Program at Fermi National Accelerator Laboratory

Since 1984 the Italian groups of the Istituto Nazionale di Fisica Nucleare (INFN), collaborating with the DOE laboratory of Fermilab have been running a two-month summer training program for Italian university students. While in the first year the program involved only four physics students of the University of Pisa, in the following years it was extended to engineering students. This extension was very successful and the enginering students have been since then extremely well accepted by the Technical and Accelerator Division groups.
Since 2004 the program has been supported in part by DOE in the frame of an exchange agreement with INFN. An additional agreement for sharing support for engineers of the School of Advanced Studies of S.Anna (SSSA) of Pisa was established in 2007 between SSSA and Fermilab. In the frame of this program four SSSA students are supported each year. Over its 35 years of history, under the management of the Cultural Association of Italians at Fermilab (CAIF), the program has grown in scope and size and has involved more than 500 Italian students from more than 20 Italian Universities, Since the program does not exclude appropriately-selected non-italian students, a handful of students of European and non-European Universities were also accepted in the years.
Each intern is supervised by a Fermilab Mentor who is responsible for performing the program. Training programs spanned from Tevatron, CMS, MicroBooNE, Nova, Muon (g-2) experimental data analysis, development of particle detectors (e.g. silicon trackers, calorimeters, drift chambers, neutrino and dark matter detectors), design of SBN and Mu2e experiments, design of electronic and accelerator components, development of infrastructures and software for tera-data handling, research on superconductive elements and on accelerating cavities, theory of particle accelerators.
Since 2010, within an extended CAIF program supported by the Italian Space Agency and the Italian National Institute of Astrophysics, a total of 25 students in physics, astrophyics and engineering have been hosted for two months in summer at US space science Research Institutes and laboratories.
In 2015 the University of Pisa included these programs within its own educational programs. Accordingly, Summer School students are enrolled at the University of Pisa for the duration of the internship. At the end of the internship the students are required to write summary reports on their achievements, which are saved in the Fermilab web pages and in the CAIF archives, After positive evaluation by a University Examining Board, interns are acknowledged 6 ECTS credits for their Diploma Supplement.
The CAIF program is now part of the outreach activities of the European Projects MUSE (H2020-MSCA-RISE-2015 GA 690835), NEWS (H2020-MSCA-RISE-2016 GA 734303) and INTENSE (H2020-MSCA-RISE-2016 GA 822185).
Information on student recruiting methods, on training programs of recent years and on final student`s evaluation process at Fermilab and at the University of Pisa will be given in the presentation.

Speaker: Prof. Simone Donati (Infn)

ApsDpf2019_Donati.pdf

165 Cultivating appreciation for science via “Big Bang Science Fair” at WaterFire Providence

On September 22, 2018, Brown University, together with colleagues from ATLAS and CMS experiment, hosted a science outreach event the “Big Bang Science Fair” during a WaterFire Lighting in Providence. Our goal is to bring science outreach to new audiences and to raise public awareness and appreciation for the role of science in our society at the concrete example of the research at the Large Hadron Collider. The Large Hadron Collider is meant as a hook to make a pitch for science in general and help promote the importance and wonders of science to a general public and draw parallels between science and art as timeless expressions of human culture. The event featured popular science lectures by renowned scientists from physics and other disciplines, workshops, hand-on-demonstrations and exhibits as well as concerts and artwork generated around the theme of the Large Hadron Collider and its research and was attended by some 4,000 people. We will present our experience in hosting this outreach event for a large audience.

Speaker: Ulrich Heintz (Brown University (US))

Heintz-DPF2019.pdf

166 ColliderScope: Electronic(s) Music for Collider Physics

If science outreach is about connecting with new audiences, music remains a uniquely accessible form of outreach. However, physics music needn’t be limited to campy parodies. A new project for creating music that is accessible at multiple technical levels will be presented. Using a form of 2D wavetable synthesis, a new form of electronic music uses stereo audio signals, mapped onto an oscilloscope’s X-Y mode, to create 3D images of LHC experiments from the music itself. Both composed and improvised forms of this project are able to reach electronics communities, fans of electronic music, and musicians; and physics departments can revive analog oscilloscopes from storage to create an essentially free outreach display.

Speaker: Lawrence Lee Jr (Harvard University (US))

073019_LLee_ColliderScope.pdf

167 CANCELLED Increasing social-belonging in introductory physics courses at MIT

We report here progress on a research program at MIT to increase the sense of “belonging” (Walton & Cohen, 2007) for women and under-represented/minoritized undergraduates in the MIT Physics Department, as a means to support recruitment and retention in the physics major and onwards into graduate education. This work builds on social-psychological research to develop social-belonging interventions for the first-year physics courses required of all undergraduates at MIT. The interventions consist of having students, at an early or critical juncture in their education, read and write reflections on short testimonials in which peers describe how they faced and overcame challenges in similar situations. Previous randomized experimental results have shown that these seemingly small, isolated interventions are capable of producing substantial, lasting effects, in particular for under-represented students (Walton & Wilson, 2018). This work takes place in the context of larger departmental efforts to improve the environment for all members of the physics community, and these interventions complement, but do not replace, other resources, peer-groups, and support programs for students. In this contribution, we will share what we have learned from preliminary mid-course and post-course survey results, grades, and first-year major declaration and final graduation statistics.

Speaker: Kerstin Perez (MIT)

168 CANCELLED How to effectively communicate with the public about your research

I am president and founder of Academy Communications, a national media-relations firm specializing in higher education institutions. We help faculty researchers at colleges and universities across the country communicate their work and insights more effectively with major news media, in addition to other services.

I am also a writer, editor and speaker, a former on-campus communicator for arts, sciences and engineering at Tufts University--and a member of New England Science Writers.

I'm interested in delivering a 15-minute talk about education or outreach to a group of mostly early-career physicists at your conference in Boston this summer.

For over 30 years, I have been helping some of the nation's brightest scientists learn how to effectively communicate with the public about their research, how to talk to reporters, the process of reporting on a scientific result, and how to work most effectively with the on-campus communications professionals at their colleges and universities.

I would be happy to develop a 15-minute session that would enlighten and inform your group. This would not be a sales pitch for my firm, but a valuable and helpful presentation to help advance more effective science communication. It would include handouts and a Q&A.

Speaker: Mr Randell Kennedy (Academy Communications)

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University (US)), Ashutosh Kotwal (Duke University), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

169 Search for the Higgs boson decaying to a pair of muons in $pp$ collisions at 13 TeV with the ATLAS detector

This talk will describe the search for the dimuon decay of the Higgs boson using the data corresponding to an integrated luminosity of 139 fb$^{−1}$ collected with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV at the Large Hadron Collider. Events are divided into several channels to target either the gluon-gluon fusion (ggF) Higgs production or the vector-boson-fusion (VBF) Higgs production using boosted decision trees (BDT). The measurement is then performed with a simultaneous fit to the dimuon mass in those regions. A signal significance of X sigma is observed, while a signal significance of Y sigma is expected.

Speaker: Jay Chan (University of Wisconsin Madison (US))

DPF2019_Hmumu.pdf

170 Rare Higgs Decays into Quarkonia Pairs

Rare decays of the Higgs boson to mesons are a promising laboratory to study couplings to lighter quarks and physics beyond the standard model. A search for decays of the Higgs and the Z boson to pairs of J/ψ and Y resonances with subsequent decays of the mesons into muon pairs is performed with the Compact Muon Solenoid detector at the Large Hadron Collider (LHC). A data sample of proton-proton collisions collected in 2017 at a center-of-mass energy of 13 TeV is used. I will present results of this search and implications for future searches of beyond standard model signatures at high luminosity.

Speaker: Mr Himal Acharya (University of Tennessee (US))

APS_DPFMeeting_Himal_v2.pdf

171 Measurement of Higgs boson production in association with a ttbar pair in the diphoton decay channel using 139 fb$^{-1}$ of LHC data collected at $\sqrt{s}$ = 13 TeV by the ATLAS experiment

A measurement of the $ttH$ production in the diphoton decay channel is performed using 139 fb$^{-1}$ of pp collision data with a center-of-mass energy √s = 13 TeV recorded by the ATLAS experiment at the LHC. Two regions are defined to target either the fully hadronic or semi-leptonic decay of the top quark. In each, a boosted decision tree (BDT) is trained to create ttH enhanced categories. The measurement is then performed with a simultaneous fit to the diphoton mass in these BDT-based categories.

The $ttH$ production is observed in the diphoton decay mode with a significance of 4.9 standard deviations, compared to an expected significance of 4.2 standard deviations. The $ttH$ cross section times $H\to$$\gamma\gamma$ branching ratio is measured to be $1.59^{+0.43}_{−0.39}$ fb, in agreement with the Standard Model prediction. This is the first single channel observation of the $ttH$ production, and the first published measurement using the full ATLAS Run 2 data set.

Speaker: Chen Zhou (University of Wisconsin Madison (US))

chenzhou_20190730.pdf

172 Search for associated production of a Higgs boson and a single top quark in proton-proton collisions at sqrt(s) = 13 TeV

A search is presented for the production of a Higgs boson in association with a single top quark by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV. The production cross section for this process is highly sensitive to the absolute values of the top quark Yukawa coupling, the Higgs boson coupling to vector bosons, and, uniquely, to their relative sign. Analyses using multilepton signatures, targeting H → WW, H → ττ, and H → ZZ decay modes, and signatures with a single lepton and a bb pair, targeting the H → bb decay, are combined with a reinterpretation of a measurement in the H → γγ channel to constrain the Yukawa coupling. Results from the 2016 dataset, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, will be presented, along with prospects for future measurements.

Speaker: Kenneth Bloom (University of Nebraska Lincoln (US))

thq_dpf_190730.pdf

173 Search for ttH production in the H → bb decay channel at CMS

A search for associated production of a standard model Higgs boson with a top quark-antiquark pair ($\rm{t\bar{t}H}$), in which the Higgs boson decays into a $\rm{b\bar{b}}$ pair, will be presented. Latest results are shown obtained using pp collision data recorded by the CMS experiment. Candidate $\rm{t\bar{t}H}$ events are selected based on the number of leptons in the final state from the $\rm{t\bar{t}}$ decay, and are further categorized according to the number of jets. Multivariate techniques are employed for the final event classification with an aim to discriminate between signal and background processes. Particularly challenging backgrounds arise from the $\rm{t\bar{t}}$ + heavy-flavour jet production. A combined fit of multivariate discriminant distributions in all categories and $\rm{t\bar{t}}$ decay channels is finally used to extract the $\rm{t\bar{t}H}$ signal.

Speaker: Abhisek Datta (Cornell University (US))

DPF2019_Abhisek_Datta_CMS_ttHbb.pdf

174 "Measurement of ttH production in multileptonic final states in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector"

Associated production of $t$ and $\bar{t}$ quark pairs along with a Higgs boson is an important Standard Model process as the top-Yukawa coupling can be directly measured from this process. Being the heaviest of the Standard Model particles, the coupling of top quark to Higgs field is expected to be large. Any significant deviation in the rate of this process from standard model expectation is a sign of new physics. We report the latest measurement of this process by the ATLAS experiment at the Large Hadron Collider, where the top, anti-top and Higgs bosons decay into a multileptonic final state

Speaker: Rohin Thampilali Narayan (Southern Methodist University (US))

20190715_DPF.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

175 Status of the MicroBooNE eLLE search and application of deep learning to LArTPC data

MicroBooNE utilizes a liquid argon time projection chamber (LArTPC) located on-axis in the Fermilab Booster Neutrino Beam (BNB) to search for the excess of low energy electromagnetic-like events (eLEE) seen by the MiniBooNE experiment. This talk will present MicroBooNE’s progress in the low-energy excess search, including the status of our deep-learning-based approach for identifying low-energy electron neutrino interactions within the MicroBooNE detector.

Speaker: Ralitsa Sharankova (Tufts University)

DPF_sharankova_20190730.pdf

176 MicroBooNE's Search for a Photon-Like Low Energy Excess

MicroBooNE is a Liquid Argon Time Projection Chamber which has been taking neutrino data at Fermilab's Booster Neutrino Beamline since October 2015. One of its primary goals is to investigate the “Low Energy Excess” of neutrino events observed by the MiniBooNE experiment, for which candidate interpretations include neutrino neutral current (NC) resonant Delta production
with subsequent radiative decay or another anomalous source of single photon production in neutrino interactions. If found to have a higher than Standard Model predicted rate it could be a sizable contribution to the “Low Energy Excess”. This talk will describe the analysis developed to search for NC Delta radiative events in MicroBooNE, consisting of a boosted decision tree based event selection with enhanced background reduction using a convolutional neural network to target the dominant NC neutral pion background.

Speaker: Kathryn Sutton (Columbia University)

DPFTalk_Jul2019_Sutton_7_30_19.pdf

177 Constraining the Neutral Current $\pi^0$ Background for MicroBooNE's Single-Photon Search

Liquid Argon Time Projection Chambers (LArTPCs) are an important technology in the field of experimental neutrino physics due to their exceptional calorimetric and position resolution capabilities. In particular, their ability to distinguish electrons from photons is crucial for current and future neutrino oscillation experiments. The MicroBooNE experiment is utilizing LArTPC technology to investigate the MiniBooNE low-energy excess, which could be either electron-like or photon-like in nature. On the photon-like side, MicroBooNE is searching for single-photon events, the most common of which result from neutral current (NC) $\Delta$ radiative decays. However, this search is complicated by the significantly more common neutrino-induced NC resonant $\pi^0$ production process. In this talk, I present my work in constraining this NC $\pi^0$ background. Using a modified version of the single-photon analysis framework, we instead select two-photon events which are characteristic of the NC $\pi^0$ topology. The selected sample is then used to constrain the systematic uncertainty on the NC $\Delta$ radiative decay measurement, which will be the first of its kind in argon.

Speaker: Andrew Mogan

dpf2019_ncpi0_talk_v3.pdf

178 Compact Perturbative Expressions for Oscillations with Sterile Neutrinos in Matter

We extend a simple and compact method for calculating the three flavor neutrino oscillation probabilities in uniform matter density to schemes with sterile neutrinos, with favorable features inherited. The only constraint of the extended method is that the scale of the matter potential is not significantly larger than the atmospheric ∆m^2, which is satisfied by all the running and proposed accelerator oscillation experiments. Degeneracy of the zeroth order eigensystem around solar and atmospheric resonances are resolved. Corrections to the zeroth order results are restricted to no larger than the ratio of the solar to the atmospheric ∆m^2. The zeroth order expressions are exact in vacuum because all the higher order corrections vanish when the matter potential is set zero. Also because all the corrections are continuous functions of matter potential, the zeroth order precision is much better than ∆m^2_solar/∆m^2_atm for weak matter effect. Numerical tests are presented to verify the theoretical predictions of the exceptional features. Moreover, possible applications of the method in experiments to check the existence of sterile neutrinos are discussed.

Speaker: Xining Zhang (University of Chicago)

DPF2019_Xining _Zhang.pdf

179 The HUNTER Sterile Neutrino Search

The HUNTER experiment (Heavy Unseen Neutrinos from Total Energy-momentum Reconstruction) is a search for sterile neutrinos with masses in the 10-300 keV range. The neutrino missing mass will be reconstructed from 131-Cs electron capture decays occurring in a magneto-optically trapped, laser-cooled sample. Reaction-microscope spectrometers will be used to measure the vector momenta of all charged decay products with high solid angle acceptance, and LYSO scintillators read out by silicon photomultiplier arrays detect x-rays, each with sufficient resolution to reconstruct the neutrino missing mass as a peak separated from the near-zero-mass active neutrinos. The stand-alone apparatus to do this has dimensions of a few meters. The overall design of this W.M. Keck Foundation-­funded experiment will be discussed and simulated performance shown. The initial phase of the experiment can improve on existing limits by about an order of magnitude. Upgrades that would improve the mixing angle sensitivity by many further orders of magnitude will be described.

Speakers: Eddie Chang (UCLA), Eddie Chang (University of California Los Angeles)

HUNTER_DPF_v2.pdf

180 A Search for Sterile Neutrinos with PROSPECT

The Precision Reactor Oscillation and Spectrum Experiment (PROSPECT) performs a precision measurement of reactor antineutrinos through inverse beta decay at a baseline range of 7-9 m from the core of the High Flux Isotope Reactor (HFIR). The single, movable detector has a segmented design of 154 optically separated individual segments that serves multiple purposes. Segments, filled with 6Li-loaded liquid scintillator, cover a range of baselines from the reactor core and allow precise event localization. A reactor-model independent search of eV2-scale sterile neutrino oscillations is achieved by performing a relative measurement of the antineutrino event rates and energy distributions between segments within the detector. This talk will discuss the PROSPECT oscillation analysis and present recent results.

This material is based upon work supported by the U.S. Department of Energy Office of Science and the Heising-Simons Foundation. Additional support is provided by Illinois Institute of Technology, LLNL, NIST, ORNL, Temple University, and Yale University. We gratefully acknowledge the support and hospitality of the High Flux Isotope Reactor, managed by UT-Battelle for the U.S. Department of Energy.

Speaker: Ms Olga Kyzylova (Drexel University)

A Search for Sterile Neutrinos with PROSPECT.pdf

181 Measurement of the Reactor Antineutrino Spectrum from 235U Fission using PROSPECT

PROSPECT is a short-baseline reactor antineutrino experiment designed to search for short-baseline sterile neutrino oscillations and perform a precise measurement of 235U reactor antineutrino spectrum from the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). This measurement probes our understanding of recent anomalous results observed in reactor antineutrinos. PROSPECT uses a ∼ 4-ton optically segmented, Li6-loaded liquid scintillator detector with high light yield, world-leading energy resolution, and excellent pulse shape discrimination. This talk will describe the first year of operations of PROSPECT and report the latest results on the antineutrino spectrum measurement from 235U fissions at HFIR.

This material is based upon work supported by the U.S. Department of Energy Office of Science and the Heising- Simons Foundation. Additional support is provided by Illinois Institute of Technology, LLNL, NIST, ORNL, Temple University, and Yale University. We gratefully acknowledge the support and hospitality of the High Flux Isotope Reactor, managed by UT-Battelle for the U.S. Department of Energy.

Speaker: Pranava Teja Surukuchi (Yale University)

Surukuchi_DPF_2019_final.pdf

182 Latest Results of the Antineutrino Flux and Spectrum from Daya Bay

In this talk, I will present the latest results of the reactor antineutrino flux and spectrum measurements performed by the Daya Bay Reactor Neutrino Experiment. Utilizing six powerful nuclear reactors as antineutrino sources, and eight identically designed detectors deployed in two near and one far underground experimental halls, the Daya Bay experiment has collected the largest reactor antineutrino sample to date. Given the considerable statistics and a comprehensive calibration study, an improved measurement of antineutrino flux with 1.5% relative uncertainty is obtained. The prompt energy spectrum of the inverse beta-decay (IBD) interactions is also found to disagree with the current theoretical models of antineutrino production in nuclear reactors. The individual spectra of the two dominant fissile isotopes, $^{235}$U and $^{239}$Pu, are extracted from the evolution of the prompt spectrum as a function of isotope fission fractions for the first time using commercial reactors. These results provide important inputs to current and future reactor neutrino experiments and modeling.

Speaker: Dr Wenqiang Gu (Brookhaven National Laboratory)

DPF2019_DYB_GU_v2.1.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

183 Physics on the Fast TracK: Incorporating global tracking into the ATLAS trigger

Though hardware-based trackers were a crucial element of the triggering systems for both D0 and CDF, no such system has yet been incorporated into either ATLAS or CMS. The ATLAS Fast TracKer (FTK) is a first step towards this goal and will provide full tracking information for all events passing ATLAS’s Level-1 trigger in Run 3. This system greatly reduces the CPU required to identify track-based signatures like b-jets and taus and allows for the suppression of pile-up effects on missing energy and jet triggers. In addition, it can be used to identify exotic displaced objects with track-based signatures. This talk will present an overview of FTK commissioning and future plans, along with updated projections for FTK performance.

Speaker: Tova Ray Holmes (University of Chicago (US))

2019-07-16-DPFTalk.pdf

184 CMS Trigger in Phase-2

The High-Luminosity LHC (HL-LHC) will open an unprecedented window on the weak-scale nature of the universe, providing high-precision measurements of the standard model as well as searches for new physics beyond the standard model. Such precision measurements and searches require information-rich datasets with a statistical power that matches the high luminosity provided by the Phase-2 upgrade of the LHC. Efficiently collecting those datasets will be a challenging task, given the harsh pileup environment of 200 proton-proton interactions per LHC bunch crossing. CMS uses a two level trigger system to select potentially interesting events. The detector readout electronics and DAQ will be upgraded to allow a maximum L1A rate of 750 kHz, and a latency of 12.5 µs (or 500 LHC bunch crossings). In addition, the L1 trigger will, for the first time, include tracking information and high-granularity calorimeter information. This talk will present an overview of the changes planned for the CMS trigger in Phase-2.

Speaker: Chad Wells Freer (Northeastern University (US))

DPF_Trigger.pdf

185 Level 1 Track Finder at CMS

The High Luminosity upgraded LHC is expected to deliver proton-proton collisions per 25 ns with an estimated 140-200 pile up interactions per bunch crossing. Ultrafast track finding is vital for handling L1 trigger rates in such conditions. An FPGA-based track trigger system, capable of finding tracks with momenta above 2 GeV is presented.

Speaker: Andrew Evan Hart (Rutgers State Univ. of New Jersey (US))

DPF_20190730.pdf

186 A measurement of the position resolution of RD53A modules using the SLAC testbeam

Position resolution is a key property of the innermost layer of the upgraded ATLAS and CMS pixel detectors for determining track reconstruction and flavor tagging performance.  The 11 GeV electron beam at the SLAC End Station A was used to measure the position resolution of RD53A modules with a $50\times50$ and $25\times100\ \mu$m$^2$ pitch. Tracks are reconstructed from hits on telescope planes using the EUTelescope package.  The position resolution is extracted by comparing the extrapolated track and the hit position on the RD53A modules, correcting for the tracking resolution. 12.0 and 7.3 $\mu$m resolution can be achieved for the 50 and 25 $\mu$m directions, respectively, with a 13 degree tilt . This result provides important information for deciding between the two geometries for the upgraded pixel detectors.

Speaker: Gang Zhang (Tsinghua University (CN))

SLAC_testbeam_DPF_v2.pdf

187 Development and Testing of the ATLAS ITk HCCStar ASIC

The ITK strips project is an integral part of the HL-LHC upgrade of the ATLAS detector in 2026, allowing for a fast and accurate reconstruction of charged particle tracks in a busy pileup environment while withstanding the extreme radiation conditions associated with a peak instantaneous luminosity of 7.5 x 10$^{34}$ cm$^{−2}$s$^{−1}$. A major component of the ITK strips projects is the HCCStar, one of three ASIC chips that, alongside the ABCStar and AMAC chips, together collect and compress data from the silicon strip detectors, control and serialize the fast dataflow, and provide monitoring and control of all aspects of the combined system. A comprehensive verification campaign in simulation validated the HCCStar design and trigger rates under many scenarios, and probe station testing has confirmed functionality of thousands of chips. Various irradiation campaigns using gamma, proton, and heavy ion radiation tested the reliability of the chips, the recovery from single-event upsets, and the effects of a total ionizing dose on the chips, while providing real-world experience with the HCCStar.

Speaker: Jeff Dandoy (University of Pennsylvania (US))

DPFHCCStar_JeffDandoy_30July2019.pdf

188 Mapping the CMS inner tracking system with unprecedented precision

The CMS inner tracking system is a fully silicon-based high precision detector. Accurate knowledge of the positions of inactive elements (such as support structures or shields) is important for simulating the detector, planning detector upgrades, and reconstructing charged particle tracks.

The position of the inactive elements can be determined with a limited precision by the geometrical surveys when the CMS detector is not closed. Nuclear interactions of hadrons with the detector material allow to perform these measurements with a sub-millimeter precision in situ, while the detector is collecting LHC collisions data. With this technique, changes due to the effects of the magnetic field, cryogenic cooling, and irradiation can be taken into account.

Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2018 at the LHC are used. Results of 2018 data with the upgraded (Phase-1) pixel detector, which was installed at the beginning of 2017 year, have been compared with published 2015 data taken with the original pixel detector.

Speaker: Anna Kropivnitskaya (The University of Kansas (US))

2019.07_NI_kropiv.pdf

QCD & Heavy Ions

parallel sessions

Conveners: Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

189 The proton radius puzzle

In 2010 the proton charge radius was extracted for the first time from muonic hydrogen, a bound state of a muon and a proton. The value obtained was five standard deviations away from the regular hydrogen extraction. Taken at face value, this might be an indication of a new force in nature coupling to muons, but not to electrons. It also forces us to reexamine our understanding of the structure of the proton. In this talk I will describe an ongoing theoretical research effort that seeks to address this "proton radius puzzle". In particular, I will present the development of new effective field theoretical tools that seek to directly connect muonic hydrogen and muon-proton scattering.

Speaker: Gil Paz (Wayne State University)

Proton_Radius_DPF_2019_July_29_2019.pdf

190 Recent BESIII results on light hadrons

A sample of 1.3 billion J/psi events accumulated in the BESIII detector offers a unique opportunity to study light hadron spectroscopy and decays. In this presentation, recent BESIII results on the production of light hadrons will be highlighted, including amplitude analyses of J/psi radiative and hadronic decays for a variety of channels. Results on light meson decays will also be reported, including the observation of eta’-> rho+ pi-, a precision study of the dynamics in eta’->gamma pi pi decays, and the first observation of a0(980)-f0(980) mixing.

Speaker: Isabella Garzia (INFN)

garzia_DPF2019.pdf

191 Studies of baryon form factors at BESIII

Electromagnetic form factors of baryons provide fundamental information about their structure and dynamics and provide rigorous tests of non-perturbative QCD as well as phenomenological models. However, results in the time-like region have large uncertainties. Production cross sections and form factors of hyperons have only barely been explored. Based on 500 pb^-1 of data collected with the BESIII detector between 2.0 GeV and 3.08 GeV, and data collected at the peak of the psi(3770) resonance and higher energies, we report measurements of the proton form factor in the time-like region using both the energy scan method and the initial state radiation technique. In addition, the line-shape of the Born cross sections of hyperon pairs for Lambda and Lambda_c baryons will be reported, where a non-zero cross section at threshold is observed. Observation of a non-zero relative phase angle between the Lambda hyperon's time-like G_E and G_M electromagnetic form factors is also reported.

Speakers: Isabella Garzia (INFN), Isabella Garzia (Universita di Ferrara & INFN (IT))

AFD2019.pdf

192 Physics Goals of the sPHENIX Experiment

The sPHENIX experiment is a major upgrade to the PHENIX experiment that is currently under construction at Brookhaven National Laboratory. It will begin collecting pp, pA, and AA data in early 2023, enabling high statistics measurements of jet modification factors, upsilon suppression, and heavy flavor production. These measurements will complement those from the LHC experiments and help determine the temperature dependence of the quark-gluon plasma. This talk will introduce the broad physics goals and expected physics performance of the sPHENIX experiment.

Speaker: Molly Taylor (Massachusetts Inst. of Technology (US))

2019 Taylor DPF sPHENIX Physics Goals v3.pdf

193 Calorimetry in the sPHENIX Experiment at RHIC

The sPHENIX experiment at Brookhaven is a second-generation RHIC
experiment designed to measure jets and the upsilon states in heavy
ion collisions with a combination of calorimetry and precision
tracking. A compact tungsten-scintillating fiber electromagnetic
calorimeter and a steel-scintillator hadronic calorimeter both read
out with silicon photomultipliers are are central to the sPHENIX
physics program. The novel designs of the calorimeters, test results
from prototypes, and the physics they enable at RHIC will be
described.

Speaker: John Haggerty (Brookhaven National Laboratory)

haggerty_dpf201907301.pdf

194 Beam energy dependence of the azimuthal anisotropic flow from RHIC

Measurements of the beam-energy dependence of anisotropic flow can provide important constraints for initial state models and for precision extraction of the chemical potential ($\mu_B$) and temperature ($T$) dependence of the QCD matter, specific shear viscosity $\eta/s$. It has been predicted that the $\mu_B$ and $T$ dependence on $\eta/s$ could be sensitive to the critical endpoint (CEP) in the QCD matter phase diagram\cite{Laszlo}. We will present and discuss recent RHIC measurements of the anisotropic flow coefficients $v_{n}$ ($1\leq n \leq 5$) as a function of harmonic number ($n$), transverse momentum ($p_T$), and centrality in Au$+$Au collisions across the full span of BES-I energies ($7.7 - 200$~GeV). The implication of these measurements for understanding the medium properties will be discussed.

Speaker: Niseem Magdy

Niseem-DPF-Talk_ana.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

195 Results on Lepton Flavor Universality Tests at LHCb

Decays of $b$ hadrons provide a powerful probe for new physics effects that may violate the Standard Model's paradigm of Lepton Flavor Universality, whereby the three charged lepton flavors are distinguished only by their differing masses. A definitive observation of a deviation from the predictions of LFU would provide unambiguous evidence of new physics. A recent history of results showing consistent but individually not significant tension has brought close attention to these modes. I will review the methods and results of recent measurements by LHCb in semileptonic $b \to c \ell \nu$ and rare $b \to s \ell \ell$ decays which are of interest in this context,and discuss future prospects for the LHCb program in this area.

Speaker: Dr Phoebe Hamilton (University of Maryland (US))

Hamilton-DPFtalk.pdf

196 An EFT look at LFUV in $b \to s \ell^{+} \ell^{-} $

We present a state-of-the-art picture of the imprints of New Physics in $b \to s \ell^{+} \ell^{−}$ transitions in light of the most recent experimental updates on lepton-universality tests of the Standard Model in this channel from the LHCb and Belle collaborations. We make use of the language of effective field theories in order to characterize a model-independent study of New Physics effects in this class of semileptonic $B$ decays. In particular, we explore New Physics solutions to current $b \to s$ anomalies both from the bottom-up point of view of the standard Weak Effective Hamiltonian, and from the perspective of the Standard Model Effective Field Theory, where correlations in the short-distance physics driven by Standard Model gauge invariance arise. In both theoretical frameworks, we single out New Physics scenarios preferred by current data within a careful treatment of hadronic uncertainties. We finally comment on possible future improvements for a conservative assessment of such New Physics effects in $b \to s \ell^{+} \ell^{-}$ transitions.

Speaker: Mauro Valli (University of California, Irvine)

MV_btosll_DPF_APS_19.pdf

197 Reducing Uncertainties in B to X_s gamma Decay

The rare inclusive decay $\bar{B}\rightarrow X_s\gamma$ is an important probe of physics beyond the standard model. The largest uncertainty on the decay rate and CP asymmetry comes from resolved photon contributions. They first appear at order $1/m_b$ in the heavy quark expansion and arise from operators other than $Q_{7\gamma}$. One of the three leading contributions in the heavy quark expansion, $Q_1^q-Q_{7\gamma}$ is described by a non-local function whose moments are related to HQET parameters. We use recent progress in our knowledge of these parameters to better constrain the resolved photon contribution to $\bar{B}\rightarrow X_s\gamma$ total rate and CP asymmetry.

Speaker: Ayesh Gunawardana (Wayne State University)

Ayesh Gunawardana DPF 2019.pdf

198 Update on Semileptonic Decays via Lattice QCD

This talk will report recent results from ongoing lattice-QCD calculations of semileptonic decays from the Fermilab Lattice and MILC collaborations. The focus of the talk will be on heavy-to-light decays (D/B to K/$\pi$). These calculations play an essential role in determining CKM matrix elements (in particular, $|V_{us}|$, $|V_{cd}|$, and $|V_{ub}|$). They are also important for constraining flavor-changing-neutral-current processes that are currently in tension with the Standard Model.

Speaker: Dr William Jay (Fermi National Accelerator Laboratory)

wjay_dpf_boston_2019.pdf

199 Determination of $b$-quark pole mass and \MSbar running mass from H1 and ZEUS beauty vertex production data

The beauty-quark is one of the kinematically accessible heavy-quark at HERA. Measurements of open $b$-quark production in deep inelastic scattering (DIS) of ${e^\pm}p$ at HERA provide important test of perturbative Quantum Chromo Dynamics (pQCD) theory within the Standard Model and is used to constrain proton parton distribution functions (PDFs). In this contribution we attempt to determine the $b$-quark pole mass and \MSbar running mass, using H1, ZEUS and (H1 $+$ ZEUS) ${F_2^{b\overline{b}}}$ beauty vertex production data sets and then we investigate the role and influence of beauty-quark mass as an extra free degree of freedom in the next-to-leading order (NLO) pQCD framework on the improvement of the uncertainty band of gluon distribution. We show the consistency of our numerical results for $b$-quark pole mass and \MSbar running mass with pQCD theory predictions are more than $99.90$~\%~, $99.95$~\%~and $99.96$~\% corresponding to H1, ZEUS and (H1 $+$ ZEUS) ${F_2^{b\overline{b}}}$ beauty vertex production data, respectively. Also, we obtain up to $0.7$~\% improvement in the fit quality for determination of $b$-quark \MSbar running mass relative to $b$-quark pole mass based on (H1 $+$ ZEUS) ${F_2^{b\overline{b}}}$ beauty vertex production data.

Speaker: Mr Alireza B. Shokouhi (Shahid Beheshti University)

200 CANCELED Semileptonic $B$ decays

Semileptonic $b$-hadron decays provide a laboratory to measure the CKM matrix element $|Vcb|$, as well as test lepton flavor universality violation (LFUV) via the $R(D^{(*)})$ ratios. Measurements of the former exhibit low values that are in tension with inclusive $|V_{cb}|$ measurements, while persistent LFUV signals are observed above the 3 sigma level. This talk provides a survey of recent theoretical developments crucial to both measurements and theoretical predictions, including: the role of form factor parametrizations and truncation orders; convergence of the heavy quark expansion, in particular new results from the theoretically cleaner $\Lambda_b$ baryon decay processes; and important caveats to NP interpretations of the LFUV anomalies, as well as the systematic strategies being developed to resolve them.

Speaker: Dean Robinson (UC Santa Cruz/ LBL)

dpf19.pdf

Social Program: Conference Banquet

During the Tuesday Banquet at the MFA, we will recognize the 2018 APS Fellowship recipients.

Wednesday, 31 July

Plenary Sessions: Wednesday Morning 1

Convener: Darien Wood (Northeastern University (US))

201 Precision Electroweak, Top, and Higgs at LHC

Speaker: Keti Kaadze (Kansas State University (US))

KetiKaadze_DPF2019.pdf

202 What don't we know about the Higgs boson?

Speaker: Ian Low (Argonne National Lab/Northwestern Univ)

Low_DPF2019.pdf

203 Frontiers of Perturbative QCD

Speaker: Prof. Frank Petriello (Northwestern University and Argonne National Lab)

petriello-DPF2019.pdf

204 LHC Results on BSM

Speaker: Maximilian J Swiatlowski (University of Chicago (US))

swiatlow_lhc_bsm_final_builds.pdf

swiatlow_lhc_bsm_final_nobuilds.pdf

205 Theory Perspectives on Particle Searches at LHC

Speaker: Adam Orion Martin (University of Notre Dame (US))

DPF_AMartin_2019.pdf

10:30 Coffee Break

Plenary Sessions: Wednesday Morning 2

Convener: Kate Scholberg (Duke University)

206 Neutrino Theory: What are the important questions?

Speaker: Irina Mocioiu (Pennsylvania State University)

mocioiu_dpf_19.pdf

207 Long-baseline Accelerator Neutrinos

Speaker: Louise Suter (Fermi National Accelerator Laboratory)

DPF_LBL_Suter.pdf

208 Short-baseline Neutrinos

Speaker: Roxanne Guenette (Harvard University)

DPF_SBL_Guenette.pdf

209 Neutrinoless Double-beta Decay & Direct Mass Measurements

Speaker: Yury Kolomensky (UC Berkeley/LBNL)

09_Wed_DBD_NuMass_DPF2019_Kolomensky.pdf

210 DPF2019 Wed Remarks

Speakers: Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

Day3_remarks.pdf

Lunch Time Sessions: Career Panel Discussion

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Corrinne Mills (University of Illinois at Chicago (US))

211 Career Panel Discussion: Meet the Panelists

Speakers: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Corrinne Mills (University of Illinois at Chicago (US))

dpf2019careerpanel.pdf

Astroparticles & CMB

Conveners: Kerstin Perez (MIT), Laura Newburgh, Lindsey Bleem (Argonne National Laboratory)

Beyond Standard Model: BSM & DM Joint Session: Dark Matter at Accelerators

parallel sessions

Conveners: Benjamin Safdi, Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University), Stefania Gori (UC Santa Cruz), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US))

212 Searches for invisible Higgs decays with the ATLAS detector

The total decay width of the Higgs has not yet been constrained precisely, which allows for up to 30% of the branching fraction to be from beyond the standard model decays. If sufficiently light, dark matter motivates a decay of the Higgs to invisible final states. This talk will discuss searches for invisible decays of the Higgs produced in all production modes in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector, with a particular emphasis on the vector boson fusion, the most sensitive search channel. The statical combination of the different channels as well as a comparison between these searches and the constraints from the visible decay modes will be addressed. Finally, these results will be compared to direct detection dark matter experiments, assuming the Higgs portal model.

Speaker: Othmane Rifki (Deutsches Elektronen-Synchrotron (DE))

HInvDPF2019.pdf

213 Broadening Dark Matter Searches at the LHC: Mono-X versus Darkonium Channels

Current searches for dark matter at the LHC focus on mono-X signatures where the production of dark matter in association with a Standard Model (SM) particle is considered. The simplest benchmark model involves a massive spin-1 mediator, the Z′ boson, between the dark matter χ and the SM. Limits derived from mono-X channels are most effective when the mediator can decay into two on-shell dark matter particles, i.e. when M(Z′)≳2Mχ. In this talk, I will be discussing how the experimental region can be broadened to include cases where the Z’ is considerably lighter than twice the dark matter mass. In this scenario, the Z′ mediates an effective long-range force between the dark matter, thereby facilitating the formation of a bound state as is common in many dark sector models, which we call ‘darkonium’. The darkonium becomes active when Mχ>M(Z′)*αeff, where αeff is the effective fine-structure constant in the dark sector. Moreover, the darkonium could decay back into SM quarks, without producing missing transverse momentum in the detector. Considering multijet final states, especially dijet resonance searches at the LHC, we reinterpret existing searches to constrain the simple Z′ benchmark beyond the region probed by mono-X searches. Assuming a baryonic Z′ mediator and a Dirac dark matter, direct detection bounds can be loosened by giving a small Majorana mass to the dark matter. We also consider the interplay between mono-X and darkonium channels at future high energy colliders, which is at the frontier of probing the model parameter space.

Speaker: Anirudh Krovi (Northwestern Univesity)

Anirudh_Krovi_broadening_dm_searches.pdf

214 Trigger-level searches for dark matter mediators with dijet final states using the ATLAS detector at the LHC

The ATLAS experiment at the Large Hadron Collider (LHC) has a broad and systematic search program for dark matter. Many models of dark matter predict a new particle that mediates the interaction between Standard Model particles and dark matter. If this mediator can be produced by colliding protons at the LHC, then it should also decay to components of the proton, producing a dijet resonance signature in the detector.

With the unprecedented high luminosity delivered by the LHC, detector readout and data storage limitations restrict conventional dijet searches to resonance masses of about 1 TeV or higher. In order to extend the search range to lower masses on the order of 100 GeV and probe weaker couplings, the ATLAS experiment employs a range of novel trigger and analysis strategies. One of these is the trigger-level analysis (TLA), which records only trigger-level jet objects instead of the full detector information. This strategy of using only partial event information permits the use of lower jet trigger thresholds and increased recording rates with minimal impact on the total output bandwidth.

This talk will present the most recent results from the Run 2 djiet TLA search using these techniques and discuss extensions of the trigger-level analysis strategy.

Speaker: Emma Elizabeth Tolley (Ohio State University (US))

DPF_etolley.pdf

215 Virtual Higgs portal to new particles in a natural scenario with supersymmetry and non-supersymmetric WIMPs

Here we continue predictions for detection of new neutral and charged particles in a model which contains both supersymmetry and new non-supersymmetric particles from an extended Higgs sector [1-3]. The lowest energy of the new particles, which also have an R-parity of -1 [1], is an ideal dark matter WIMP with a mass $\leq$ 125 GeV/c$^2$ [2]. All the new non-susy particles couple to standard model particles via the Higgs [3], with a strength that is comparable to that of mixed higgsino-bino neutralinos [4]. They are therefore viable candidates for observation in direct, indirect, and collider detection. In particular, it would be interesting (if possible) to extend the collider search for real Higgs $\rightarrow$ pair of WIMPS (with a limit of 60 GeV for the possible WIMP mass) to analyses based on virtual Higgs $\rightarrow$ WIMP pair (to explore the range up to 125 GeV for the WIMP proposed here and in Refs. 1-3). With dark matter explained by the present non-susy candidate, the tension between the LHC limits and natural susy models [5] is relieved. In addition, there is a plethora of new predicted neutral and charged particles, as well as the well-known superpartners.

1. R. E. Allen and A. Saha, ''Dark matter candidate with well-defined mass and couplings'', Mod. Phys. Lett. A 32, 1730022 (2017).
2. R. E Allen, ''Saving supersymmetry and dark matter WIMPs — a new kind of dark matter candidate with well-defined mass and couplings”, Phys. Scr. 94, 014010 (2018).
3. M. Throm, R. Thornberry, J. Killough, B.Sun, G. Abdulla, and
   R. E. Allen, “Two natural scenarios for dark matter particles coexisting with supersymmetry”, Mod. Phys. Lett. A 34, 1930001 (2019).
4. H. Baer and X. Tata, Weak Scale Supersymmetry: From Superfields to Scattering Events (Cambridge Univ. Press, 2006).
5. H. Baer, V. Barger, D. Mickelson, and M. Padeffke-Kirkland,
   ''SUSY models under siege: LHC constraints and
   electroweak fine-tuning'', Phys. Rev. D 89, 115019 (2014).

Speaker: Prof. Roland Allen (Texas A&M University)

Allen-DPF-2MB.pdf

216 Dark Matter searches with the ATLAS Detector

The presence of a non-baryonic dark matter component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model it would be produced at the LHC, escaping the detector and leaving a large missing transverse momentum as its signature. The ATLAS detector has developed a broad and systematic search program for dark matter production in LHC collisions. Recent results of these searches on 13 TeV $pp$ data, along with the challenges and possible evolution of the search program, including prospects for the HL-LHC, will be presented.

Speaker: Rachel Christine Rosten (The Barcelona Institute of Science and Technology (BIST) (ES))

2019_07_31_ATLAS_DM.pdf

Computing, Analysis Tools, & Data Handling

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Peter Onyisi (University of Texas at Austin (US))

217 ACTS: a common track reconstruction software

The reconstruction of charged particles’ trajectories plays a crucial role to achieve the research goals of high energy physics experiments. While track reconstruction is one of the most complex and CPU consuming parts of the full data processing chain, the performance of ATLAS' track reconstruction software has gone through stringent tests in the dense environment at the LHC. To greatly increase the sensitivity to new physics, the LHC will enter the High-Luminosity LHC (HL-LHC) era in the middle of 2026. To preserve tracking performance in the much more dense environment with up to 200 simultaneous collisions at the HL-LHC, concurrent algorithms need to be developed to exploit modern computing architectures with many cores and accelerators. Careful handling of detector event and conditions data are required to support multithreaded execution chains aimed at minimising the memory footprint per core.

The ACTS project aims to encapsulate the well-tested and high-performance tracking software from ATLAS experiment and provide a set of highly experiment-independent and framework-independent reconstruction tools for modern computing architectures. The core of ACTS is designed to be agnostic to the details of the detection technologies and magnetic field configuration. Plugins to convert different geometry description formats are provided to interface with other external tools. Implementation of tracking geometry is optimized for fast and efficient navigation throughout the detector geometry. Interfaces of tracking algorithms, e.g. seed finding and KalmanFitter are designed to be highly flexible to support customized implementations. The software has been fully tested for thread-safety to support parallel execution of the code and its data structures are optimized for vector operations to speed up linear algebra operations. It supports contextual detector conditions, which can include having multiple detector alignments or calibrations in memory with a minimal memory footprint.

In this talk, I will introduce the general goals of the ACTS project and the tracking reconstruction tools and interfaces already implemented in the ACTS software. Tracking features already achieved will be highlighted by demonstrating the performance with prototype detectors. Plans for future developments for the ACTS project will be discussed.

Speaker: Dr Xiaocong Ai (Physics Department, UC Berkeley)

DPF2019_ACTS_Xiaocong.pdf

218 Deep Learning for Event Reconstruction at DUNE

DUNE is the next-generation neutrino experiment will play a decisive role to measure neutrino CP violation and mass hierarchy. DUNE far detectors will use liquid argon time projection chamber (LArTPC) technology which provides an excellent spatial resolution, high neutrino detection efficiency, and superb background rejection. To successfully accomplish the role of DUNE, the reconstruction of neutrino event is crucial. However, precise reconstruction can be limited by missing energy, detector response, invisible energy, and hadron identities. To address these issues, we developed deep learning methods, Convolutional Neural Networks (CNNs), to reconstruct neutrino events directly from pixel images of interactions in the detector. In this talk, we will focus on developments of CNNs to reconstruct the neutrino energies and interaction vertices.

Speaker: Jianming Bian (University of California Irvine (US))

DUNEDLReco_DPF_08_31_2019.pdf

219 End-to-end particle and event identification at the Large Hadron Collider with CMS Open Data

From particle identification to the discovery of the Higgs boson, deep learning algorithms have become an increasingly important tool for data analysis at the Large Hadron Collider.
We present an innovative end-to-end deep learning approach for jet identification at the LHC. The method combines deep neural networks with low-level detector information, such as calorimeter energy deposits and tracking information, to build a discriminator to identify different particles. Using two physics examples as references: electron and photon discrimination and quark and gluon discrimination, we demonstrate the performance of the end-to-end approach using simulated events with full detector geometry available as CMS Open Data. We also offer insights into the importance of the information extracted from various sub-detectors and describe how end-to-end techniques can be extended to event-level classification using information from the whole detector.

Speaker: Emanuele Usai (Brown University (US))

E2E_Usai_APSDPF19.pdf

220 HEP.TrkX Charged Particle Tracking using Graph Neural Networks

To address the unprecedented scale of HL-LHC data, the HEP.TrkX project has been investigating a variety of machine learning approaches to particle track reconstruction. The most promising of these solutions, a graph neural network, processes the event as a graph that connects track measurements (detector hits corresponding to nodes) with candidate line segments between the hits (corresponding to edges). This architecture enables separate input features for edges and nodes, ultimately creating a hidden representation of the graph that is used to turn edges on and off, leaving only the edges that form tracks. Due to the large scale of this graph for an entire LHC event, we present new methods that allow the event graph to be scaled to a computationally reasonable size. We report the results of the graph neural network on the TrackML dataset, detailing the effectiveness of this model on event data with large pileup. Additionally, we propose post-processing methods that further refine the result of the graph neural network, ultimately synthesizing an end-to-end machine learning solution to particle track reconstruction.

Speaker: Xiangyang Ju (Lawrence Berkeley National Lab. (US))

20190731_xju_gnn_exa_tracking.pdf

DOE: Detector R&D

Convener: Helmut Marsiske (Unknown)

221 DOE Detector R&D Overview

Speaker: HELMUT MARSISKE (U.S. Department of Energy)

DPF2019_DetectorR&D_31jul2019.pdf

DPF Executive Committee: Program Committee Meeting - Open to All

Conveners: Prisca Cushman (University of Minnesota), Prisca Cushman (University of Minnesota (US)), Roger Rusack (University of Minnesota (US)), Tao Han (University of Pittsburgh)

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

222 Constraints on Axion Dark Matter from Searches for Radio Signals at Neutron Stars

Axions, which can solve the Strong CP problem, and axion-like particles (ALPs), which arise naturally in many models of high-scale physics, provide theoretically compelling dark matter candidates. Axions and ALPs which couple to photons have been shown to produce observable radio emission through their conversion to photons in the magnetospheres of neutron stars, providing a means of indirect detection. In this work, we analyze 8 hours of radio data collected at the Green Bank Telescope to place novel constraints on 𝜇eV axion dark matter. We also briefly discuss implications of dark matter substructure for this search strategy.

Speaker: Joshua Foster (University of Michigan)

Foster_DPF_2019.pdf

223 Recent Results of the Axion Dark Matter Experiment (ADMX)

The Axion Dark Matter Experiment (ADMX) is seeking to discover the axion particle as both a solution to the strong-CP puzzle of QCD and to the nature of dark matter. The apparatus consists of a frequency tune-able resonant microwave cavity immersed in a strong mechanical field at sub Kelvin temperatures and read out by quantum amplifiers. Recent results and future prospects at a sensitivity below the theoretical predictions will be given.

Speaker: Dr William Wester (Fermilab)

ADMX_DPF.pdf

224 CAPP-8TB: Search for Axion Dark Matter in a Mass Range of 6.62 to 7.04 μeV

The axion is a hypothetical particle proposed to solve the strong $CP$ problem, and also a candidate for dark matter. This non-relativistic particle in the galactic halo can be converted into a photon under a strong magnetic field and detected with a microwave resonant cavity. Relying on this detection method, many experiments have excluded some mass regions with certain sensitivities in terms of axion-photon coupling ($g_{a\gamma\gamma}$) for decades, but no axion dark matter has been discovered to date. CAPP-8TB is another axion haloscope experiment at IBS/CAPP designed to search for the axion in a mass range of 6.62 to 7.04 $\mu$eV. The experiment aims for the most sensitive axion dark matter search in this particular mass range with its first-phase sensitivity reaching the QCD axion band. In this presentation, we discuss the overview of the experiment, and present the first result. We also discuss an upgrade of the experiment to achieve higher sensitivity.

Speaker: Dr Soohyung Lee (Institute for basic Science (KR))

DPF2019_SoohyungLee.pdf

225 The Search for Low-Mass Axions with ABRACADABRA-10cm: Results from the First Run

The evidence for the existence of Dark Matter is well supported by many cosmological observations. Separately, long standing problems within the Standard Model point to new weakly interacting particles to help explain away unnatural fine-tunings. The axion was originally proposed to explain the Strong-CP problem, but was subsequently shown to be a strong candidate for explaining the Dark Matter abundance of the Universe. ABRACADABRA is a proposed experiment to search for ultralight axion Dark Matter, with a focus on the mass range $10^{−14} < m_a < 10^{−6}$ eV. We search for these axions and other axion like particles (ALPs) through a modification to Maxwell's equations, which cause strong magnetic fields to source weak oscillating electrical currents parallel to the field. In this talk, I will describe the working principle behind the ABRACADABRA experiment and present the first results from a prototype experiment called ABRACADABRA-10 cm that we have built and operated at MIT.

Speaker: Dr Jonathan Ouellet (Massachusetts Institute of Technology)

Results from the First Run of ABRACADABRA-10 cm

226 The Search for Low-Mass Axions with ABRACADABRA-10cm: Preparations for Run 2

The presence of dark matter provides some of the most tangible evidence for the existence of physics beyond the Standard Model. One compelling dark matter candidate is the axion, a light boson that was originally postulated as a solution to another outstanding issue, the strong CP problem in QCD. ABRACADABRA is an experimental program to search for sub-$\mu$eV axion and axion-like dark matter. It searches for axion-induced modifications to Maxwell’s equations with a toroidal magnet and quantum electronics. This talk will present preparations for the second run of the prototype detector, ABRACADABRA-10cm.

Speaker: Chiara Salemi (Massachusetts Institute of Technology)

salemi_dpf2019_large.pdf

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University (US)), Ashutosh Kotwal (Duke University), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

227 Measurements of gluon-gluon fusion and vector-boson fusion Higgs boson production cross-sections in the H→$WW^{∗}$→eνμν decay channel in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

Higgs boson production cross-sections in proton-proton collisions are measured in the H→$WW^∗$→eνμν decay channel. The results are obtained from a data sample corresponding to an integrated luminosity of 36.1 /fb from √s=13 TeV pp collisions recorded by the ATLAS detector at the LHC. The product of the $H→WW^∗$ branching fraction times the gluon-gluon fusion and vector-boson fusion cross-sections are measured to be 11.4$^{+1.2}_{-1.1}$(stat.)$^{+1.8}_{-1.7}$(syst.) pb and 0.50$^{+0.24}_{-0.22}$(stat.)±0.17(syst.) pb, respectively, in agreement with the Standard Model predictions.

Speaker: Yun-Ju Lu (National Tsing Hua University (TW))

DPF2019_HWW_Yun-Ju_Lu_20190731_v2_2.pdf

228 Reducing the Spurious Signal Systematic Uncertainty in Higgs to Diphoton Analyses in the ATLAS Experiment Using Gaussian Process Regression

The Run II dataset of $pp$ collisions at $\sqrt{s}=$ 13 TeV taken with the ATLAS detector has resulted in multiple Higgs Boson analyses in the diphoton decay channel. These analyses measure the continuum diphoton background by fitting an analytic function to sideband regions in data. With this estimation comes a so-called “spurious signal” systematic uncertainty, meant to account for mismodeling of the true background shape under the Higgs signal by the analytic function. This systematic uncertainty is typically measured using a background-only Monte Carlo sample. Despite the production of huge numbers of Monte Carlo events, limited yields in particular phase spaces can lead to large statistical fluctuations in the background sample, which may be measured as spurious signal. In this case, the systematic uncertainty is greatly inflated, and it no longer reflects the shape discrepancy it is meant to describe. One possible approach to bettering the spurious signal calculation is to use Gaussian Process Regression to effectively smooth out statistical fluctuations in the background-only sample. Initial studies of this approach show promising improvements to the spurious signal calculation.

Speaker: Rachel Jordan Hyneman (University of Michigan (US))

DPF_GPR_Hyy_SpuriousSig_Hyneman.pdf

229 Future prospects for Higgs physics at the LHC and beyond

The analysis of data collected by the CMS experiment at a collision energy of 13 TeV for the Run 2 provided confirmation of the existence of a Higgs boson with a mass of 125 GeV and all the measurements about its properties were found consistent with the Standard Model predictions. Nevertheless a full reality of the Higgs mechanism to give mass to the particles cold not be established wit the statistics of Run 2 data and at the same time the Run 2 data analysis opened a wide scenario for searches for physics beyond Standard Model, even in the Higgs sector. An upgrade program is planned for the LHC which will smoothly bring the luminosity up to or above 5x10^34cm^-2s^-1 sometimes after 2020, to possibly reach an integrated luminosity of 3000 fb-1 at the end of that decade. For this ultimate scenario, called Phase-2, when LHC will reach the High Luminosity phase (HL-LHC), the CMS detector will be upgraded to fully exploit the highly-demanding operating conditions and the delivered luminosity (giving up to 200 pileup events). Precision measurements in the Higgs sector are planned and prospective studies have been done in the last year to explore the CMS potential in the Higgs sector in the high luminosity scenario of the LHC. The latest results will be summarized in this seminar. In addition new future projects involving larger and more powerful accelerators would provide more precise measurements in the Higgs sector and shed light on the self-couplings of the Higgs boson and more, etc.; current studies will be briefly described

Speaker: Mario Pelliccioni (INFN Torino (IT))

dpf_HL_Higgs_2019.pdf

230 R-Parity Violating Supersymmetry and the 125 GeV Higgs signals

We study the impact of R-parity violating Supersymmetry (RPV SUSY) on the 125 GeV Higgs production and decay modes at the LHC. We assume a heavy SUSY spectrum with multi-TeV squarks and SU(2) scalar singlets as well as the decoupling limit in the SUSY Higgs sector. In this case the lightest CP-even Higgs is SM-like when R-parity is conserved. In contrast, we show that when R-parity violating interactions are added to the SUSY framework, significant deviations may occur in some production and decay channels of the 125 GeV Higgs-like state. Indeed, we assume a single-flavor (mostly third generation) Bilinear RPV (BRPV) interactions, which generate Higgs-sneutrino mixing, lepton-chargino mixing and neutrino-neutralino mixing, and find that notable deviations of ${\cal O}(20-30\%)$ may be expected in the Higgs signal strength observables in some channels, e.g., in $p p \to h \to \mu^+ \mu^-, \tau^+ \tau^-$. Moreover, we find that new and detectable signals associated with BRPV Higgs decays to gauginos, $h\rightarrow\nu_{\tau}\tilde{\chi}_{2}^{0}$ and $h\rightarrow\tau^{\pm}\chi_{2}^{\mp}$, may also arise in this scenario. These decays yield a typical signature of $h \to \tau^\pm \ell^\mp + {{\not\!\! E_T}}$ ($\ell =e,\mu,\tau$) and may also be accompanied by an ${\cal O}(20-30\%)$ enhancement in the di-photon signal $pp \to h \to \gamma \gamma$.
We also examine potential interesting signals of Trilinear R-parity violation (TRPV) interactions in the production and decays of the Higgs-sneutrino BRPV mixed state (assuming it is the 125 GeV scalar) and show that, in this case also, large deviations up to ${\cal O}(100\%)$ are expected in e.g., $p p \to h \to \mu^+ \mu^-, \tau^+ \tau^-$, which are sensitive to the BRPV$\times$TRPV couplings product.

Speaker: jonathan cohen (technion)

RPV_jonathan_y.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

231 Neutrino CP Violation with the ESSnuSB project

After measuring in 2012 a relatively large value of the neutrino mixing angle θ13, the door is now open to observe for the first time a possible CP violation in the leptonic sector. The measured value of θ13 also privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum. The sensitivity at this 2nd oscillation maximum is about three times higher than for the 1st oscillation maximum inducing a lower influence of systematic errors. Going to the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy. The world’s most intense pulsed spallation neutron source, the European Spallation Source, will have a proton linac with 5 MW power and 2 GeV energy. This linac, under construction, also has the potential to become the proton driver of the world’s most intense neutrino beam with very high potential to discover a neutrino CP violation. The physics performance of that neutrino Super Beam in conjunction with a megaton underground Water Cherenkov neutrino detector installed at a distance of about 500 km from ESS has been evaluated. In addition, the choice of such detector will extent the physics program to proton–decay, atmospheric neutrinos and astrophysics searches. The ESS proton linac upgrades, the accumulator ring needed for proton pulse compression, the target station optimization and the physics potential are described. In addition to neutrinos, this facility will also produce at the same time a copious number of muons which could be used by a muon collider. The ESS neutron facility will be fully ready by 2023 at which moment the upgrades for the neutrino facility could start.
This project is now supported by the COST Action CA15139 "Combining forces for a novel European facility for neutrino-antineutrino symmetry-violation discovery" (EuroNuNet). It has also received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419.

Speaker: Dr Marcos Dracos (Centre National de la Recherche Scientifique (FR))

Dracos_Boston.pdf

232 Physics Goals of the IsoDAR Electron Antineutrino Experiment

The Isotope Decay-At-Rest (IsoDAR) experiment is a compact accelerator-based source for anti-electron neutrinos produced through Lithium-8 decay. Paired with a kiloton scale detector, IsoDAR will be able to precisely measure neutrino oscillations over an L/E of approximately 0.6-7.0 m/MeV. IsoDAr will be able to decisively test the current global allowed region for the sterile neutrino hypothesis as well as distinguish between a 3+1 and 3+2 model. IsoDAR will also collect the world’s largest sample of low energy electron-antineutrino on electron scattering events that can be used to make precision electroweak measurements and new physics searches. This talk will discuss the physics goals of the experiment as well as other beyond Standard Model precision measurements that can be performed. There will also be a brief review of the technical developments for the beam and neutrino source that are going on to enable this measurement.

Speaker: Mr Edward Dunton (Columbia University)

Physics Goals of the IsoDAR Neutrino Experiment.pdf

233 Physics with the Upgraded Super-K Detector

The next phase of observation with the Super-K detector will add gadolinium sulfate to the water in order to enhance neutron capture. We will present details on the detector modifications, started in mid-2018 and completed in 2019. The first tests with gadolinium are expected in early 2020. We will review the topics with enabled sensitivity from this upgrade, namely, supernova neutrinos, atmospheric neutrinos, and nucleon decay.

Speaker: Edward Kearns (Boston University)

Kearns-Super-K-DPF.pdf

234 The DUNE BSM Physics Program

The Deep Underground Neutrino Experiment (DUNE) is an international project for neutrino physics and proton-decay searches, currently in the design and planning stages. Once built, DUNE will consist of near and far detector sites exposed to the world’s most intense neutrino beam. The near detector will record neutrino interactions at Fermilab, near the beginning of the beamline. The other, much larger, detector, comprising four 10-kton fiducial mass liquid argon time projection chambers (TPCs), will be installed at a depth of 1.5 km at the Sanford Underground Research Facility in South Dakota, about 1300 km away from the neutrino source.
The unique combination of the high-intensity neutrino beam with DUNE's high-resolution near detector and massive LArTPC far detector enables a variety of probes of BSM physics, either novel or with unprecedented sensitivity, from the potential discovery of new particles (e.g. sterile neutrinos or dark matter), to precision tests of the three-flavour mixing paradigm, or the detailed study of rare processes (e.g. neutrino trident production). The talk will review these physics topics and discuss the prospects for their discovery at the DUNE experiment.

Speaker: Dr Justo Martin-Albo (Harvard University)

20190731 | DPF2019 | DUNE BSM Physics.pdf

235 New mechanism for light neutrino mass generation and its LHC signals

we revisit the dimension-7 neutrino mass generation mechanism based on the addition of an isospin 3/2 scalar quadruplet and two vectorlike isotriplet leptons to the standard model. We discuss the LHC phenomenology of the charged scalars of this model, complemented by the electroweak precision and lepton flavor violation constraints. We pay particular attention to the triply charged and doubly charged components. We focus on the same-sign-trilepton signatures originating from the triply charged scalars and find a discovery reach of 600–950 GeV at 3  ab−1 of integrated luminosity at the LHC. Strong constraints on the model parameter space can arise from the measured decay rate of the standard model Higgs to a pair of photons as well.

Speaker: Prof. Satyanarayan Nandi (Oklahoma State University)

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

236 A Cosmic Ray Veto Detector for the Mu2e Experiment at Fermila

The Mu2e experiment is designed to search for the charged-lepton-flavor-violating
process, $\mu^-$ to a $e^-$, with unprecedented sensitivity. The single 105-MeV
electron that results from this process can be mimicked by cosmic-ray muons or their
products entering the detector. An active veto detector surrounding the apparatus
is used to detect incoming cosmic-ray muons. To reduce the backgrounds to the required
level it must have an average efficiency of 99.99\% and excellent hermeticity over a
large area. The detector consists of four layers of scintillator counters, each with
two embedded wavelength-shifting fibers, whose light is detected by silicon photomultipliers.
The design and expected performance of the cosmic ray veto detector will be described.

Speaker: Ralf Ehrlich (Fermi National Accelerator Laboratory)

The Mu2e CRV.pdf

The Mu2e CRV.pptx

237 A solar neutrino spacecraft detector

The NuSOL collaboration pursues the physics motivation and detector development for a neutrino detector in space. I will briefly present some of the physics motivation for detecting solar neutrinos at a distance of just a few solar radii from the sun. The environment close to the sun provides very different backgrounds from those present on Earth. I will also discuss some detector design considerations and initial simulations of a detector concept. The detector obviously needs to be much smaller than typical neutrino detectors on Earth. This is compensated for in the expected event rate by the increase in neutrino flux as the detector gets close to the sun. The smaller detector allows more freedom in design. For example dopants to scintillator in large Earth based neutrino detectors are limited by their availability and cost. The smaller detector volume of a neutrino detector space craft makes feasible higher concentrations of dopants or doping with elements that are not common enough to be used as dopants in kilo-ton scale detectors. On the other hand the space environment and launch provide challenges an Earth based detector does not encounter.

Speaker: Holger Meyer (Wichita State University)

DPF-NuSOL-detector-HM.pdf

238 Nano-tracking detector for neutrinoless double beta decay characterization

Many neutrino mass extensions to the standard model require the neutrino to be a Majorana fermion. If this is the case, the rare process of neutrinoless double beta decay is predicted with half lives greater than about 10^25 years. Many current and future experiments look for this decay by identifying a summed double beta energy at the Q value of the decay, but adding energy and angular measurements of the individual betas allows the underlying decay mechanism to be probed.

A novel nano-tracking detector based on a clever combination of thin film CdTe devices will be presented here. This tracker will have order 100 nm spatial resolution while measuring the energy deposition across the track length of electron recoils in the detector. This allows energy and angular correlation measurements of a potential neutrinoless double beta decay signal, as well as a unique background suppression capability. Deep learning algorithms will be used to reconstruct double beta signals and perform the correlation analyses, and will simultaneously allow clear distinction between double betas and single beta or gamma-induced electronic recoils.

The detector concept will be presented, along with preliminary studies to demonstrate its operation and the physics reach for neutrinoless double beta decay. By exploiting recoil discrimination, an array of these detectors can potentially probe beyond the inverted hierarchy to either follow the next generation of neutrinoless double beta decay experiments or to serve as a post-discovery characterization experiment.

Speaker: Ethan Brown

NanoTracker_E_Brown_DPF_2019.pdf

239 A High Pressure TPC with Optical Readout

Gas filled Time Projection Chambers (TPCs) can be used to study neutrino interactions at next generation long baseline neutrino oscillation experiments such as DUNE. These detectors have many advantages, particularly their low energy threshold and high angular efficiency. A High Pressure TPC (HPTPC) additionally allows the gas to serve as the neutrino interaction target with good interaction statistics, allowing new cross-section measurements to be made. Such precision probes of neutrino-nuclear interactions are essential to resolve discrepancies within the neutrino Monte Carlo event generators that will be used for experiments including DUNE.
A prototype HPTPC with optical readout has been commissioned in order to assess the feasibility of this technology for neutrino detection, and to perform new measurements of proton and pion scattering on gaseous argon. The TPC is embedded in a pressure vessel allowing gas pressures of up to 5 bar. Cameras are used to image the optical scintillation signal from the avalanche ionisation in the amplification stage. This allows measurement of the track coordinates in the plane perpendicular to the drift field. The charge signal induced by the same ionisation avalanches is read out from the three electrodes of the amplification stage, which are composed of un-segmented meshes.
The HPTPC prototype was operated in a test beam at the CERN PS. Interactions of low momentum protons (≤ 0.5 GeV/c) were measured on different argon mixtures. A dedicated off-axis technique was developed to obtain these lower energy protons from the higher energy T10 test beam.
In this talk we will present the current status of the proton-argon cross-section measurement and give an account of the HPTPC’s performance, including results of various calibration measurements. The data analysis is currently ongoing, which includes a combined analysis of the HPTPC and time of flight systems that were employed together during the beam test.
Currently the HPTPC’s mesh-based amplification region is being replaced by an ALICE TPC Outer ReadOut Chamber. This chamber will be tested in the high pressure vessel in order to establish the feasibility of using similar chambers for the DUNE near detector HPgTPC.

Speaker: Dr Abigail Waldron (Imperial College London)

A High Pressure TPC with Optical Readout

240 QPix Technology: Research and Development towards kiloTon scale pixelated LArTPC

Future long baseline neutrino experiments such as the Deep Underground Neutrino Experiment (DUNE) call for the deployment of multiple multi-kiloton scale liquid argon time projection chambers (LArTPCs). To date, two detector readout technologies are being studied in large-scale prototype detectors: the single phase (SP) and dual phase (DP) detectors using projective charge readout wire/strip based anode planes. These projective readout technologies come with a set of challenges in the construction of the anode planes, the continuous readout of the system required to accomplish the physics goals of proton decay searches and supernova neutrino sensitivity, and disambiguation in the 2D projective reconstruction of complex neutrino topologies.

The Q-Pix concept (arXiv: 1809.10213) provides a novel alternative, avoiding the challenges above, but requiring demonstration of perceived benfits. Q-Pix is based on a continuously integrating low-power charge-sensitive amplifier (CSA) coupled to a regenerative comparator with fixed threshold. The comparator resets the CSA when threshold is exceeded. The instant of reset time is captured with ~10 ns rms resolution. The value is buffered and the cycle then begins again. What is exploited in this new architecture is the time difference between one clock capture and the next sequential capture, called the Reset Time Difference (RTD). The RTD measures the time to integrate a predefined integrated charge (Q). An event is completely characterized by the RTD sequence, which is straightforwardly converted to a waveform. In quiescent mode the RTDs will be evenly spaced with time intervals of seconds between RTDs with an event signaled by the appearance of a sequence of varying µs RTDs. This technique easily distinguishes the background RTDs due to 39Ar decays (which also provide an automatic absolute charge calibration) and signal RTD sequences due to ionizing tracks. Q-Pix offers the ability to extract all useful track information with very detailed track profiles. A dynamically established network for DAQ is proposed for exceptional resilience against single point failures. This talk will present the Q-Pix concept and ongoing R&D to realize this technology

Speaker: Jonathan Asaadi

QPix_DPF2019_Asaadi.pdf

QCD & Heavy Ions

parallel sessions

Conveners: Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

241 Small Systems at RHIC

The observation of multiparticle correlations in Heavy Ion collisions have long been related to collective behaviour in the formed medium. Recent results both at RHIC and LHC provide strong arguments for the formation of such medium in smaller systems.
RHIC has a broad program to study the physics of small systems by systematically varying its size and energy for a better understanding of the underlying physics. In this talk, I present a summary of the results obtained from small systems collisions at RHIC energies.

Speaker: Dr Carlos Eugenio Perez Lara (Stony Brook University)

DPF19_cperez.pdf

242 Entanglement, Quantum Tomography, and All That: Why It's Happening in QCD

Entanglement and related subjects of quantum information science have become a hot topic in QCD. We review how and why this comes from a new point of view with fresh opportunities for experimental and theoretical investigation. The early history of QCD was dominated by makeshift models and case-by-case perturbative calculations. We now have new organizing principles and experimental procedures that bypass model-dependent assumptions and make data analysis tremendously efficient. The new approach exploits the fundamentals of quantum mechanics in a way that is maximally effective for inclusive reactions. Separabilty is a simple criterion of entanglement that explains factorization and its limitations. We illustrate the power of quantum tomography with practical data analyses that go directly from experimental 4-vectors to inclusive observables.

Speakers: Prof. John Ralston (University of Kansas), John Ralston (The University of Kansas (US))

DPF2019Ralston1.pdf

243 An overview of heavy-ion physics in small collision systems at the LHC

Studies of small collision systems are essential to our understanding of the physics of strongly interacting matter at high temperatures. Proton-proton and proton-lead collisions with high particle multiplicities exhibit striking similarities to large nucleus-nucleus collisions, including apparent collective motion, quarkonium suppression, and similar hadrochemistry. An overview of recent measurements of small collision systems at the LHC experiments will be presented. The evolution of these observables from the lowest to highest multiplicities will be discussed and their impact on our understanding of heavy-ion physics will be explored.

Speaker: Anders Garritt Knospe (University of Houston (US))

Knospe190731v3.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

244 Progress in lattice QCD for B physics

B physics is in an exciting era. The LHCb and Belle II experiments are reaching unprecedented precision and are providing new opportunities for discovering physics beyond the Standard Model. To connect the hadronic processes observed in the experiments to the underlying short-distance physics, lattice QCD calculations are essential. I will discuss recent progress and future prospects for B physics on the lattice. This includes both improvements in the precision of established observables and first calculations of more complex observables.

Speaker: Prof. Stefan Meinel (University of Arizona / RIKEN BNL Research Center)

DPF2019_Meinel.pdf

245 Belle II Commissioning, First Results, and Future Prospects

The Belle II experiment has begun its main physics running with a fully instrumented detector in Tsukuba, Japan. With the SuperKEKB asymmetric-energy e$^+$e$^-$ collider producing collisions with an ultimate design luminosity of 8 $\times 10^{35}\,$cm$^{-2}\,$s$^{-1}$ and a planned $50\,$ab$^{-1}$ data set, the Belle II/SuperKEKB facility is poised to become the world's first Super B Factory. Belle II plans to perform a broad range of high precision measurements in flavor physics while also exploring hints of new physics along with a robust program for dark matter searches. This talk will present the results of the commissioning stages performed to prepare for long-term running in a challenging high-luminosity environment, first results from the Belle II physics program, and future prospects.

Speaker: Zachary Liptak (University of Hawaii)

DPF_19_Liptak.pdf

246 LHCb upgrades I and II

Since 2010, the LHCb experiment at CERN has been accumulating 1-2 $fb^{-1}$ of 7-13 TeV pp collision data every year. This b- and c-hadron rich data sample, together with the detector’s excellent performance, has allowed LHCb to carry out world leading measurements in the field of flavor physics. Many of these results, however, will benefit from significantly larger data samples, and that is what LHCb's Upgrade I aims to achieve. Between 2019 and 2020, three completely new trackers as well as a more powerful readout electronics will be installed. As a result, the experiment will be able to read out the collision data at the unprecedented rate of 30 MHz, with all trigger decisions performed at the software level. The data collection will increase to about 5 $fb^{-1}$ a year. A further upgrade in 2030 aims to increase the annual integrated luminosity to about 50 $fb^{-1}$. In this talk I will go over the main technological challenges being overcome to make these upgrades possible as well as a brief overview of what new physics opportunities will open up thanks to the orders-of-magnitude-larger data samples.

Speaker: Manuel Franco Sevilla (University of Maryland (US))

19-07-31_manuelf_lhcb_upgrades_dpf.pdf

247 The UT silicon tracker for LHCb's Upgrade I

A key part of the LHCb charged particle tracking system is the silicon detector (UT) placed after the VErtex LOcator and before the dipole magnet. Its main function is to make a quick measurement on the momentum of tracks using the small magnetic field between the VELO and the UT. The fully software trigger is consequently sped up by a factor of three. Also of prime importance is the rejection of a large fraction of ghost tracks during the full reconstruction. Many physics results depend on the proper implementation of this detector. Novel features including internal pitch adapters and high voltage feed-throughs in the silicon. Construction techniques will be described.

Speaker: Ivan Polyakov (ITEP Institute for Theoretical and Experimental Physics (RU))

Boston_UT_v3 (1).pdf

15:30 Coffee Break

Accelerators

Parallel Sessions

Conveners: Patric Muggli (Max Planck Institute for Physics), Silvia Verdú Andrés (Brookhaven National Laboratory BNL), Vladimir Shiltsev (Fermilab)

248 IsoDAR: Neutrino Physics Using a High Current Cyclotron

Sterile neutrinos, hypothetical particles that do not interact through the weak force, have been proposed as an explanation for anomalies seen in short baseline neutrino oscillation experiments. Global data fits have constrained the allowed parameter space for sterile neutrinos but a definitive experiment is still needed. IsoDAR (Isotope Decay-At-Rest) will be able to cover the allowed regions for sterile neutrinos at 5σ in 5 years of running. The novelty of IsoDAR is the construction of a pure anti-neutrino source near a kiloton scale detector. IsoDAR will produce an isotropic beam of $\bar{ν}_e$ through protons impinging on a $^9$Be target to produce neutrons. The neutrons are captured by a surrounding sleeve of isotopically purified $^7$Li, yielding $^8$Li. $^8$Li quickly $\beta$-decays at rest, supplying the $\bar{\nu}_e$. In order to reach the desired statistics, IsoDAR requires 10 mA of 60 MeV protons on target. The high proton current will come from a compact cyclotron accelerating H$_2^+$ ions. The ions will be injected via RFQ from a multi-cusp source, currently being commissioned at MIT. The target, sleeve, and shielding are being designed to handle the high-power beam and large neutron flux. IsoDAR is also able to collect the largest data sample to date of e-$\bar{ν}_e$ elastic-scattering events, allowing for precision measurement of axial and vector weak couplings with sensitivity to non-standard interactions. In addition to the initial IsoDAR experiment, these cyclotrons have other uses; two examples are looking for cp-violation in the DAEδALUS experiment and opening new possibilities in medical isotope production.

Speaker: Joseph Smolsky (Massachusetts Institute of Technology)

IsoDAR_cyclotron.pdf

IsoDAR_cyclotron.pptx

249 A Beam-Based Production Target Monitor for the Mu2e Experiment at Fermilab

Mu2e is an experiment currently under construction at Fermilab, which will search for coherent neutrinoless conversion of muons to electrons in the presence of an atomic nucleus. In order to maximize the number of stopped muons for conversion, Mu2e must ensure optimal pion production in the production solenoid, by aligning the proton beam with the production target to within $\pm$ 0.5 mm. However, the target cannot be instrumented directly, because any additional material in the production region can reabsorb pions. Additionally, the target will be at a high temperature, highly activated, and kept in a vacuum of $10^{-5}$ torr, due to being radiation-cooled. The production region will also be under a strong magnetic field with a steep gradient produced by a superconducting solenoid, which requires heavy shielding around the target to protect the coils from heat and radiation. Given this harsh and complicated environment for the target, we chose to design a beam-based production target monitoring system which uses multi-wire proportional chambers outside the target’s harsh environment to align the beam with the target.

Speaker: Helenka Casler (City University of New York / York College campus)

Casler_DPF2019.pdf

250 The High Intensity Muon Beam project at PSI

Meson factories are powerful drivers of diverse physics programs and play a major role in particle physics at the intensity frontiers.

Currently PSI delivers the most intense continuous muon beam in the world up to few 10^8 μ+/s. The High Intensity Muon Beam (HiMB) project at PSI aims at developing new muon beam lines able to deliver up to 10^10 μ+/s. While next generation of proton drivers with beam powers in excess of the current limit of 1.4 MW still requires significant research, the focus of HiMB is the optimisation of existing target stations and beam lines. Detailed Monte Carlo simulations show that geometrical target optimisations would imply beam intensity gains in the range of 30-60%, that could be further increased by using novel target materials such as boron carbide. Higher muon capture and transmission beam line efficiencies can be obtained with the design of a beam line optics based on pure solenoid elements. The expectation is an increase of the total fraction of captured and transmitted muons by more than one order of magnitude with respect to the current hybrid beam lines.

The target optimisation only would corresponds to effectively raising the proton beam power at PSI by 650 kW, that added to the 1.4 MW would be equivalent to a total proton beam power of almost 2 MW without additional complications such an increased energy and radiation deposition into the target and its surroundings.
Taking also into account the beam line optimisation the equivalent proton beam power would be of order of several tens of MW, an astonishing value.

This year the new production target (the so called slanted Target E) will be installed and tested along the primary beam line at PSI. The status of the project will be reported in detail.

Speaker: Angela Papa (PSI and UniPi/INFN)

Papa_HiMB_APS2019.pdf

251 Progress on Muon Ionization Cooling Demonstration with MICE

The Muon Ionization Cooling Experiment (MICE) at RAL has collected extensive data to study the ionization cooling of muons. Several million individual particle tracks have been recorded passing through a series of focusing magnets in a number of different configurations and a liquid hydrogen or lithium hydride absorber. Measurement of the tracksupstream and downstream of the absorber has shown the expected effects of the 4D emittance reduction. Further studies are providing now more and deeper insight.

Speaker: Mark Palmer (BNL)

MICE_Palmer_2019_0731.pdf

MICE_Palmer_2019_0731.pptx

252 MU*STAR: A MODULAR ACCELERATOR-DRIVEN SUBCRITICAL REACTOR DESIGN

Mu*STAR is an accelerator-driven molten-salt subcritical reactor based on recent superconducting RF technological breakthroughs that allow a highly efficient and powerful proton accelerator to drive a spallation target inside a graphite-moderated, thermal-spectrum reactor. The additional spallation neutrons can be used to overcome the absorption of neutrons by fission products to allow a deeper burn than is possible with critical reactor designs. Simulations have shown that as much as seven times the energy that was extracted from used fuel from light water reactors can be produced by this method before the accelerator demands significant power from the reactor. Once the fuel rods have been converted from oxide ceramics to fluoride salts, in a process that is proliferation resistant (not chemical reprocessing), the fuel can be burned for centuries without increasing its volume while reducing its radio-toxicity.

Speaker: Prof. Mary Anne Cummings (Muons, Inc.)

Cummings_MuSTAR.pdf

Astroparticles & CMB

Conveners: Kerstin Perez (MIT), Laura Newburgh, Lindsey Bleem (Argonne National Laboratory)

253 Status and Science Goals of the Simons Array

The Simons Array (SA) experiment is a set of three millimeter-wave telescopes designed for polarimetry, including measurements of the polarization of the cosmic microwave background (CMB) anisotropies, from an altitude of 5200 m in the Atacama Desert in Chile. Each of the three telescopes features a receiver with sufficient stability to study large angular scales, sufficient resolution to recover the polarization signal generated by gravitational lensing of the CMB, and sufficient sensitivity to further constrain the possible polarization anisotropy signal sourced by primordial tensor perturbations. We achieve these requirements with achromatic, continuously-rotating half-wave plates to modulate incoming polarization, a 3 m effective aperture for the off-axis Gregorian telescopes, and high-density focal-plane arrays with thousands of multichroic pixels. These technologies build on the heritage of the POLARBEAR telescope and receiver. The receivers on the first two telescopes, POLARBEAR 2-a (PB-2a) and PB-2b, will observe the sky in bands centered at 90 GHz and 150 GHz. The final receiver, PB-2c, will constrain dust foreground signals by observing in bands centered at 220 GHz and 270 GHz.

In this talk, I will discuss the scientific impact of future SA observations, including their sensitivity to primordial tensor perturbations, the sum of the neutrino masses, and sources of cosmic birefringence. To add to discussion of these goals, specifically the expected sensitivity of SA at large angular scales when using a half-wave plate, I will briefly discuss the results of a study of POLARBEAR data at large angular scales. I will then present the status of all three SA receivers, including early data recorded in the field with PB-2a, results from laboratory commissioning of the PB-2b receiver, and updates on the performance of PB-2c.

Speaker: Dr Kevin T. Crowley (University of California, Berkeley)

20190731_APS_DPF_SA_science_status_final.pdf

254 BICEP/Keck: Constraining the primordial gravitational-wave signal with CMB polarization observations from the South Pole

Theories of inflation generically predict the existence of primordial gravitational waves over a wide range of amplitudes. Currently the most promising pathway for constraining inflationary gravitational waves is to search for the imprint these tensor perturbations would leave on the cosmic microwave background (CMB) as a B-mode polarization pattern. The BICEP/Keck experiments target this primordial signature by observing the polarized microwave sky at degree-scale resolution from the South Pole. Attempting to observe the very faint primordial B-mode signal requires an instrument with exquisite sensitivity and tight control of systematics. Bright Galactic emission at the same observing frequencies, along with polarization distortion due to gravitational lensing of CMB photons by large-scale structure, make this measurement extremely challenging. Distinguishing the primordial signal from these “foregrounds” requires a wide frequency coverage. I will present the latest constraints on the tensor-to-scalar ratio “r" from the BICEP/Keck experiments, using data taken from 2010 up to 2015 (BK15) in combination with data from the Planck and WMAP satellites. Future observations with the “Stage-3” BICEP Array experiment will expand in frequency range, steadily improving our sensitivity to r by an order of magnitude over the next few years and thus constraining natural inflation and most single-field models. Finally, I will outline how these efforts inform CMB "Stage 4” experiments, which will also probe the thermal history of our Universe, investigate Dark energy and general relativity, and study neutrino properties.

Speaker: Dr Marion Dierickx (Harvard-Smithsonian Center for Astrophysics)

APS_072919_v3.pdf

255 Status and Science from the SPT-3G Cosmic Microwave Background Receiver

SPT-3G is a third generation camera for the 10-meter diameter South Pole Telescope (SPT), which is designed to measure the cosmic microwave background (CMB). SPT-3G began a 6-year 1500 square degree survey in February 2018, which will produce measurements of CMB temperature and polarization anisotropies with an unprecedented combination of angular resolution and sensitivity. These measurements will enable a broad range of cosmological studies including searching for inflationary gravitational waves, constraining the mass of the neutrino, constraining the energy density of light relativistic species, and characterizing the properties of dark energy through its effect on the growth of structure via galaxy clusters. In this talk, I will summarize the status of the survey, highlight the science goals and projected constraints, and describe preliminary results.

Speaker: Mr Zhaodi Pan (The University of Chicago)

DPF_zhaodi.pdf

256 A Bayesian approach for detecting Isotropy violation in the CMB sky

Even though the standard model of cosmology predicts a statistically isotropic (SI) CMB sky, the SI violation signals are always present in an observed sky-map. Given a completely statistically isotropic CMB, different cosmological artifacts, measurement effects and unavoidable effects during data analysis etc. may lead to isotropy violation signals in an otherwise SI sky. Therefore, a proper data analysis technique should account for all these SI violation signals. It will help us to match the SI violation signals in the sky with the known isotropy violation signals and then conclude if there is any SI violation present in the intrinsic CMB sky.

We develop a software package, SIToolBox, for measuring the isotropy violation signals in the CMB sky in presence of anisotropic noise and masked sky using a completely Bayesian formalism. In this presentation I will discuss the formalism for measuring the isotropy violation in CMB sky and present the estimates of isotropy violation, Doppler boost and dipole modulation parameters etc. using SIToolBox in WMAP and Planck type of skymap.

Speaker: SANTANU DAS (University of Wisconsin-Madison)

SantanuDas_DPF2019.ppsx

SantanuDas_DPF2019.pptx

257 Constraining Cosmology with Galaxy Clusters Discovered by the South Pole Telescope

The abundance of massive galaxy clusters is a powerful cosmological probe as it depends sensitively upon both the expansion history of the universe and the growth of density fluctuations. To derive precision constraints with these systems a large and well-characterized sample of clusters is required. To produce such a sample, the 10-m South Pole Telescope has been used to conduct high-resolution cosmic microwave background surveys of approximately 1/8 of the sky from which clusters are identified via the Sunyaev- Zel’dovich (SZ) effect. In this talk I will discuss the three completed surveys that have imaged this sky area (the 2500-square-degree SPT-SZ survey, 500-square-deg SPTpol Survey, and 2700-square-degree SPTpol Extended Cluster Survey), the sample of over 1,000 SZ-selected clusters, and our progress in extracting cosmological constraints from these clusters. I will also highlight several multi-wavelength analyses of these systems using optical imaging data from Dark Energy Survey. The results presented in this talk will significantly improve with data from both the ongoing SPT-3G and future CMB-S4 surveys. These surveys will identify an order of magnitude more clusters than previous generation SZ surveys.

Speaker: Lindsey Bleem (Argonne National Laboratory)

DPF19_Bleem.pdf

258 Improving Constraints on Fundamental Physics Parameters with the Clustering of Sunyaev-Zeldovich Selected Galaxy Clusters

Next-generation probes of the cosmic microwave background will detect tens-to-hundreds of thousands of galaxy clusters through the Sunyaez-Zeldovich effect, providing a measurement of large-scale structure which offers new constraints on cosmology and fundamental physics. An often-used statistic for Sunyaev-Zeldovich cluster constraints is their abundance as a function of redshift, but as the number of clusters increases to $10^4$–$10^5$, higher order statistics such as the cluster power spectrum become viable probes. Using the Fisher formalism, we forecasted the cosmological constraints that can be obtained from the cluster power spectrum for two next-generation microwave background experiments, the Simons Observatory, and CMB Stage-4. We found that the inclusion of the power spectrum with cluster abundances will improve constraints by around 10–30%. In this talk I will overview the forecasting methodology, discuss the resulting constraints, and the implications they have on using the cluster power spectrum as a probe of cosmology and fundamental physics.

Speaker: Dylan Cromer (Cornell University)

dcromer.pdf

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Stefania Gori (UC Santa Cruz), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US))

259 Recent Results and Future Plans of the MoEDAL Experiment

MoEDAL is an LHC experiment designed to search for anomalously ionizing messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, which are predicted to exist in many models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV in 2015. Its physics program yields insights into such foundational questions as: are there extra dimensions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; and what is the nature of dark matter. We will present the results from the MoEDAL detector on magnetic monopole and highly ionizing electrically charged particle production. In conclusion, progress on the installation of MoEDAL’s MAPP (MoEDAL Apparatus for the detection of Penetrating Particles) sub-detector prototype will be briefly be discussed.

Speaker: Michael Staelens

APS-DPF 2019 Meeting MoEDAL Update v2.pdf

260 Status of the milliQan Experiment

The status of the milliQan experiment is discussed. milliQan is a proposed search for milli-charged particles produced at the LHC with expected sensitivity to charges of between 0.1e and 0.001e for masses in 0.1 - 100 GeV range. The proposed detector is an array of 4 stacks of 60 cm long plastic scintillator arrays read out by PMTs. It will be installed in an existing tunnel 33 m from the CMS interaction point at the LHC, with 17 m of rock shielding to suppress beam backgrounds. In the fall of 2017 a 1% scale “demonstrator” of the proposed detector was installed at the planned site in order to study the feasibility of the experiment, focusing on understanding various background sources such as radioactivity of materials, PMT dark current, cosmic rays, and beam induced backgrounds. In this talk I will discuss the general concept of the experiment, the results from the demonstrator, and the plan for the future

Speaker: Brian Francis (Ohio State University (US))

milliQan_dpf2019.pdf

261 Looking forward to New Physics: the FASER Experiment

New physics has traditionally been expected in the high-pT region at high-energy collider experiments. If new particles are light and weakly-coupled, however, this focus may be completely misguided: light particles are typically highly collimated around the beam line, allowing sensitive searches with small detectors, and even extremely weakly-coupled particles may be produced in large numbers there. Our recently approved new experiment, the ForwArd Search ExpeRiment, or FASER, will be placed downstream of the ATLAS interaction point in the unused service tunnel TI12 to operate concurrently with the LHC. FASER will complement the LHC's existing physics program and extend its discovery potential to a host of new particles, such as dark photons and axion-like particles. In this talk, we will describe FASER's location and discovery potential, the detector's layout and components, as well as the experiment's timeline.

Speaker: Felix Kling (University of California, Irvine)

FASER_DPF-2.pdf

262 SEARCH FOR EXOTIC DECAYS WITH NA62

The features of the NA62 experiment at the CERN SPS – high-intensity setup, trigger-system flexibility, high-frequency tracking of beam particles, redundant particle identification, and high-efficiency photon vetoes – make NA62 particularly suitable to search for long-lived, weakly-coupled particles within Beyond the Standard Model (BSM) physics, using kaon and pion decays as well as operating the experiment in dump mode.
The NA62 sensitivity for searches of Dark Photons, Heavy Neutral Leptons and Axion-Like Particles are presented, together with prospects for future data taking at the NA62 experiment.

Speaker: Roberta Volpe (UCLouvain (Belgium))

RVolpe_DPF2019exo.pdf

263 Search for displaced vertices of oppositely-charged leptons from decays of long-lived particles in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

A search for long-lived particles decaying to an oppositely-charged lepton pair, $\mu\mu$, $ee$, or $e\mu$?, is presented
using 32.8 fb$^{-1}$ of $pp$ collision data collected at $\sqrt{s}$ = 13 TeV by the ATLAS detector at the LHC.
Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced
from the primary pp interaction region. No lepton pairs with an invariant mass greater than 12 GeV are
observed, consistent with the background expectations derived from data. The result is interpreted in
a supersymmetric model in which the lightest neutralino, produced via squark-antisquark production,
decays to $\ell^+\ell'^-\nu (\ell = e, \mu)$ with a finite lifetime due to the presence of R-parity violating couplings.
Cross section limits are presented for specific squark and neutralino masses. For a 700 GeV squark,
neutralinos with mass of 50–500 GeV and proper mean lifetimes corresponding to $c\tau$? of 1 mm to 6 m
are excluded. For a 1.6 TeV squark, 3 mm to 1 m are excluded for 1.3 TeV neutralinos.

Speaker: Prof. K.K. Gan (The Ohio State University (US))

DPF2019_Gan.pdf

264 Searching for Lorentz violation in high-energy colliders

Lorentz violation has been a popular field in recent years in the search for new physics beyond the Standard Model. We present a general method to build all Lorentz-violating terms in gauge field theories, including ones involving operators of arbitrary mass dimension. Applying these results to two types of experiments in high-energy colliders, light-by-light scattering and deep-inelastic scattering, we extract first bounds on certain coefficients for Lorentz violation.

Speaker: Zonghao Li (Indiana University Bloomington)

Zonghao_DPF2019.pdf

Computing, Analysis Tools, & Data Handling

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Peter Onyisi (University of Texas at Austin (US))

265 Recent progress on Wire-Cell 3D imaging and tracking for LArTPC

The single-phase liquid argon time projection chamber (LArTPC) provides a large amount of detailed information in the form of fine-grained drifted ionization charge from particle traces. MicroBooNE is a 85 metric tonne single-phase LArTPC and the first detector taking data in the Short Baseline Neutrino (SBN) program, located at Fermilab, which will examine a rich assortment of physics topics, such as searches for a light sterile neutrino and measurements of neutrino-Argon interaction cross sections. A novel and generic tomographic event reconstruction paradigm, Wire-Cell, was developed in MicroBooNE. It incorporates the time, charge, wire plane geometry, and sparsity, connectivity information to reduce the ambiguity from wire readout and reconstructs the topology agnostic 3D image of ionization electrons. The principle and the performance of the Wire-Cell 3D imaging will be presented. The progress of the subsequent 3D tracking based on Wire-Cell 3D images will also be reported.

Speaker: Dr Hanyu Wei (Brookhaven National Laboratory)

DPF2019_WireCell_imaging_tracking_20190731.pdf

266 Simulating light in large volume detectors using Metropolis Light Transport

In gigaton scale neutrino detectors, such as the IceCube experiment, interaction products are detected by the Cherenkov radiation emitted by their passage through the detector medium. Simulating this propagation of light is traditionally approached through ray tracing. This is complicated by the sparsity of the detector: the vast majority of light rays are scattered and absorbed by the detector medium, with only a tiny fraction finding their way to a light sensitive element. In this presentation, I develop an alternative method, based on the Metropolis light transport algorithm used in the CGI industry. This method poses the problem as a classical path integral, and samples only the paths of light rays that end on a light sensitive element using a Markov chain Monte-Carlo. This yields a significant performance increase of up to 1000 times compared to ray tracing when simulating the timing distribution of light detected by a photo-sensitive element.

Speaker: Gabriel Collin

2019_dpf.pdf

267 Supervised learning of Photo-Electron counting in scintillator-based dark matter experiments

Many scintillator based detectors employ a set of photomultiplier tubes (PMT) to observe the scintillation light from potential signal and background events. It is important to be able to count the number of photo-electrons (PE) in the pulses observed in the PMTs, because the position and energy reconstruction of the events is directly related to how well the spatial distribution of the PEs in the PMTs as well as their total number might be measured. This task is challenging for fast scintillators, since the PEs often overlap each other in time. Standard Bayesian statistics methods are often used and this has been the method employed in analyzing the data from liquid argon experiments such as MiniCLEAN and DEAP. In this work, we show that for the MiniCLEAN detector it is possible to use a multi-layer perceptron to learn the number of PEs using only raw pulse features with better accuracy and precision than existing methods. This can even help to perform position reconstruction with better accuracy and precision, at least in some generic cases.

Speakers: Dr Kolahal Bhattacharya (Pacific Northwest National Laboratory), Kolahal Bhattacharya (Pacific Northwest National Laboratory)

Kolahal_DPF2019_1.pdf

268 Determination of CMS Barrel Test Beam Calorimeter Reponse Correction to Pion Beams with Convolutional Neural Networks

We investigate modern machine learning techniques to derive calibration for the combined CMS electromagnetic and hadronic calorimeter system. We use the dataset from a 2006 CMS test beam to measure the calorimeter responses to pion beams of various energies. The performance of the network is evaluated by studying the linearity of calibrated responses. A convolutional neural network approach is used to train on a range of beam momenta from $2$ to $200\ GeV/c$ and to apply the correction to the energy distribution.

Speaker: Daniel Li (Brown University (US))

Determination of CMS Barrel Test Beam Calorimeter Response.pdf

269 Fast detector modeling using machine learning algorithms

Accurately and computationally rapidly modeling stochastic detector response for complex LHC experiments involving many particles from multiple interaction points, up to 200 interactions per proton-proton crossing in the HL-LHC requires the development of novel techniques. A study aimed at finding a fast transformation from truth level physics objects to reconstructed detector level physics objects is presented. This study used Delphes fast simulation based on an LHC-like detector geometry for inputs for machine learning (ML) algorithms, i.e. feed-forward regression neural networks, generative adversarial networks, and variational autoencoders. These ML transfer algorithms, with sufficient optimizations could have a wide range of applications to improve current detector simulations including: improving phenomenological studies by using a better detector representation, increasing the speed of creating event samples that more accurately resemble the output from Geant4-based detector simulation programs, or even speeding up fast simulations based on parametric description of LHC detector responses.

Speaker: Walter Hopkins (Argonne National Laboratory (US))

Hopkins_truth2Reco.pdf

270 Electron Neutrino Energy Reconstruction with Convolutional Neural Network

NOvA is a long baseline neutrino oscillation experiment. It is optimized to measure νe appearance and νμ disappearance at the Far Detector in the νμ beam produced by the NuMI facility at Fermilab. NOvA uses a convolutional neural network(CVN) to identify neutrino events in two functionally identical liquid scintillator detectors. A different network, called “Prong-CVN”, has been used to classify reconstructed particles in each event as either lepton or hadron. Within each event, hits are clustered into prongs to recon- struct final state particles and these prongs form the input to this new classifier. Classified particle energies are then used as input to an electron neutrino energy estimator. Improving the resolution and systematic robustness of NOvA’s energy estimator will improve the sensitivity of the oscillation measurements. In this talk, I will present our methods to identify particles with Prong-CVN and the following approach to estimate νe energy for signal events.

Speaker: Shiqi Yu (ANL/IIT)

DPF_talk_version.pdf

DOE: Quantum Information Science

Convener: Lali Chatterjee (US Department of Energy)

271 DOE Quantum Information Science Overview

Speaker: Lali Chatterjee (US Department of Energy)

DPF HEP QIS talk 2019 July 30.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

272 Axion-like dark matter search using ferromagnetic toroids

We report on a laboratory-scale experiment searching for axion-like dark matter in the mass range from about 50 peV to several neV. The electromagnetic interaction between a background axion-like field and the azimuthal magnetization of a ferromagnetic toroid creates an oscillating axial magnetic field. We use SQUID magnetometers to search for this field. The apparatus is placed inside a liquid-helium cryostat and screened with two layers of superconducting material to prevent external electromagnetic interference. The current status and preliminary results of the experiment will be presented.

Speaker: Alexander Gramolin (Boston University)

Gramolin_DPF2017.pdf

273 Search for the Axion Dark Matter with the Cosmic Axion Spin Precession Experiment (CASPEr)

Cosmic Axion Spin Precession Experiment (CASPEr) is a laboratory scale search for the nature of dark matter. CASPEr searches for the axion and axion-like-particles (ALPs) as dark matter candidate in the mass range of a few feV to $\mu$eV [D. F. Jackson Kimball, et al., arXiv:1711.08999]. CASPEr uses experimental techniques based on Nuclear Magnetic Resonance (NMR) and precision magnetometry. In this talk, I will report on the experimental status of CASPEr.

Speaker: Deniz Aybas (Department of Physics, Boston University)

2019_07 APS DPF Northeastern.pdf

274 Enhancing the sensitivity of Axion Dark Matter search using Dynamic Nuclear Polarization

Cosmic Axion Spin Precession Experiment (CASPER) is a laboratory scale experiment looking for axion dark matter, using nuclear magnetic resonance (NMR) techniques. Dynamic nuclear polarization (DNP) can be used to improve experimental sensitivity. I will present first results from electron paramagnetic resonance experiments on transient light-induced paramagnetic centers in ferroelectric material PMN-PT, and outline the prospects for implementing DNP in our axion dark matter search.

Speaker: Janos Adam

2019-07-31 DNP APS Northeastern.pdf

2019-07-31 DNP APS Northeastern.pptx

275 Nanowire Detection of Photons from the Dark Side

In recent years, the development of fast and low-dark-count single-photon detectors for photonic quantum information applications promise a radical improvement in our capacity to search for dark matter. The advent of superconducting nanowire detectors, which have fewer than 10 dark counts per day and have demonstrated sensitivity from the mid-infrared to the ultraviolet wavelength band, provides an opportunity to search for bosonic dark matter in the neighborhood of 1 eV. These detectors are simple to fabricate and operate, and can be combined with gas cells, dielectric stacks, or combinations of these structures in cryogenic targets, optimized for dark matter absorption. Furthermore, superconducting nanowires can be used as both target and sensor for direct detection of sub-GeV dark matter [1].
In this work, we will combine resonator systems and quantum large-area single-photon detector, to establish a novel paradigm to look for dark matter with rest mass energies in the range of meV to 10 eV. Inherently resonant systems at these energies—narrow molecular absorption transitions [2] and periodically layered dielectric stacks [3] —bring with them a range of advantages: selectivity, control, and natural background reduction. We demonstrate high-performance 400 by 400 μm large-area tungsten-silicide nanowire prototype with 0.8-eV energy threshold with more than 90 thousand seconds of exposure, which showed no dark counts. The future experiment should enable probing new territory in the detection landscape, establishing the complementarity of this approach to other existing proposals.
[1] Y. Hochberg, I. Charaev, S.-W. Nam, V. Verma, M. Colangelo, K. K. Berggren, arXiv:1903.05101, 2019.
[2] A. Arvanitaki, S.Dimopoulos, and K. V. Tilburg, Phys. Rev. X8, 041001, 2018.
[3] M. Baryakhtar, J. Huang, and Robert Lasenby, Phys. Rev. D 98, 035006, 2018

Speaker: Ilya Charaev (Massachusetts Institute of Technology)

DPF_Charaev_2019.pdf

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University (US)), Ashutosh Kotwal (Duke University), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

276 Search for di-Higgs production in the $HH\to b\bar{b}\gamma\gamma$ decay channel with the ATLAS detector

We present a search for di-Higgs production in the $HH\to b\bar{b}\gamma\gamma$ decay channel. The measurement uses 139fb$^{−1}$ of $pp$ collisions recorded by the ATLAS experiment at a center-of-mass energy of 13 TeV. Selected events are separated into multiple regions, targeting both the SM signal and BSM signals with modified Higgs self-couplings. The latest results will be presented.

Speaker: Alex Zeng Wang (University of Wisconsin Madison (US))

DPF2019_AlexWang_20190731.pdf

277 Search for Di-Higgs Signals Decaying into 4 b-jets Produced in Association with Two Forward Jets in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

ATLAS has an extensive search program studying di-Higgs signatures. These searches are interesting for their potential to find not only new resonances decaying to pairs of Higgs bosons, but also for their sensitivity to otherwise difficult to measure couplings of the Higgs boson, such as the self-coupling. Using 127 fb$^{-1}$ of Run 2 $pp$ collisions at $\sqrt{s}=13$ TeV, the ATLAS experiment recently performed a new search for di-Higgs production in association with two forward jets, which is sensitive to the Vector Boson Fusion production mode. The analysis uses the decay channel with the largest branching ratio, the 4b mode, and triggers on b-jets. No excess over the SM expectation is found, and the world’s first limits on di-Higgs production in association with two forward jets are set; in addition, the first limits on the quartic coupling of two vector bosons and two Higgs bosons are set. Future directions include extensions to the other decay modes available and a broader interpretation of the data in the space of Higgs boson couplings.

Speaker: Maximilian J Swiatlowski (University of Chicago (US))

swiatlow_vbfhh_final_builds.pdf

swiatlow_vbfhh_final_nobuilds.pdf

278 Search for resonant production of HH decaying to the bbZZ final state at CMS

A search for the production of two Higgs bosons, where one Higgs boson decays into two b quarks and the other decays into two Z bosons is presented. The analysis is based on data collected by the CMS detector during the 2016 proton-proton running of the LHC. Upper limits at 95% confidence level are placed on the production cross section of a narrow-width spin-0 or spin-2 particle decaying to a pair of Higgs boson.

Speaker: Apichart Hortiangtham (Northeastern University (US))

hh_bbzz_dpf_2019_07_23_v3.pdf

279 Higgs boson mass measurement using H->ZZ->4l decays at CMS

The Higgs boson is an integral piece of the Standard Model and knowing its properties helps to establish limits on and to lower the uncertainties of other parameters in a wide variety of analyses. This presentation will summarize the methods used to make the world's most accurate Higgs mass measurement which currently stands at: $m_{H} = 125.26 \pm 0.21$ GeV. This analysis studies the $H \rightarrow ZZ \rightarrow 4\ell$ channel (where $\ell = e, \mu$) using 2016 data collected by the CMS experiment ($35.9\ fb^{-1}$) at $\sqrt{s} = 13$ TeV. A 3-dimensional likelihood fit is performed, which uses: (1) the four-lepton invariant mass, (2) event-by-event four-lepton mass uncertainty, and (3) a matrix element-based kinematic discriminant. In addition, a kinematic constraint on an invariant mass of two leptons coming from the mostly on-shell Z boson is used to improve measurements of their momenta and, hence, a measurement of the Higgs boson mass on an event-by-event basis.

Speaker: Jake Rosenzweig (University of Florida (US))

20190731_DPF_Presentation_Rosenzweig.pdf

280 Predictions for the Higgs boson mass measurement precision as a function of its transverse momentum up to 1 TeV for LHC and high luminosity LHC

The question of naturalness of the Standard Model has been a hot topic since the discovery of the Higgs boson with a relatively light mass. It has been pointed out in the past that the mass of a scalar boson can be destabilized by loop corrections.

Many Beyond the Standard Model theories have been proposed to address this problem. It is possible that such mechanisms contribute to the running of the Higgs mass with the energy scale.

We present predictions for the precision of the Higgs mass measurement up to a Higgs boson transverse momentum of 1 TeV for LHC Runs 2 and 3 with luminosity 150 fb$^{-1}$ and 300 fb$^{-1}$, and high luminosity LHC with luminosity of 3000 fb$^{-1}$. Predictions are generated with Madgraph5, Pythia8 and Delphes based on the CMS detector resolution.

Speaker: Anna Kropivnitskaya (The University of Kansas (US))

2019.07_HiggsMass_kropiv.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

281 The current status and future prospects of KamLAND-Zen

After running the first apparatus from 2011 to 2015, KamLAND-Zen was able to set a world leading lower limit on half-life of 136Xe neutrinoless double beta decay to 1.07×10^26 years with 90% C.L. The second apparatus completed an upgrade to double the amount of 136Xe, and the data taking has begun recently. This operation is expected to continue for 5 years, looking for bigger and cleaner data of double beta decay. In this talk, the status of this upgrade and recent analysis will be introduced, and future prospects for the experiment will also be presented.

Speaker: Mr Zhenghao Fu (MIT)

KamLAND_07:31:2019_v2.pdf

282 Suppression of Cosmic Muon Spallation Backgrounds in KamLAND-ZEN Using ConvolutionalNeural Network

Liquid scintillator-based detectors are one of the leading detector technologies in the search for neutrinoless double beta decay.KamLAND-ZEN, one of the leading experiment in this region, is currently limited by naturally occurring and spallation induced backgrounds. In the future they will be limited by the neutrino-electron scattering of boron-8 solar neutrinos.With the advancements in machine learning technology, we attempt to recognize neutrinos using a Spherical Convolutional Neural Network based model. We manage to reject backgrounds that are previously considered "impossible" in Monte Carlo data. With the advancement in this field, we are looking forward to adopt sophisticated algorithm, and tackle hard problems including directionality reconstruction.

Speaker: Mr Aobo Li (Boston University)

dpf_talk_v5.pdf

283 The search for neutrinoless double beta decay with EXO-200

EXO-200 is a neutrinoless double beta decay experiment using a low background time projection chamber filled with ~150 kg of liquid xenon enriched in $^{136}$Xe. The experiment, located at the Waste Isolation Pilot Plant near Carlsbad, New Mexico, recently completed data taking. After hardware upgrades, the last two years of data demonstrated improved energy resolution. Together with new software techniques for better background discrimination and larger statistics, the final analysis promises a half-life sensitivity beyond the current value of $3.7\times10^{25}$ yr at 90% CL. This talk will present the most recent results from the experiment.

Speaker: Andrea Pocar (University of Massachusetts, Amherst)

20190731_aps-dpf-exo200.pdf

284 The nEXO Double-Beta Decay Experiment

Large ultra-low background liquid xenon (LXe) detectors have recently emerged as a promising technology that can push the neutrinoless double beta decay search to unprecedented sensitivity. An observation of this decay would demonstrate lepton number violation and the Majorana nature of the neutrino. nEXO is a proposed experiment to use a 5 tonne liquid xenon time projection chamber (TPC) enriched with the isotope $^{136}$Xe for the neutrinoless double beta decay search. The nEXO detector design and science goals to reach sufficient sensitivity to entirely cover the inverted neutrino mass ordering region, i.e. $T_{1/2}\sim 10^{28}$ years, will be discussed.

Speaker: Brian Mong (SLAC)

2019 DPF The nEXO Double Beta Decay Experiment.pdf

285 The NEXT Neutrinoless Double Beta Decay Experiment

The NEXT (Neutrino Experiment with a Xenon TPC) experiment will search for neutrinoless double beta (0νββ) decay from 136-Xe using a high pressure xenon gas time projection chamber. This detector technology has several key advantages, including excellent energy resolution and powerful background rejection based on event topology. The collaboration is currently operating a 5 kg demonstrator called NEXT-White, which has been acquiring data at Canfranc Underground Laboratory (LSC) in Spain to demonstrate the detector capabilities and measure the 2νββ lifetime. A 2:1 scaled up successor called NEXT-100 is being developed with commissioning anticipated in 2020. NEXT-100 will search for 0νββ, as well as demonstrating performance and scalability of the high pressure xenon TPC technology for future searches. This talk will discuss the design of NEXT, as well as the current status, including resolution studies, topological discrimination from calibration data, and background validation. We will also present preliminary results on our 2νββ measurement.

Speaker: Mr Jonathan Haefner (Harvard University)

Jonathan Haefner NEXT DPF July 2019.pdf

286 Barium Tagging for the NEXT Neutrinoless Double Beta Decay Experiment

In the search for neutrinoless double beta decay, understanding and reducing backgrounds is crucial due to the extremely slow decay rate of the process. An advance that could drive backgrounds to negligible levels would be the ability to efficiently detect the barium daughter of 136-Xe to 136-Ba double beta decay, since no conventional radioactive process can produce barium ions or atoms in xenon. The approach under development by the NEXT collaboration involves transporting the barium ion from the active medium onto a glass plane coated with a barium sensitive fluorescent dye, monitored via fluorescence microscopy. Upon exposure to a barium ion, the dye will begin fluorescing, allowing for a coincident signal with the electron detection at the anode. Our results have shown that single barium ions can be observed using fluorescent dyes and Single Molecule Fluorescent Imaging (SMFI). The next challenge is to realize this technique in a large volume of xenon gas. Significant advances have recently been made, with custom barium-tagging molecules that fluoresce strongly in the dry state when exposed to barium now developed, and devices constructed that can observe fluorescence via in-vacuum or in-gas Total Internal Reflection Fluorescence Microscopy (TIRF-M). This talk presents the latest status of this technique and the outlook for barium tagging in NEXT.

Speaker: Mr Nicholas Byrnes (University of Texas Arlington)

Byrnes-DPF2019.pdf

287 The Search for Neutrinoless Double-Beta Decay at SNO+

SNO+ is a multipurpose experiment with the primary goal to search for neutrinoless double-beta (0νββ) decay of Te-130 to probe the Majorana nature of neutrinos. Currently, the detector is filled with ultra pure water and is in the process of filling liquid scintillator, to which 1.3 tons of Te-130 is expected to be loaded later this year. I will discuss the current preparations for the Te phase and the expected sensitivity, as well as the future prospect of the search for 0νββ decay at SNO+.

Speaker: Meng Luo (University of Pennsylvania)

DPF2019_v2.pdf

288 News from IUPAP Neutrino Panel

Speaker: Kate Scholberg (Duke University)

dpf19-iupap.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

289 Photosensor development for the IceCube upgrades

The IceCube Neutrino Observatory is a gigaton-scale Cherenkov detector in full operation at the South Pole since 2010. I will discuss new, more advanced photosensors designed for the IceCube Phase 1 Upgrade, scheduled for deployment in 2022/23. Further improvements are under development for the future IceCube Gen2 Observatory, including more radical new designs which will be field-tested in the Phase 1 Upgrade.

Speaker: Tyce DeYoung (Michigan State University)

DeYoung_Upgrade_DPF_2019.pdf

290 Detector R&D for ANNIE and Future Neutrino Experiments

The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is designed to serve as a test bed for new detector technologies in future water and liquid scintillator based neutrino experiments. Located on the Booster Neutrino Beam at Fermilab, ANNIE will be the first gadolinium-loaded water Cherenkov detector on a neutrino beam and will provide high statistics measurements of neutron yields from neutrino interactions in water. It is also the first particle-physics application of the new photosensor technology: Large Area Picosecond Photodetectors (LAPPDs). With single photon time resolutions of roughly 50 psec and mm-level imaging capabilities, LAPPDs bring considerable new capabilities for neutrino reconstruction in Cherenkov and scintillator detectors. Leveraging this technology to make detailed neutrino measurements, ANNIE will serve as a first demonstration of their impact on physics. In addition to LAPPDs, the ANNIE R&D program will likely explore other new technologies such as the addition of water-based liquid scintillator. The ANNIE Phase II detector is currently under construction and will start to take data in the summer of 2019. In this talk, I will present on the ANNIE detector R&D program and it's relevance to current and future neutrino experiments.

Speaker: Dr Emrah Tiras (Iowa State University)

ANNIE_APS_DPF_ETiras.pdf

291 Detector Physics with MicroBooNE

With many current and future neutrino experiments relying on Liquid
Argon Time Projection Chamber (LArTPC) technology, characterizing the
performance of these detectors is critical. The MicroBooNE experiment
is capable of performing numerous measurements to better understand
the technology. These include identification and filtering of excess
TPC noise, signal calibration, recombination, and measurements of
drift electron attenuation. MicroBooNE, residing on the surface, can
also provide important information about cosmic ray induced space
charge in the TPC volume and the resulting deformations to the
electric field. This talk will provide a detailed overview of the
subtleties of understanding LArTPC technology and developing
calibration techniques towards extracting physics measurements.

Speakers: Raquel Castillo (IFAE), Raquel Castillo Fernandez (FNAL)

DetectorPhysicsuB_DPF_Raquelv3.pdf

292 Low Noise Front-End Cold Electronics System R&D for SBND LAr TPC

The Short Baseline Near Detector (SBND) is one of three liquid argon (LAr) neutrino detectors sitting in the Booster Neutrino Beam (BNB) at Fermilab as part of the Short Baseline Neutrino (SBN) program. The detector is in a cryostat holding 260-ton of LAr and consists of four 2.5 m (L) × 4 m (W) Anode Plane Assembles (APAs) and two Cathode Plane Assemblies (CPAs), which leads to 11,264 Time Projection Chamber (TPC) readout channels and two separate 2 m long drift regions. As an enabling technology, Cold Electronics (CE) developed for cryogenic temperature operation makes possible an optimum balance among various design and performance requirements for such large sized detectors. There are two main advantages of CE. First, large detectors used for neutrino experiments require very low noise performance to meet their physics goals. CE decouples the electrode and cryostat design from the readout design. With the integration of electronics and detector electrodes, the capacitance of the input signal path is negligible, which results in the noise being independent of the fiducial volume. Meanwhile, the noise of the CMOS front end (FE) ASIC significantly decreases at cold temperature, benefiting from increased charge carrier mobility in silicon and decreased thermal fluctuations in accordance with kT/e. Second, signal digitization and multiplexing to high speed links inside the cryostat result in a large reduction in the quantity of cables (less outgassing) and number of feed-through penetrations, giving the designers of both the TPC and the cryostat the freedom to optimize the detector configurations.
Brookhaven National Laboratory (BNL) has been leading the R&D and implementation of the entire front-end CE system for LAr TPC readout in collaboration with other SBND institutes. The front-end readout electronics system will be presented. This includes the cold front-end electronics placed close to the wire electrodes, which detects and digitizes the charge signal in LAr, as well as the warm interface electronics placed on the signal feed-through flange outside of the cryostat, which further organizes and transmits the digitized signal to the DAQ system. An extensive study of electronics suitable for 77K – 300K, including the custom designed front-end ASIC and commercial components, e.g. ADC and FPGA, has been made to meet requirements such as low noise, low power consumption, high reliability and long lifetime. Furthermore, an integral design concept of APA, CE, feed-through, warm interface electronics with local diagnostics, grounding and isolation rules has been practiced with vertical slice test stands to project the CE performance in the SBND detector. A detailed QA/QC procedure has been developed and is currently being carried out for CE production, which is ongoing to support successful installation and commissioning of the SBND TPC readout electronics system in coming months.

Speaker: Dr Shanshan Gao (BNL)

SBND_CE_DPF2019_07312019_v1.pdf

293 Liquid Argon TPC Trigger Development with SBND

The Short Baseline Near Detector (SBND) is a 112 ton active mass liquid argon time projection chamber (LArTPC) that will begin operations in the Booster Neutrino Beamline at Fermilab in 2020. Its main physics goals include high-statistics measurements of neutrino-argon interaction cross-sections and searches for sterile neutrino oscillations as part of three LArTPCs that make up the Short Baseline Neutrino Program at Fermilab. In addition, SBND serves as an R&D platform for future LArTPC detectors such as the Deep Underground Neutrino Experiment (DUNE) far detector. One of the technical challenges of DUNE that SBND aims to address is that of efficient self-triggering of a LArTPC utilizing TPC signal information. This capability will enable searches for rare processes in the DUNE far detector, such as neutrino interactions from a potential galactic supernova burst. This talk will describe the SBND TPC readout system and ongoing R&D efforts to develop and demonstrate TPC-based triggering.

Speaker: Georgia Karagiorgi (Columbia University)

Liquid Argon TPC Trigger Development with SBND.pdf

294 The protoDUNE-SP LArTPC Electronics Production, Commissioning and Performance

The protoDUNE-SP detector is a large-scale prototype of the single-phase Liquid Argon Time Projection Chamber (LArTPC) design proposed for the Deep Underground Neutrino Experiment (DUNE). 15360 LArTPC wires are instrumented with low electronic noise pre-amplifier and digitization ASICs integrated into Front End Motherboards (FEMBs) operating at cryogenic temperature within the cryostat. The large number of electronics channels and high performance specifications required a large-scale production electronics quality control effort, careful installation into Anode Plane Assemblies (APAs) and rigorous detector commissioning. This successful collaboration-wide effort achieved a working LArTPC wire readout percentage of 99.73% (15318 out of 15360 channels), and 92.83% operating with electronic noise levels less than 800e- ENC. This talk will summarize the implementation of the protoDUNE-SP cold electronics quality control, installation and commissioning efforts that enabled excellent electronics performance. Lessons learned relevant to the upcoming DUNE LArTPC electronics production will also be highlighted.

Speaker: Brian Kirby (Brookhaven National Lab)

20190731_APSDPF_protoDUNESP_coldElecQC.pdf

QCD & Heavy Ions

parallel sessions

Conveners: Daniel Tapia Takaki (University of Kansas), Olga Evdokimov (University of Illinois at Chicago (US)), Radja Boughezal (Argonne National Laboratory), Salvatore Rappoccio (The State University of New York SUNY (US))

295 Ultra-peripheral heavy-ion collisions + forward/diffraction at RHIC

In recent years the STAR Collaboration collected a large sample
of ultra-peripheral heavy-ion collisions. The photoproduction of
J/Psi vector mesons is sensitive to the gluon content of the target
nucleon or nucleus. We will present results from a statistically
large sample of J/Psi production in Au+Au collisions. A significant
result comes from the study of the pT distributions, which clearly
show two components, from scattering off the entire Au nucleus or off
individual nucleons inside the nucleus. From a smaller sample of J/Psi
production in p+Au collisions, with polarized protons, we will discuss
the status of a first study of the asymmetry of J/Psi production.
A non-zero asymmetry would be the first measure of the generalized
parton distribution, E, for gluons, which is connected with the
orbital angular momentum of partons in the nucleon. The present study
is a proof-of-principle, and we will discuss the possibilities with
larger data samples from future polarized p+p and p+Au RHIC runs.

In recent years, STAR has also accumulated data in polarized p+p
collisions with a Roman Pot system which measures forward-scattered
protons. We will present results on elastic p+p scattering,
including the elastic and total cross sections and the |t|
distribution. Results from low mass particle/antiparticle pairs
from central exclusive production will also be discussed, along
with charged particle spectra in single diffractive dissociation.

Speaker: William Schmidke (BNL)

STAR_UPC.pdf

296 Quenching of Hadron Spectra in Heavy Ion Collisions at the LHC

The $p_\perp$ dependence of the nuclear modification factor $R_{\rm AA}$ measured in XeXe and PbPb collisions at the LHC exhibits a universal shape, which can be very well reproduced in a simple energy loss model based on the BDMPS medium-induced gluon spectrum. The scaling is observed for various hadron species ($h^\pm$, $D$, $J/\psi$) in different centrality classes and at all colliding energies, $\sqrt{s}=2.76, 5.02, 5.44$ TeV. When comparing different systems, it is found that the average energy loss properly scaled by the particle multiplicity and the transverse area of quark-gluon plasma has a simple dependence on the path length traversed by the fragmenting partons. Based on this model, a data-driven procedure is suggested, which allows for the determination of the first and second moments of the quenching weight without any prior knowledge of the latter.

Speaker: Francois Arleo (Laboratoire Leprince-Ringuet)

arleo_DPF_2019.pdf

297 General Balance Functions of $\pi^{\pm}$, $K^{\pm}$ and $p/\bar{p}$ in Pb--Pb Collisions at the LHC

In relativistic heavy-ion collisions, correlations of particles with opposite quantum numbers provide insight into general charge creation mechanisms, the time scales of quark production, collective motion of the Quark Gluon Plasma (QGP), and re-scattering in the hadronic phase. The longitudinal and azimuthal widths of general charge balance functions for charged pion ($\pi^{\pm}$), kaon ($K^{\pm}$) and (anti-)proton ($p/\bar{p}$) are used to examine the two-wave quark production scenario recently proposed to explain quark-antiquark productions within the QGP, which predicts a large increase in up and down quark pairs relative to strange quark pairs around the time of hadronization. In addition, the magnitudes of balance functions for different species pairs provide quantitative differential information on pair production channels, which probes the fragmentation mechanism of strings into different quark flavors.

The first measurement of balance functions of the full species matrix of $\pi^{\pm}$, $K^{\pm}$ and $p/\bar{p}$ in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV at the LHC is presented, which provides critical information about the QGP hadronization chemistry in two dimensions of relative rapidity ($\Delta y$) and relative azimuthal angle ($\Delta\varphi$). The balance function results provide key constraints on particle productions in theoretical models. The first balancing charge yield results show the balancing pair production probabilities, which indicate the QGP hadronization chemistry may have little centrality dependence. The widths of balance function projections onto $\Delta y$ and $\Delta\varphi$ of different species pairs show different trends as a function of collision centrality, which are qualitatively consistent with the two-wave quark production scenario and the radial flow effect.

Speaker: Jinjin Pan (Wayne State University)

AuAu_20190731_DPF_GBF_v1.pdf

298 Heavy Ion quarkonia and heavy flavor CMS + ATLAS results

Measurements of heavy flavor hadrons and quarkonia in heavy ion collisions provide information about the in-medium color interaction inside the quark-gluon plasma (QGP), the high-density QCD medium created in heavy-ion collisions. Quarkonia, which are pairs of a heavy quark and an anti-quark, could be used to study the modification of color potential between the pairs. Heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. As the main observables to study the medium effect, nuclear modification factors (RAA) of heavy-flavor particles provide insights into the flavor dependence of in-medium parton energy loss. In addition, azimuthal anisotropy coefficients (vn) of heavy-flavor particles provide information about the degree of the thermalization of the bulk medium. Over the past few years, using the large statistics proton-proton and Pb-Pb samples collected at 5.02TeV during the 2015 LHC run, high precision measurements of charm and beauty mesons have been performed with the CMS and the ATLAS detector over a wide transverse momentum range. In this talk, recent results from the CMS and ATLAS experiments on quarkonia and heavy flavor studies in heavy ion collisions are summarized and the implications on future measurements are discussed.

Speaker: Gwang-Jun Kim (Massachusetts Inst. of Technology (US))

DPF2019_v4_GwangJunKim.pdf

299 Heavy ion quarkonia and heavy flavour results from ALICE and LHCb

A rich set of quarkonia and heavy flavour result is observed by LHCb ALICE in pPb and pPbPb collisions collected at 5 and 8.16 TeV nucleon-nucleon centre-of-mass energies. In case of PbPb collisions heavy hadrons constitute unique probes for the hot and dense QCD medium produced in heavy-ion collisions: the Quark-Gluon Plasma. This talk presents production measurements of beauty hadrons and open charm states including baryons, through cleanly reconstructed exclusive decays. Results on nuclear effects, quantified by the nuclear modification factors, forward-to-backward production ratios and baryon-to-meson ratios, will be discussed.

The ALICE detector is well suited to measure the production of leptons from heavy- flavour hadrons decays at mid- and forward rapidities while the LHCb detector has a unique particle identification system and excellent momentum and vertex reconstruction in the forward region which makes the results from the two detectors complementary.

Speaker: Gerd Joachim Kunde (Los Alamos National Laboratory (US))

KUNDE_DPF2019.pdf

Quark & Lepton Flavor

parallel sessions

Conveners: Bertrand Echenard (California Institute of Technology (US)), Brian Beckford (University of Michigan), J Michael Williams (Massachusetts Inst. of Technology (US)), Wolfgang Altmannshofer (UC Santa Cruz)

300 Observation of Pentaquarks at LHCb

The recent discovery of several narrow pentaquark states by the LHCb experiment will be presented.

Speaker: Dan Craik (MIT)

20190731_dcraik_dpf.pdf

301 Perturbative Corrections to Heavy Quark-Diquark Symmetry Predictions for Doubly Heavy Baryon Hyperfine Splittings

Doubly heavy baryons $\left(QQq\right)$ and singly heavy antimesons $\left(\bar{Q}q\right)$ are related by the heavy quark-diquark (HQDQ) symmetry because in the $m_Q \to \infty$ limit, the light degrees of freedom in both the hadrons are expected to be in identical configurations. Hyperfine splittings of the ground states in both systems are nonvanishing at $O(1/m_Q)$ in the heavy quark mass expansion and HQDQ symmetry relates the hyperfine splittings in the two sectors. In this paper, working within the framework of Non-Relativistic QCD (NRQCD), we point out the existence of an operator that couples four heavy quark fields to the chromomagnetic field with a coefficient that is enhanced by a factor from Coulomb exchange. This operator gives a correction to doubly heavy baryon hyperfine splittings that scales as $1/m_Q^2 \times \alpha_S/r$, where $r$ is the separation between the heavy quarks in the diquark. This correction can be calculated analytically in the extreme heavy quark limit in which the potential between the quarks in the diquark is Coulombic. In this limit, the correction is $O(\alpha_s^2/m_Q)$ and comes with a small coefficient. For values of $\alpha_s$ relevant to doubly charm and doubly bottom systems, the correction to the hyperfine splittings in doubly heavy baryons is only a few percent or smaller. We also argue that nonperturbative corrections to the prediction for the hyperfine splittings are suppressed by $\Lambda^2_{\rm QCD}/m_Q^2$ rather than $\Lambda_{\rm QCD}/m_Q$. Corrections should be $\approx 10\%$ in the charm sector and smaller in heavier systems.

Speaker: Abhishek Mohapatra (Duke University)

DPF_Abhishek_2019.pdf

DPF_Abhishek_2019.pptx

302 Some interesting aspects of /\b baryon decays

The decays of the /\b baryon constitute important sources of information for different aspects of weak interactions. /\b baryons are produced prolifically at the LHC, with their production ratio with respect to light B mesons decreasing rapidly with transverse momentum. These /\b's have been analyzed by the LHCb collaboration in order to measure form-factors in /\b->/\c mu- nu transitions, seeing evidence for pentaquark states, and other aspects of weak interactions that will be reported.

Speaker: Mr Aravindhan Venkateswaran (Syracuse University (US))

Lambda_b_DPF.pdf

303 Revisiting XEFT for the study of X(3872)

We revisit the non-relativistic effective field theory called XEFT that is specifically designed for the description of X(3872) which is one of the most interesting candidates for hadronic molecules. In the framework XEFT, X(3872) is described as a bound state of two D mesons. Two new interaction terms consistent with general power counting rules are introduced to study the interaction of these D mesons. We investigate the effects of these new terms by explicitly calculating the decay rate of X(3872) up to next to leading order.

Speaker: Dr Lin Dai (Duke University)

Lin-Dai-DPF19.pdf

304 Study of $Z_c(3900)$ production in $p\bar p $ collisions

We selected candidate events for production of the exotic charged charmonium-like states $Z_c^{\pm}(3900)$ decaying to $ J/\psi\pi^{\pm}$ and $X(3872)$ decaying to $J/\psi\pi^{\pm}\pi^{\mp}$. We use 10.4 $\rm fb^{−1}$ of $p\bar p$ collisions recorded by the D0 experiment at the Tevatron collider at $\sqrt s=$1.96 TeV. We measure the $Z_c$ mass and natural width using subsample of candidates originating from semi-inclusive weak decays of b-flavored hadrons and search for the $Z_c$ prompt production. We also study various properties of the $X(3872)$ production that are compared to $\psi(2S)\to J/\psi\pi^{\pm}\pi^{\mp}$ production.

Speaker: Phillip Gutierrez (University of Oklahoma (US))

DPF-2019_PG.pdf

NSF: Meeting with Early Career Scientists (Students, Postdocs, Junior Faculty)

Convener: Randy Ruchti (University of Notre Dame (US))

Social Program: Public Lecture

During the Tuesday Banquet at the MFA, we will recognize the 2018 APS Fellowship recipients.

305 The Dark Matter at the Heart of Physics

Dark matter is one of the most mysterious and essential components of the Universe. It enabled the formation of our own Galaxy and everything we see in the night sky, and yet, it appears to be completely invisible. I'll talk about how astronomy told us dark matter exists, how particle physics might answer the question of its true nature, and why discovering it might reshape our picture of the fundamental physics of the cosmos.

Speaker: Katherine Mack (North Carolina State University)

Thursday, 1 August

Plenary Sessions: Thursday Morning 1

Convener: Young-Kee Kim (University of Chicago (US))

306 Precision Higgs, Electroweak, and Top Physics

Speaker: Michael Peskin

FutureofPrecisionHiggsandEW.pdf

307 Precision Cosmology

Speaker: Chihway Chang (University of Chicago)

Precision Cosmology

308 Precision Neutrinos

Speaker: Elizabeth Turner Worcester (Brookhaven National Laboratory (US))

neutrinoprecision_etw_dpf2019.pdf

309 DOE

Speaker: Glen Crawford (United States Department of Energy)

2019-08-01 DOE HEP Program Status at PI Meeting (DPF).pdf

310 NSF

Speaker: Randy Ruchti (University of Notre Dame (US))

NSF PHY DPF2019.pdf

10:30 Coffee Break

Plenary Sessions: Thursday Morning 2

Convener: Dmitri Denisov (Brookhaven National Laboratiry)

311 Regional Programs in HEP: Asia

Speaker: Xinchou Lou (Chinese Academy of Sciences (CN))

DPF2019-XCLOU-08012019-updated.pdf

312 European Strategy Study

Speaker: Halina Abramowicz (Tel Aviv University (IL))

DPF-Boston.pdf

313 Gearing up for Snowmass 2021

Speakers: Prisca Cushman (University of Minnesota (US)), Prisca Cushman (University of Minnesota), Young-Kee Kim (University of Chicago (US))

DPFSnowmass_5.pdf

314 DPF2019 Thurs Remarks

Speakers: Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

Day4_remarks.pdf

Lunch Time Sessions: Snowmass Planning DPF Town Hall

Conveners: Prisca Cushman (University of Minnesota (US)), Prisca Cushman (University of Minnesota), Young-Kee Kim (University of Chicago (US))

315 DPF Town Hall on Snowmass Planning (Lunchtime Discussion)

Speakers: Prisca Cushman (University of Minnesota (US)), Prisca Cushman (University of Minnesota), Young-Kee Kim (University of Chicago (US))

DPF TownHall.pdf

316 Discussion

Accelerators

Parallel Sessions

Conveners: Patric Muggli (Max Planck Institute for Physics), Silvia Verdú Andrés (Brookhaven National Laboratory BNL), Vladimir Shiltsev (Fermilab)

317 US CONTRIBUTION TO THE HIGH LUMINOSITY LHC UPGRADE: FOCUSING QUADRUPOLES AND CRAB CAVITIES

In the early 2000's, the US High Energy Physics community contributing to the Large Hadron Collider (LHC) launched the LHC Accelerator R&D Program (LARP), a long-vision focused R&D program, intended contribute to a quick LHC commissioning and to bring the Nb3Sn and other technologies to a maturity level that would allow applications in HEP machines. Around 2015, the technologies developed by LARP, CERN and other institutions were mature enough to allow the spin-off of a major upgrade project to the LHC complex, the High Luminosity LHC (HL-LHC). The talk will focus on the US contribution to HL-LHC, namely the large-aperture low-β focusing Nb3Sn quadrupoles and the Radio Frequency Dipole (RFD) Crab Cavities, located in close proximity to the ATLAS and CMS experiments.
This contribution, called the HL-LHC Accelerator Upgrade Project (HL-LHC AUP), focuses on production of these quadrupoles and cavities by sharing the work among a consortium of US Laboratories (FNAL, LBNL, BNL and SLAC) and Universities and in close connection with the CERN-led HL-LHC Collaboration. The collaboration achieved commonality of specifications and uniformity of performance. Final development of design, construction and first results from the prototypes are described to indicate the status of these critical components for HL-LHC.

Speaker: Sandor Feher (Fermi National Accelerator Lab. (US))

APS-DPF-AUP-talk.pdf

APS-DPF-AUP-talk.pptx

318 Electron-Ion Collider eRHIC:Design and R&D status

The Electron-Ion Collider will open exciting new frontiers for research in nuclear physics and quantum chromodynamics. eRHIC, a proposed realization of the Electron-Ion collider in BNL, is based on the existing and highly optimized RHIC ion-ion collider. The design of eRHIC has been developed in a joint effort by nuclear physicists and accelerator scientists, enabling large acceptance experiments with unprecedented resolving power in the domain of quarks and gluons. It is planned to add an electron storage ring to the RHIC complex in order to enable electron-proton and electron-ion collisions in wide range of center-of-mass energies (29-140 GeV) with the luminosity exceeding 10^34 cm^-2s^-1. For collisions of electrons with protons and light ions, both beams will be spin polarized with polarization of 70%. Accelerator R&D continues to address technological challenges which include crab-crossing, strong hadron cooling, aspects of SRF technology (HOM dampers, tunable coupler), superconducting interaction region magnets, in-situ beam pipe coating and others. The talk presents status of the eRHIC accelerator design and describes recent progress done on the accelerator R&D.

Speaker: Dr Vadim Ptitsyn (Brookhaven National Laboratory)

eRHIC_VP_DPF_2019_1.pptx

eRHIC_VP_DPF_2019_2.pptx

319 JLEIC: A High Luminosity Polarized Electron-Ion Collider at Jefferson Lab

A recent assessment by US National Academies of Science concluded that the science questions that could be answered by a US-based electron-ion collider are significant to advancing our understanding of the atomic nuclei that make up all visible matter in the universe. JLEIC, a polarized electron-ion collider, was proposed and studied at Jefferson Lab for this QCD frontier, utilizing the existing CEBAF SRF electron linac. The JLEIC machine design promises to deliver unrivaled performance in luminosity and polarization, and outstanding capabilities in detection, preeminent in nuclear physics for decades to come. In this talk we present a brief summary of the JLEIC design, and also highlight its accelerator R&D program.

Speaker: Dr Yuhong Zhang (Thomas Jefferson National Accelerator Facility)

JLEIC_DPF2019_Zhang.pdf

JLEIC_DPF2019_Zhang.pptx

320 Strong Hadron Cooling for the Electron Ion Collider

The anticipated peak and average luminosity of L = $10^{34}$ cm$^{-2}$ s$^{-1}$ of the Electron Ion Collider can be achieved with strong cooling of the hadron beam, as the emittance of the very bright beams is subject to rapid growth due to Intrabeam Scattering. The techniques which are envisioned to be applied and to stabilize the beam emittance range from bunched beam stochastic cooling, bunched beam electron cooling to coherent electron cooling which is the extension of stochastic cooling to much larger bandwidth. There are also alternatives such as frequent replacement of the hadron beams enabled by an on-energy hadron injector which provide the required luminosity without strong hadron cooling. The techniques are described and discussed and the achievable peak and average luminosity for the full range of center of mass energies is discussed.

Speaker: Dr Ferdinand Willeke (Brookhaven National Laboratory)

Strong-Hadron_cooling-vs01.pdf

Strong-Hadron_cooling-vs01.pptx

Astroparticles & CMB

Conveners: Kerstin Perez (MIT), Laura Newburgh, Lindsey Bleem (Argonne National Laboratory)

321 Inverse Compton emission from millisecond pulsars in the Galactic bulge

Millisecond pulsars (MSPs) are old, rapidly rotating neutron stars that have been detected in multiple wavelengths, including gamma rays. A population of faint MSPs in the Galactic bulge could potentially explain the mysterious GeV excess found in the Fermi Large Area Telescope data. If MSPs are responsible for the excess, their leptonic injections ($e^\pm$) could produce detectable inverse-Compton (IC) emissions by up-scattering ambient photons to gamma-ray energies. This provides a useful handle to distinguish MSP from other origin scenarios of the GeV excess, such as dark matter. For the first time, we calculated such IC emissions with a triaxial 3D model of the bulge stars as the tracer of the putative MSP population. We show that the IC emissions above TeV leave unique signatures in their skymaps. They could be detected by future high-energy gamma-ray detectors such as the Cherenkov Telescope Array and provide a viable multiwavelength handle for the MSP origin of the GeV excess.

Speaker: Deheng Song (Virginia Tech)

dpf2019boston.pdf

322 Towards Understanding the Origin of Cosmic-Ray Positrons and Electrons

Precision measurements of cosmic ray positrons and electrons are presented based on 1.9 million positrons and 28.1 million electrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence with a sharp drop-off above 284 GeV. In the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons with an exponential energy cutoff, which dominates at high energies. This shows that, at high energies, positrons predominantly originate either from dark matter annihilation or from other astrophysical sources. Contrary to the positron flux the electron flux does not have an energy cutoff. The different behavior of the cosmic-ray electrons and positrons measured by AMS is clear evidence that most high energy electrons originate from different sources than high energy positrons.

Speaker: Zhili Weng (Massachusetts Inst. of Technology (US))

ZhiliWeng_DPF_2019_positron_electron_20190801.pdf

323 Antiproton Flux and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the ISS

The fluxes and flux ratios of charged elementary particles in cosmic rays are presented in the absolute rigidity range from 1 up to 2000 GV. In the absolute rigidity range ∼60 to ∼500 GV, the antiproton, proton, and positron fluxes are found to have nearly identical rigidity dependence and the electron flux exhibits different rigidity dependence. Below 60 GV, the antiproton-to-proton, antiproton-to-positron, and proton-to-positron flux ratios each reaches a maximum. Particular emphasis is made on new observations of the properties of elementary particles in the rigidity range above 500 GV.

Speaker: Zhili Weng (Massachusetts Inst. of Technology (US))

324 Properties of cosmic-ray primary nuclei by AMS con ISS

Properties of cosmic-ray primary nuclei from Z=1 to Z=16 measured by Alpha M magnetic spectrometer on ISS will be presented

Speaker: Qi Yan (Massachusetts Inst. of Technology (US))

qy_mit_ae_2019APSPrimary.pdf

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Stefania Gori (UC Santa Cruz), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US))

325 Search for electroweak gauginos in the compressed mass spectra with the ATLAS detector

Among many minimal and phenomenologically motivated Supersymmetry (SUSY) scenarios, the "compressed mass spectra scenario" is the one of the most appealing. This is favored by the observed dark matter relic abundance and the naturalness argument and so on, where the electroweak gaugino (EWKino) states typically have O(1) GeV - 100 GeV mass splitting between them. While these EWKino states can be directly probed in collider experiments, due to the challengingly indistinctive signature and the small production cross-section, they are poorly constrained compared to other SUSY particles. For instance, 100-300GeV EWKinos are still fairly viable.
This talk describes a dedicated compressed spectra search program in the ATLAS experiment, development of a new analysis technique, and the recent results using the full Run 2 dataset from $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector.

Speaker: Shion Chen (University of Pennsylvania (US))

compressedSUSYEWK_schen_DPF2019.pdf

326 Search for chargino-neutralino production using an emulated recursive jigsaw reconstruction technique in three-lepton final states with the ATLAS detector

A search for supersymmetry through the pair production of electroweakinos is presented in a three-lepton final state. The analyzed proton-proton collision data taken at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV was collected between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 139 $\mbox{fb\(^{-1}\)}$. The search emulates the recursive jigsaw reconstruction technique using conventional analysis variables, searching for low-mass chargino-neutralino pair production that decays to on-shell $W$ and $Z$ bosons. The technique is validated and the excess seen previously in 2015 and 2016 data is studied while incorporating new data.

Speaker: Elodie Deborah Resseguie (University of Pennsylvania (US))

dpf2019_resseguie.pdf

327 Combined collider constraints on neutralinos and charginos with GAMBIT

Due to their small production cross sections, electroweakinos are difficult to directly search for at colliders. However, the LHC has reached sufficiently high integrated luminosity that the existence of electroweakinos at masses of hundreds of GeV can now be probed. In this talk I will present the results of a likelihood analysis of the electroweakino sector using the GAMBIT global fitting tool. Taking into account an array of 8 and 13 TeV ATLAS and CMS results, we have studied the viability of a portion of the MSSM parameter space where neutralinos and charginos are the only light sparticles. I will show that in this framework it is difficult to robustly exclude any range of neutralino or chargino masses, and furthermore there are consistent excesses in multiple LHC analyses which could be hinting at the existence of new physics.

Speaker: Dr Jonathan Cornell (University of Cincinnati)

Cornell_GAMBIT_EWino_APS_DPF_2019 .pdf

328 Search for supersymmetry in events with tau leptons with the CMS experiment

We present the results of searches for supersymmetry in final states with tau leptons using data collected by the CMS experiment corresponding to integrated luminosities of up to 137 /fb. A variety of supersymmetric scenarios in which tau sleptons may be produced are considered, targeting scenarios in which tau sleptons could be amongst the lightest supersymmetric particles. These searches are particularly intriguing in the light of tau slepton-neutralino coannihilation models that could explain the observed dark matter relic density. Deep learning is used in some cases to enhance the performance of algorithms used to identify hadronic tau decays.

Speaker: Valentina Dutta (Univ. of California Santa Barbara (US))

cms_susy_taus_dpf19_vdutta.pdf

329 Search for chargino pair-production and chargino-neutralino production with $R$-Parity Violating decays in pp collisions at $\sqrt{s}$ = 13 TeV with ATLAS

A search is presented for chargino pair-production and chargino-neutralino production, where the almost mass-degenerate chargino and neutralino each decay via $R$-Parity-violating couplings to a boson ($W/Z/H$) and a charged lepton or neutrino. This analysis searches for a trilepton invariant mass resonance in data corresponding to an integrated luminosity of 139 fb$^{-1}$ recorded in proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector at the Large Hadron Collider at CERN.

Speaker: Mr Lucas Macrorie Flores (University of Pennsylvania (US))

DPFtalk_final.pdf

Computing, Analysis Tools, & Data Handling

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Peter Onyisi (University of Texas at Austin (US))

330 Tools for Trigger Rate Monitoring at CMS

Designed to push forward our understanding of fundamental physics at the energy frontier, the Compact Muon Solenoid (CMS) detector is one of the two general-purpose particle detectors at the LHC. Collisions take place within CMS at approximately 40 MHz, producing much more data than can be recorded or stored for future analysis. However, only a small fraction of the collisions contain events likely to be associated with new or interesting phenomena. In order to select as many of these potentially interesting events as possible while reducing the rate to a more manageable 1 kHz, CMS employs a two-tiered trigger system consisting of a hardware based Level-1 (L1) Trigger and a software based High Level Trigger (HLT). Monitoring the output rates of the trigger paths is of key importance to determining the overall performance of the trigger system; these rates are also very sensitive to the performance of all aspects of the detector, so rate monitoring can often provide the first indication of issues that arise within the various sub-detectors of CMS as well. This presentation will discuss the CMS trigger system and describe the software tools developed and used by CMS to characterize, monitor, and visualize the L1 and HLT trigger rates.

Speaker: Kelci Mohrman (University of Notre Dame (US))

RateMon_DPFSlides.pdf

331 The migration of the ATLAS electron photon trigger software to the AthenaMT

As we are moving towards LHC Run 3, the data acquisition in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector will be performed in a multi-threaded environment of the Athena framework (AthenaMT). This will allow the concurrent processing of High Level Trigger (HLT) algorithms on single and multiple events. For trigger electron/photon reconstruction, the Run 2 legacy system had two main stages: “Fast” (reconstruction + rejection) and “Precision” (reconstruction + rejection). The Fast step used trigger-specific algorithms and was followed by the Precision step. The reconstruction in the Run 2 Precision step used “offline”-like methods keeping them trigger compatible. However, full implementation of the offline algorithm would lead to a more efficient reconstruction of the final objects (e.g. electrons and photons) at the HLT. The previous incompatibility of offline algorithms in the trigger environment has been addressed in the AthenaMT. A common data-algorithm interface has been introduced for both the trigger and the offline environments. The optimization of CPU usage is being done by allowing data dependency and simultaneous running of different algorithms. This talk will present the efforts being made to use electron/photon offline reconstruction algorithms intact in the trigger environment at the AthenaMT with results, future plans and issues came along with it.

Speaker: Mr Debottam Bakshi Gupta (University of Texas at Arlington (US))

DPF2019_vCorr5.pdf

332 Application of Quantum Machine Learning to High Energy Physics Analysis at LHC using IBM Quantum Computer Simulators and IBM Quantum Computer Hardware

Using IBM Quantum Computer Simulators and Quantum Computer Hardware, we have successfully employed the Quantum Support Vector Machine Method (QSVM) for a ttH (H to two photons), Higgs coupling to top quarks analysis at LHC.

We will present our experiences and results of a study on LHC high energy physics data analysis with IBM Quantum Computer Simulators and IBM Quantum Computer Hardware using IBM Qiskit. The work is in the context of a Qubit platform. Taking into account the limitation of a low number of qubits, the result expressed in ROC curve is comparable with the results using a classical machine learning method. This study is applied to a physics channel where Higgs-coupling-to–two-top-quarks (ttH), one of the flagship physics channels at LHC. Here ROC curve is defined as the Receiver Operating Characteristics curve on the plane of background rejection versus signal efficiency. At our current stage, with 5 qubits and 800 events we have reached AUC of 0.86, which is similar to the AUC of 0.87 from classical machine learning method (BDT), where AUC is the area under the ROC curve. By the time of the conference, we expect to have results performed by 20 qubits.

In addition, collaborating with IBM Research Zurich, we finished training with machine learning on the IBM Quantum Computer Hardware with 100 training events, 100 test events, and 5 qubits, again for ttH (H to two photons) analysis at LHC. Because of hardware access time and timeout limitations, we only finished a few iterations. By the time of the conference, we expect to perform the study on 20 qubits hardware with large number of iterations.

The work is performed with an international and interdisciplinary collaboration with high energy physicists (Physics Department, University of Wisconsin), computational scientists (Computing Science Department, University of Wisconsin and CERN openlab, IT Department), and quantum computing scientists (IBM Research Zurich).

This work pioneers a close collaboration of academic institutions with industrial corporations in High Energy Physics analysis effort.

Speaker: Alex Zeng Wang (University of Wisconsin Madison (US))

DPFQML_AlexWang_20190801.pdf

333 Noise Filtering and Signal Processing in the ProtoDUNE-SP LArTPC

ProtoDUNE-SP, the prototype of the single-phase DUNE far detector, was constructed and operated at the CERN Neutrino Platform with total liquid argon (LAr) mass of 0.77 kt and using full-scale components of the design for DUNE. The physics program of protoDUNE-SP aims to understand and control the systematic uncertainties for future oscillation measurements at DUNE, the charged-particle beam test allows to measure the detector calorimetric response for hadronic and electromagnetic showers, to study secondary particle production and argon-hadron cross sections, to evaluate and improve particle identification mechanisms and validate Monte Carlo simulations. In a liquid argon time-projection chamber(LArTPC) ionization electrons from a charged-particle track drift towards the wire planes, the induced current in the wire is read out and digitized by low-noise electronics. In this talk, we present the noise filtering and the signal processing techniques in protoDUNE-SP by which the digitized raw waveform is processed to recover the original ionization signal in charge and time.

Speaker: Carlos Sarasty Segura (University of Cincinnati)

Signal processing in the protoDUNE-SP LArTPC.pdf

DOE: Intensity Frontier

Convener: Michael Cooke (U.S. Department of Energy)

334 DOE Intensity Frontier Overview

Speaker: Michael Cooke (U.S. Department of Energy)

2019-08-01 HEP PI Meeting - Intensity Frontier.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

335 Unification of the Standard Model and Self-Interacting Dark Matter in [SU(5)*U(1)]^4 GUT

A spontaneously broken hidden U(1)$_h$ gauge symmetry can explain both the dark matter stability and the observed relic abundance. In this framework, the light gauge boson can mediate the strong dark matter self-interaction, which addresses astrophysical observations that are hard to explain in collisionless cold dark matter. Motivated by flavoured grand unified theories, we introduce right-handed neutrinos and a flavoured B-L gauge symmetry for the third family U(1)$_{B-L}$. The unwanted relic of the U(1)$_h$ gauge boson decays into neutrinos via the kinetic mixing with the U(1)$_{(B - L)_3}$ gauge boson. This model can also explain the lepton flavour universality violation in semi-leptonic B meson decays that is recently found in the LHCb experiment. We found that the dark sector is naturally obtained when there is a strong SU(5) gauge interaction, U(1) gauge interaction, and fermions with appropriate representations at a UV scale. This implies that the whole sector can be unified into a [SU(5)*U(1)]$^4$ gauge theory. The first three sets of gauge groups are spontaneously broken to the SM gauge groups while the last one becomes strong at an intermediate scale and gives a self-interacting dark matter at a low energy scale.

Speaker: Dr Masaki Yamada (Tufts University)

MYamada.pdf

336 Direct Detection Signals from Absorption of Fermionic Dark Matter

We present a new class of direct detection signals; absorption of fermionic dark matter. We enumerate the operators through dimension six which lead to fermionic absorption, study their direct detection prospects, and summarize additional constraints on their suppression scale. Such dark matter is inherently unstable as there is no symmetry which prevents dark matter decays. Nevertheless, we show that fermionic dark matter absorption can be observed in direct detection and neutrino experiments while ensuring consistency with the observed dark matter abundance and required lifetime. For dark matter masses well below the GeV scale, dedicated searches for these signals at current and future experiments can probe orders of magnitude of unexplored parameter space.

Speaker: Robert McGehee (University of California, Berkeley)

RMcGehee_Fermionic_Absorption.pdf

337 A sub-GeV dark matter model

An extension of the Standard Model gauge symmetry by the gauge group $U(1)_{T3R}$ is proposed in order to understand the Yukawa coupling hierarchy in the SM. Only the right-handed fermions of the first two generations are charged under the $U(1)_{T3R}$. In addition to the new dark gauge boson, a dark scalar particle acquires a vacuum expectation value (vev) which breaks the $U(1)_{T3R}$ symmetry down to $Z_2$ symmetry and also explains the hierarchy problem. A vev of $\cal O$(GeV) is required to explain the mass parameters of the light flavor sector naturally. The dark matter (DM) particle naturally has mass in the ${\cal O}(1-100)$ MeV range. We discuss the various prospects of the direct detection of the dark matter. The dark matter satisfies the correct thermal relic abundance.

Speaker: Prof. Bhaskar Dutta

sub_GeV_DPF_new.pdf

338 Direct detection limits on sub-GeV Dark Matter from the DAMIC@Snolab experiment

We present direct detection constraints on sub-GeV dark matter interacting with electrons using the DAMIC@Snolab experiment – which utilizes high resistivity, scientific grade CCDs to image ionization deposits produced by particle interactions within the devices. Using a relatively novel methodology of placing constraints based on leakage current, we report preliminary limits probing new parameter space for dark matter-electron scattering for masses roughly between 0.6 MeV $c^{-2}$ to 5 MeV $c^{-2}$, along with limits on the flux of Lightly Ionizing Particles from fractional charge e$^-$/30 to e$^-$/10000 using a similar analysis.

Speaker: Karthik Ramanathan (University of Chicago)

Ramanathan_APS_DPF_2019

Diversity & Inclusion

parallel sessions

Conveners: Brian Beckford (University of Michigan), Corrinne Mills (University of Illinois at Chicago (US))

339 The Early Career, Gender & Diversity Office at the LHCb experiment

The mandate of the Early Career, Gender & Diversity (ECGD) office is to
oversee the well being and working environment of all LHCb members. The
ECGD office was created by the LHCb management in 2014. Since March
2019, the role of the ECGD office is defined in the LHCb constitution.
One ECGD officer is invited to attend the LHCb Collaboration Board as a
non-voting member.

The ECGD officers advise the LHCb management and act as LHCb contacts
for all matters related to ECGD. They are available for listening to and
advising - in a confidential manner - colleagues who have witnessed or
have been subject to harassment, discrimination or other inappropriate
behaviour. They help raise awareness in the collaboration for topics
related to ECGD, for example by organizing regular meetings within the
collaboration and by advertising related activities that are ongoing
outside the collaboration.

In this talk we briefly introduce the ECGD office, we share the
experience gained over the last years, and we present our vision for the
future evolution of the ECGD.

Speaker: Marina Artuso (Syracuse University (US))

ecdgArtusoDPF2019.pdf

340 Evolution of Regional, Age and Gender Demographics in the ATLAS Collaboration

The ATLAS Collaboration consists of more than 5000 members, from about 100 different countries. This study presents data showing aspects of the regional, age and gender demographics of the collaboration, including the time evolution over the lifetime of the experiment. In particular the relative fraction of women is discussed, including their share of contributions, recognition and positions of responsibility, and showing how this depends on other demographic measures.

Speaker: Sahal Yacoob (University of Cape Town (ZA))

ATLAS_Demographics_2019.pdf

341 Diversity and Inclusion in CMS and US CMS Collaboration

The CMS collaboration board created a diversity committee in 2017. In this presentation we will discuss the mandate, the experiences of this committee. We will include a statistical analysis of the CMS demographics, as well as that of the US CMS collaboration. We will also discuss some of the activities of the CMS Women’s forum, a self-formed group within CMS.

Speakers: Prof. Meenakshi Narain, Meenakshi Narain (Brown University (US))

DPF-August2019_CMS-Diversity-v3-final.pdf

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University), Ashutosh Kotwal (Duke University (US)), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

342 Shape of Higgs Potential at Future Colliders

Although Higgs boson has been discovered, but its self-couplings are poorly constrained, which leaves nature of Higgs boson undetermined. Motivated from difference potential than Landau-Ginzburg type, we systematically organize various new physics scenarios, psuedo-Goldstone Higgs, Coleman-Weinberg Higgs and Tadpole-induced Higgs, etc. We find that di-Higgs production at 27 TeV HE-LHC have ability to discriminate different Higgs scenarios, while it is necessary to use three Higgs production at 100 TeV collider to fully determine shape of Higgs potential.

Speaker: Jianghao Yu

343 Higgs-Precision Constraints on Colored Naturalness

The presence of weak-scale colored top partners is among
the simplest solutions to the Higgs hierarchy problem. In this talk,
I will examine the constraints on spin-0, spin-1/2, and spin-1 colored
top partners coming solely from their effects on the production and
decay rates of the observed Higgs with a mass of 125 GeV. Constraints
will be derived based on the Higgs precision data from the
LHC and the Tevatron. I will also investigate the expected sensitivity
from the future LHC runs, as well from possible future
electron-positron and proton-proton colliders. Finally, I will consider
various model-building aspects beyond the simplest colored top-partner
scenarios and evaluate how these weaken the current constraints and
expected sensitivities.

Speaker: Yiming Zhong (Stony Brook University)

Yiming_Zhong_DPF_2019.pdf

344 Probing Non-Universal Theories Through Higgs Processes at the LHC

We explored flavor universality violating models by studying dimension-six effective operators which modify the coupling between the first generation up-quarks, Higgs boson and $Z$ boson. Through the use of simulated boosted Higgs strahlung events at both the HL-LHC and HE-LHC, as well as existing ATLAS data for background estimates, projected constraints on the scale of new physics as function of the Wilson coefficient was obtained. The constraints from FCNCs to these flavor violating models will also be discussed.

Speaker: Wen Han Chiu (University of Chicago)

Wen_Han_Chiu_DPF2019.pdf

345 Unearthing kinematic information in WH production

The associated production of a Higgs and a $W$ boson is an important channel not only for observing the Higgs decay to $b$ quark pairs, but also for examining the interactions of the Higgs and gauge fields. Using the inference toolkit MadMiner, which combines matrix element information and machine learning techniques, we examine the sensitivity of this production mode to non-Standard Model (SM) interactions arising in the context of the SM Effective Field Theory. These modern inference techniques maximize the sensitivity to new physics effects by exploiting all the kinematic information in the process and also help us understand how this information is distributed in phase space. In particular, this lets us rigorously evaluate the sensitivity of traditional approaches using histograms of a small number of observables. Based on our study we propose improvements to the recently implemented "Simplified Template Cross Section" templates for the Higgstrahlung process in order to increase the experimental sensitivity of beyond the SM physics at the LHC.

Speaker: Samuel Homiller (YITP, Stony Brook)

homiller_whmadminer_talk.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

346 The COHERENT Experiment

COHERENT is a multi-detector experiment measuring the Coherent Elastic neutrino-Nucleus Scattering (CEvNS) cross section on several target nuclei using a stopped-pion neutrino flux generated at the Spallation Neutron Source (SNS) at Oak Ridge. Despite having a very large cross section, CEvNS had not been observed for four decades after the process was theoretically postulated due to the difficulty detecting the keV-scale nuclear recoil signature. CEvNS were first observed with the COHERENT CsI detector, 14.6 kg of scintillating crystal. In this talk, we detail the CsI result along with ongoing efforts to measure CEvNS on different nuclear targets: Ar, Ge, and Na. Additionally, we discuss our sensitivity to a broad range of physics beyond the standard model such as neutrino non-standard interactions, constraints on the dark matter flux generated by the SNS, and measurement of the weak mixing angle at low-Q2.

Speaker: Daniel Pershey (Duke University)

persheyCOHERENT.pdf

347 COHERENT Plans for D2O detector at the Spallation Neutron Source

The Spallation Neutron Source (SNS) is a pulsed source of neutrons and, as a byproduct of this operation, an intense source of neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investigate coherent elastic neutrino-nucleus scattering (CEvNS) with a suite of detectors. To enable precise cross-section measurements, we plan to reduce an estimated 10% uncertainty in our flux calculation associated with the lack of data for $\pi^\pm$ production from 1 GeV protons on an Hg target. We present here our Geant4 simulation of neutrino production at the SNS and our plans to experimentally normalize this flux with the development of a 670 kg D$_2$O detector. Using the precise cross section calculations for neutrino interactions on deuterium, we will dramatically reduce our flux uncertainty.

Speaker: Rebecca Rapp (Carnegie Mellon University)

dpf2019_rapp.pdf

348 CEvNS with a liquid argon scintillation detector

The COHERENT collaboration is deploying a suite of low-energy detectors in a low-background corridor of the ORNL Spallation Neutron Source (SNS) to measure coherent elastic neutrino nucleus scattering (CEvNS) on an array of nuclear targets employing different technologies. A measurement of CEvNS on a range of nuclei will test the $N^2$-dependence of the CEvNS cross section and further the physics reach of the COHERENT effort. The first step of this program has been realized recently with the observation of CEvNS in a 14.6 kg CsI detector. A 22 kg, single-phase, LAr detector (CENNS-10) started data-taking in 2017 and will provide results on CEvNS from a much lighter nucleus. Results from this detector, along with future outlook, will be presented.

Speaker: Prof. Rex Tayloe (Indiana University)

RTayloeCOHERENTAPSDPF19.pdf

349 The CEvNS Glow of a Supernova

Coherent elastic neutrino-nucleus scattering (CEvNS) is a
neutral-current process in which a neutrino scatters off an entire
nucleus, depositing a tiny recoil energy. The process is important in
core-collapse supernovae and also presents an opportunity for
detection of a burst of core-collapse supernova neutrinos in
low-threshold detectors designed for dark matter detection. This talk
prospects for supernova burst detection via CEvNS in existing and
future large detectors.

Speaker: Kate Scholberg (Duke University)

dpf19.pdf

350 Calorimetric Energy Measurement for Supernova Neutrinos using the DUNE Photon Detection System

The photon detection system (PDS) is a subsystem of the Deep Underground Neutrino Experiment (DUNE). It measures the scintillation light signal and allows determination of the time of occurrence of an event of interest with much higher precision than charge collected from ionization in the liquid argon time-projection chambers and provides a complementary measurement of the deposited energy. This talk will report on simulation studies of calorimetric energy measurement of neutrinos from supernova neutrino bursts (SNB) in DUNE using the PDS.

Speaker: Daniel Pershey (Duke University)

persheyDUNE_PDS.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

351 Review of Photodetector Technology: Status and Future Goals

The detections of photons is fundamental to the detection of particles. The photomultiplier tube (PMT) has been the workhorse of photodetection for over fifty years. It provides robust, low noise, detection of single photons with nanosecond timing. However, we have reached fundamental limits in its performance and production scaling. This talk will review the status of photodetectors from PMT alternatives through new cryogenic sensors operating at the quantum limit.

Speaker: Lindley Winslow (Massachusetts Institute of Technology)

Conference_Winslow_DPF2019_Photodetectors.pdf

352 Developments on Skipper-CCD detectors for dark matter searches

We present a novel "Skipper" readout technology for Charge Coupled Devices (CCDs). Skipper-CCDs have a readout stage that allows the charge contained in every pixel of the CCD to be measured non-destructively multiple times. These multiple samples can be averaged, so that the root-mean-square (RMS) of the measurement noise decreases with the square root of the number of samples. By averaging 4000 samples per pixel, we are able to reach an unprecedentedly low sub-electron RMS noise of 0.06 e-. We discuss various design aspects, the clocking, and the electronic readout noise optimization of the device. Moreover, we present a new Low Threshold Acquisition (LTA) system specifically designed to read out Skipper-CCDs. As an immediate application of this technology, we discuss SENSEI (Sub-Electron Noise Skipper-CCD Experimental Instrument), a dark matter direct detection experiment that takes advantage of the ultra-low read-out noise of Skipper-CCDs to search for electron recoils from dark matter interactions.

Speaker: Dr Miguel Sofo Haro (Fermilab)

dpf_SENSEI-miguel.pdf

353 Large-area Si(Li) detectors for X-ray spectrometry and particle tracking for the GAPS experiment

Large-area lithium-drifted silicon (Si(Li)) detectors, operable 150ºC above liquid nitrogen temperature, have been developed for the General Antiparticle Spectrometer (GAPS) Antarctic balloon mission. GAPS is designed to look for possible signatures of dark matter annihilation or decay in low-energy (kinetic energy < 0.25 GeV/n) cosmic antinuclei, with particle identification based on exotic atom formation and decay. We demonstrate here that these 10 cm-diameter, 2.5 mm-thick, 8-strip detectors can provide the <4 keV (FWHM) energy resolution for X-rays and <10% energy resolution for heavy particle tracks necessary for GAPS to identify cosmic antinuclei, while operating in conditions (~-40ºC and a ~1 Pa) achievable on a long-duration balloon carrying a large-acceptance detector payload. This will be the first large-area, high-temperature Si(Li) detector system suitable for X-ray spectrometry to operate in a space mission. Mass production and calibration of ~1000 detectors has begun for the first GAPS flight, scheduled for late 2021. The detectors, while developed specifically for GAPS, may have other applications, e.g., in heavy nuclei identification at rare isotope facilities.

Speaker: Field Rogers (Massachusetts Institute of Technology)

DPF2019_Rogers_SiLi

354 Recent Advances on Calorimetery

In HEP experiments, calorimeters play a crucial role for measurements of energy, direction and timing of photons, electrons and jets, as well as missing energies. We report recent developments and interesting R&D efforts for various calorimetry technologies. The challenges presented at future HEP experiments and the research directions for advanced calorimeter technologies are discussed.

Speaker: Roger Rusack (University of Minnesota (US))

Roger-Rusack-DPF.pdf

355 Calibration and Performance of the CMS Electromagnetic Calorimeter in LHC Run 2

Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high-resolution electron and photon energy measurements. Excellent energy resolution is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as searches for additional intermediate or high-mass resonances decaying to energetic photons or electrons. The CMS electromagnetic calorimeter (ECAL) is a fundamental instrument for these analyses and its energy resolution is crucial for the Higgs boson mass measurement. Recently the energy response of the calorimeter has been precisely calibrated exploiting the full Run 2 data, aiming at a legacy reprocessing of the data. A dedicated calibration of each detector channel has been performed with physics events exploiting electrons from W and Z boson decays, photons from pi0/eta decays, and from the azimuthally symmetric energy distribution of minimum bias events. This talk presents the calibration strategies that have been implemented and the excellent performance achieved by the CMS ECAL with the ultimate calibration of Run 2 data, in terms of energy scale stability and energy resolution.

Speaker: Badder Marzocchi (Northeastern University (US))

Badder_Marzocchi_DPF_v2.pdf

Top Quark Physics

parallel sessions

Conveners: Louise Skinnari (Northeastern University (US)), Nikolaos Kidonakis (Kennesaw State University), Reinhard Schwienhorst (Michigan State University (US))

356 Theoretical predictions for top-quark production processes

I present theoretical results through three loops and N3LO for soft-gluon corrections in a variety of processes involving top-quark production. In particular, I present results for total cross sections and differential distributions in single-top production and top-pair production as well as in top-quark processes with electroweak bosons and new physics.

Speaker: Nikolaos Kidonakis (Kennesaw State University)

Kidonakis.pdf

357 Measurement of the top quark Yukawa coupling from tt¯ differential cross sections in the lepton+jets final state in proton-proton collisions at sqrt(𝑠)=13 TeV

We present a measurement of the top quark Yukawa coupling derived from the top quark-antiquark (tt¯) differential production cross sections. tt¯ is reconstructed in the lepton+jets channel. Corrections to tt¯ production due to virtual exchange of electroweak bosons, including the Higgs boson, can produce large distortions of differential distributions near the production. Therefore precise measurements of these distributions are sensitive to the value of Yukawa coupling. This analysis is based on data collected by the CMS experiment at the LHC at √𝑠=13 TeV corresponding to an integrated luminosity of 35.8 fb−1. Top quark events are reconstructed with at least three jets in the final state. A novel technique is introduced to reconstruct the tt¯ system for events with one missing jet. This technique enhances the experimental sensitivity in the low invariant mass region, 𝑀tt¯. The data yields in 𝑀tt¯, the rapidity difference |𝑦t−𝑦t¯|, and the number of reconstructed jets are compared with distributions representing different Yukawa couplings. These comparisons are used to extract an upper limit on the top quark Yukawa coupling of 1.67 (1.62 expected) at 95% confidence level.

Speaker: Prof. Regina Demina (University of Rochester)

RDemina_TopYukawa_DPF.pdf

RDemina_TopYukawa_DPF.pptx

358 Prospects for Measuring the Four-Top Production Cross Section using 139fb$^{-1}$ of Data in $pp$ Collisions at $\sqrt{s} = $ 13 TeV with the ATLAS Detector

The production of four top-quarks, a rare final state predicted by the Standard Model, has never been seen at the 3$\sigma$ level. Additionally, this final state may be particularly sensitive to physics beyond the Standard Model. The ATLAS search for four top-quark production using 2015-2018 data collected at $\sqrt{s} = $ 13 TeV, with a combined luminosity of 139 fb$^{-1}$, is in progress. One important aspect to improve the measurement is the optimization of variables for jets, including $b$-tagged and re-clustered jets, in order to isolate signal events from the primary $t\bar{t}$ background in the 1-lepton and dilepton opposite-sign channels. By performing profile likelihood ratio fitting, we evaluate and report the significance associated with alternative selection criteria on jet variables.

Speaker: Rachel Elizabeth Lindley (University of Arizona (US))

Four-Top Search Presentation.pdf

359 Search for standard model production of four top quarks

This talk describes efforts towards a first measurement of the standard model production of four top quarks with results based on up to the full Run 2 dataset. It includes implications of this measurement to constrain properties of the Higgs Boson and new physics scenarios including dark matter.

Speaker: Caleb Arthur Fangmeier (University of Nebraska Lincoln (US))

FourTop_DPF2019.pdf

15:30 Coffee Break

Accelerators

Parallel Sessions

Conveners: Patric Muggli (Max Planck Institute for Physics), Silvia Verdú Andrés (Brookhaven National Laboratory BNL), Vladimir Shiltsev (Fermilab)

360 CBETA: a 4-pass superconducting ERL with combined permanent magnet return arc

Beam commissioning is currently in progress for the CBETA ERL recently built at Cornell University in collaboration with BNL. This machine has a 6MeV injector and 36MeV main superconducting RF module at ~1.3GHz frequency. The beam passes through the main RF up to four times accelerating and four times decelerating, before being dumped at 6MeV. These four energies (42, 78, 114, 150MeV) are returned to the RF by a racetrack-shaped return loop of fixed-field permanent magnets. These magnets have been designed so that all four energies are stably transported through the same R=25mm good field aperture. Between the RF and return loop on either side, the four energies are split apart for adjustment to tune energy recovery and optics performance. At the date of writing, beam commissioning has made one turn through the permanent magnet loop at 42MeV including orbit correction to <1mm.

Speaker: Stephen Brooks (Brookhaven National Laboratory)

Brooks_CBETA_DPF2019.pptx

361 The Chilling Recount of an Unexpected Discovery: First Observations of the Plasma-Cascade Instability in the Coherent Electron Cooling Experiment

Coherent electron Cooling (CeC) is a sophisticated technique which has the potential to significantly reduce the cooling time in high-energy hadron machines and provide a substantial luminosity boost in high-intensity hadron-hadron and electron-hadron colliders. The CeC Proof of Principle (PoP) accelerator is a unique facility which is currently under commissioning at Brookhaven National Laboratory (BNL). The accelerator utilizes one of the few currently operating superconducting RF (SRF) photo injectors with a warm cathode, which has demonstrated an exceptional performance over the last few years.

In this dissertation we present the main results of the CeC PoP commissioning with an emphasis on the performance of the SRF photo injector. Special focus will be given to unexpected experimental results obtained during the last year of operation, and the discovery of a previously unknown type of microwave instability. We call this new phenomenon a micro-bunching Plasma Cascade Instability (PCI).

Speaker: Irina Petrushina (Stony Brook University)

IrinaPetrushina_APSDPF2019.pdf

362 AWAKE: a proton-driven plasma-based accelerator for high-energy physics applications

AWAKE is a plasma-based acceleration experiment aiming at accelerating electrons to multi GeV to multi-TeV energies with a gradient of around 1GeV/m. Such a high gradient and large energy gains are in principle possible by using relativistic proton bunches to drive wakefields in plasma. Proton bunches, such as those produced by the CERN SPS or LHC carry large amounts of energy, allowing for large energy gains. However, they are too long to drive large amplitude wakefields. AWAKE [1] uses a seeded self-modulation process to transform the long bunch in a train of bunches shorter than, and separated by the wakefields period. Experimental results demonstrate many of the characteristics of the self-modulation process [2,3]. External electron injection experiments showed energy gains from 19MeV to 2GeV [4]. Plans are being drawn for future experiments aiming at producing bunches with parameters suitable for fixed target experiments in the mid-term and electron/proton collision experiments.

[1] P. Muggli et al. (AWAKE Collaboration), Plasma Physics and Controlled Fusion, 60(1) 014046 (2017)

[2] M. Turner et al. (AWAKE Collaboration), Phys. Rev. Lett. 122, 054801 (2019)

[3] AWAKE Collaboration, Phys. Rev. Lett. 122, 054802 (2019)

[4] AWAKE Collaboration, Nature 561, 363–367 (2018)

Speaker: Patric Muggli (Max Planck Institute for Physics)

Muggli

363 Progress on laser-driven plasma accelerators for high-energy physics applications

Laser-driven plasma-based accelerators are capable of generating ultra-high accelerating gradients, several orders of magnitude larger than conventional accelerators. These high gradients offer the potential for extremely compact devices delivering high energy particle beams. In this talk, I will describe recent progress on laser-plasma accelerators, including the generation electron beams up to 8 GeV in a single laser-plasma accelerator at Berkeley Lab. Achieving beam energies relevant for high-energy physics applications requires staging of laser-plasma accelerators with multi-GeV energy gain per stage. Experiments have demonstrated the coupling of two stages at low energies, and I will describe preparations that are underway for staging experiments at multi-GeV energies. This work is part of long term development of plasma accelerators towards future TeV-class colliders.

Speaker: Carl Schroeder (Lawrence Berkeley National Laboratory)

DPF19-Schroeder-v2.pdf

364 Investigation of plasma-based accelerators at Stony Brook University

Plasma-based particle accelerators are promising candidates for future free electron laser and collider applications as they can sustain accelerating gradients that are three orders of magnitude higher than those of conventional RF-based accelerators. Improving the quality of the electron beams emerging from these accelerators is an area of intense focus within the field. In this talk, I will discuss the research effort in this area led by Stony Brook University in both beam-driven plasma wakefield accelerators (PWFA) and laser-driven wakefield accelerators (LWFA). In particular, I will discuss the use of a specialized injection technique, known as beam-induced ionization injection, to achieve low energy spread in PWFAs, where energy is transferred from a relativistic drive beam to a trailing bunch in a plasma wake. Additionally, the application of a linac-produced electron beam to probing the fields of an LWFA will be discussed. The latter work will be discussed in the context of the CO$_2$ laser at the ATF facility of the Brookhaven National Laboratory, which is unique source capable of generating $<$2 ps-long, multi-TW laser pulses in the mid-IR (9-10 $\mu$m) regime. These methods are investigated in numerical simulations using the Particle In Cell code OSIRIS [R.A.Fonseca et al., LNCS (2331) 342, 2002].

Simulations were conducted on NERSC facility, operated under Contract No. DE-AC02-5CH11231, and of SEAWULF at Stony Brook University.

Speaker: Navid Vafaei-Najafabadi (Stony Brook U.)

Vafaei-APS-DPF V3.pdf

365 Experiments with Metallic Metamaterial Structures for Wakefield Acceleration

Xueying Lu, Julian Picard, Michael Shapiro, Ivan Mastovsky, Richard Temkin
Massachusetts Institute of Technology, Cambridge, MA 02139

Manoel Conde, John Power, Jiahang Shao, Maomao Peng, Eric Wisniewski, Scott Doran
Argonne National Laboratory, Lemont, IL 60459

Chunguang Jing
Euclid Techlabs LLC, Solon, Ohio 44139, USA

In this talk, we present experiments on metallic metamaterial structures for high-gradient wakefield acceleration.
High energy particle accelerators at the TeV scale are crucial to the next big discovery in particle physics. Structure-based wakefield acceleration (SWFA) is a promising approach to make compact high-energy particle colliders by achieving higher accelerating gradient compared to conventional RF accelerators. In the SWFA regime, a drive bunch travels through an RF structure and transfers its beam energy into an intense wakefield with a short pulse length; then a trailing witness bunch can be accelerated if positioned at the correct phase in the wakefield.
The metamaterial structure we designed for SWFA is a “wagon wheel” periodic structure at X-band, which supports a fundamental transverse magnetic mode with a negative group velocity leading to reversed-Cherenkov radiation. The period of the structure, 2 mm, is much smaller than the wavelength at X-band. In this way, the metamaterial structure performs almost as a continuous medium with the novel feature of double negative permittivity and permeability. The metamaterial approach provides large room for improvements of the structure performance.
Two “wagon wheel” structures have been tested so far at the Argonne Wakefield Accelerator (AWA). The first structure is 8 cm long with 40 periods. Single 45 nC electron bunches of 65 MeV traversing the structure generated up to 25 MW in 2 ns pulses at 11.4 GHz, in excellent agreement with theory. Two bunches of 85 nC with appropriate temporal spacing generated up to 80 MW by coherent wakefield superposition, the highest rf power that metamaterial structures ever experienced without damage. The reversed-Cherenkov radiation was also clearly verified in the experiment.
A second structure of the same wagon wheel design with 100 periods at 11.7 GHz has been recently tested using trains of up to 8 bunches, with 25 nC per bunch and a bunch rep rate of 1.3 GHz. Preliminary analysis indicates an output power level of about 200 MW at 11.7 GHz in a 4 ns (FWHM) pulse.
These results demonstrate the unique features of metamaterial structures that are very attractive for future high-gradient wakefield accelerators, including two-beam and collinear accelerators. Advantages include the high shunt impedance for high-power generation and high-gradient acceleration, the simple and rugged structure, and a large parameter space for optimization.

Speaker: Xueying Lu (SLAC)

Lu_APSDPF_19.pdf

Astroparticles & CMB

Conveners: Kerstin Perez (MIT), Laura Newburgh, Lindsey Bleem (Argonne National Laboratory)

366 Properties of secondary cosmic-ray nuclei by AMS on ISS

Properties of secondary cosmic rays measured by Alpha Magnetic Spectrometer on ISS will be presented

Speakers: Yi Jia (Massachusetts Inst. of Technology (US)), Xiaoting Qin (Massachusetts Inst. of Technology (US))

YiJia_Secondary_DPF2019.pdf

367 Cosmic Ray Isotopes measured by AMS

The properties of cosmic ray isotopes of H, He and Li, measured by AMS will be presented.

Speaker: Francesco Dimiccoli (Universita degli Studi di Trento è INFN (IT))

DPF19 (3).pdf

368 Anisotropy of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the ISS

Analysis of anisotropy of the arrival directions of galactic protons, electrons and positrons has been performed with the Alpha Magnetic Spectrometer on the International Space Station. These results allow to differentiate between point-like and diffuse sources of cosmic rays for the explanation of the observed excess of high energy positrons. The AMS results on the dipole anisotropy are presented along with the discussion of implications of these measurements.

Speaker: Miguel Molero Gonzalez (Centro de Investigaciones Energéti cas Medioambientales y Tecno)

MMolero_DPF_Anisotropy_20190801.pdf

369 Observation of Complex Time Structures in the Cosmic Ray Fluxes by the Alpha Magnetic Spectrometer on the ISS

We present high-statistics, precision measurements by AMS of the detailed time and rigidity dependence of the primary cosmic-ray electron, positron, proton and helium fluxes over 79 Bartels rotations from May 2011 to May 2017 in the energy range from 1 to 50 GeV. For the first time, the charge-sign dependent modulation during solar maximum has been investigated in detail by leptons alone. We report the observation of short-term structures on the timescale of months coincident in all the fluxes. These structures are not visible in the positron-to-electron flux ratio. The precision measurements across the solar polarity reversal show that the ratio exhibits a smooth transition over ~800 days from one value to another.

Speaker: Davide Rozza (Universita & INFN, Milano-Bicocca (IT))

DPF2019_Rozza_Presentation.pdf

Beyond Standard Model

parallel sessions

Conveners: Christopher Rogan (The University of Kansas (US)), Lawrence Lee Jr (Harvard University (US)), Stefania Gori (UC Santa Cruz), Verena Ingrid Martinez Outschoorn (University of Massachusetts (US))

370 PHYSICS BEYOND SM WITH KAONS FROM NA62

The decay K+→π+vv, with a very precisely predicted branching ratio of less than 10exp[-10], is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+→π+vv with a decay-in-flight technique. NA62 took data so far in 2016-2018. Statistics collected in 2016 allowed NA62 to reach the Standard Model sensitivity for K+→π+vv ̅, entering the domain of 10exp[-10] single event sensitivity and showing the proof of principle of the experiment. Thanks to the statistics collected in 2017, NA62 surpasses the present best sensitivity. The analysis strategy is reviewed and the preliminary result from the 2017 data set is presented.
A large sample of charged kaon decays into final states with multiple charged particles was collected in 2016-2018. The sensitivity to a range of lepton flavor and lepton number violating kaon decays provided by this data set improves over the previously reported measurements. Results from the searches for these processes with a partial NA62 data sample are presented.

Speaker: Roberta Volpe (UCLouvain (Belgium))

RVolpe_DPF2019pnn .pdf

371 Nonminimal CPT violation in neutral-meson oscillations

Neutral mesons provide a unique opportunity to study indirect CPT violation arising from Lorentz-violating backgrounds coupled to quark fields. The existing formalism is extended using an effective scalar field theory, and the theoretical description of indirect CPT violation is generalized to include operators of arbitrarily large mass dimension. Estimates of the attainable sensitivities of current experiments are presented.

Speaker: Benjamin Edwards (Indiana University)

mesons_DPF_2019.pdf

mesons_DPF_2019.pptx

372 Preliminary Charged Particle Results from the AlCap Experiment

Observation of neutrinoless muon-to-electron conversion in the presence of a nucleus would be unambiguous evidence of physics Beyond the Standard Model. Two experiments, COMET at J-PARC and Mu2e at Fermilab, will search for this process in the next few years. These experiments will provide upper-limits on this branching ratio up to 10,000 times better than previously published. To successfully probe unexplored parameter spaces of new physics, COMET/Mu2e will stop a substantial number of muons from high-intensity muon beams while remaining sensitive to a conversion interaction as rare as less than 1 in $10^{16}$ stops. The experiments require precise measurements of Standard Model processes that will be used in COMET/Mu2e for normalization and for understanding backgrounds and noise.
COMET/Mu2e developed a joint venture, the AlCap Experiment, to measure particle emission spectra from muonic interactions in a number of materials. As a major source of damage and background hits in COMET/Mu2e detectors, AlCap measured the charged particle and neutron spectra following nuclear capture on the candidate target materials aluminum and titanium, as well as in a number of structural and shielding materials capable of producing other backgrounds. Additionally, COMET/Mu2e are exploring schemes for determining the number of muon stops via AlCap’s measurement of the photon spectra following both atomic and nuclear capture.
AlCap performed three data-taking campaigns between 2013 and 2015 at the Paul Scherrer Institut in Switzerland, each geared towards different measurements, of photon, neutron, and charged particle emission due to interactions of muons stopping in materials. During the final campaign, AlCap collected heavy charged particle data. Preliminary results will be presented of the proton emission spectrum from this data set.

Speaker: John Quirk (Boston University)

JQuirk_DPF_Aug2019.pdf

373 The REDTOP experiment: Rare Eta Decays with a TPC for Optical Photons

The $\eta$ and $\eta'$ mesons are almost unique in the particle universe since they are Goldstone boson and the dynamics of their decay are strongly constrained.
Because the eta has no charge, decays that violate conservation laws can occur
without interfering with a corresponding current. The integrated eta meson
samples collected in earlier experiments have been about ~$10^9$ events, dominated by the WASA at Cosy experiment, limiting considerably the search for such rare decays. A new experiment, REDTOP, is being proposed, either at the proton Delivery Ring of Fermilab or at the PS at CERN, with the intent
of collecting more than $10^{13}$ eta/year ($10^{11}$ eta'/year) for studying of rare $\eta$ decays.
Such statistics are sufficient for investigating several symmetry violations,
and for searches of new particles beyond the Standard Model. Recent studies have indicated that REDTOP has vey good sensitivity to processes that couple to the Standard Model through three so-called portals: the vector, the scalar and the axion portal. An upgraded version of the detector will be proposed, at a later stage, for running at PIP-II, where the $\eta$ mesons will be produced with tagging.
The physics program, the accelerator systems and the detector for REDTOP will be
discussed during the presentation.

Speakers: Prof. Corrado Gatto (Istituto Nazionale di Fisica Nucleare and Northern Illinois University), The REDTOP Collaboration

DPF20190801.pdf

DPF20190801.pptx

374 The Mu3e experiment

The Mu3e experiment searches for the charged lepton flavour violating 𝜇+ → 𝘦+ 𝘦+ 𝘦- decay and it aims at reaching an ultimate sensitivity of 10^-16 on the branching fraction of the 𝜇+ → 𝘦+ 𝘦+ 𝘦- decay, four orders of magnitude better than the current limit B(𝜇+ → 𝘦+ 𝘦+ 𝘦-)<10^-12 set by the SINDRUM experiment. The experiment will be hosted at the Paul Scherrer Institute (Villigen, Switzerland) which delivers the most intense low momentum continuous muon beam in the world (up to few x 10^8 𝜇+/s).
In order to be sensitive to the signal at this so high level, to reject the background and to run at the intensity beam frontier excellent detector performances are needed. To match those requests the experiment has been design based on completely new technologies. Extensive test beams have been performed to validate the detector design. The collaboration is concluding the detector R&D phase and is approaching the pre-engineering phase. A pre-engineering run is foreseen next year with sub-modules of each sub-detector followed by a full assembled pre-engineering run for 2021. The physics runs is expected to follow and will take at least three years of data taking. A review of the Mu3e experiment and its physics case will be given.

Speaker: Angela Papa (PSI and UniPi/INFN)

Mu3e_APS2019_Papa.pdf

375 Higgs bosons with large couplings to light quarks

We study theories of extended Higgs sectors with large couplings to light quarks. We show that these theories arise naturally from simple UV completions with spontaneously broken flavor symmetries, which ensure strong suppression of FCNCs. In these theories, extra Higgses are copiously produced at the LHC, and if they mix with the 125 GeV Higgs they lead to dramatic enhancements of its Yukawa couplings. We show an interesting complementarity between flavor and dijet probes of such Higgs sectors, and measurements of the 125 GeV Higgs Yukawas that could be performed at the ILC. We also motivate the need to explore generic models of new physics coupled preferentially to light quarks, and the development of experimental techniques targeting this scenario, such as light quark taggers.

Speaker: Daniel Egana-Ugrinovic (CN Yang Institute, Stony Brook University)

SFV.pdf

Computing, Analysis Tools, & Data Handling

parallel sessions

Conveners: Bo Jayatilaka (Fermi National Accelerator Lab. (US)), Michael Kirby (Fermi National Accelerator Laboratory), Mike Hildreth (University of Notre Dame (US)), Peter Onyisi (University of Texas at Austin (US))

376 Computing and Machine Learning for Detector R&D (Summary of CPAD2018)

In this talk, I will summarize and highlight the work of the Computing and Machine Learning session from the New Technologies for Discovery IV: CPAD Instrumentation Frontier workshop at Brown University in December 2018. This talk will cover on-going research and development efforts in this area described in the forthcoming New Technologies for Discovery Report.

Speaker: Sergei Gleyzer (University of Florida (US))

DPF_Sergei_Gleyzer.pdf

377 Software Upgrades for the HL-LHC and HEP in the 2020s

During 2016-2017 the worldwide HEP community met over a series of workshops to prepare a roadmap for the software R&D needed to prepare for the data and computational challenges of the High Luminosity LHC and other HEP experiments in the 2020s. This process was organized by the HEP Software Foundation and the outcome was a community white paper with title “A Roadmap for HEP Software and Computing R&D for the 2020s”.
The community is now proceeding with elements of that plan. In particular, the NSF in the US has funded the Institute for Research and Innovation in Software for High Energy Physics (IRIS-HEP). IRIS-HEP is intended to serve as an active center for software R&D, function as an intellectual hub for the larger community-wide software R&D efforts, and transform the operational services required to ensure the success of the HL-LHC scientific program. Three high-impact R&D areas will leverage the talents of the U.S. university community: (1) the development of innovative algorithms for data reconstruction and triggering, (2) the development of highly performant analysis systems that reduce `time-to-insight’ and maximize the HL-LHC physics potential and (3) the development of data organization, management and access systems for the community’s upcoming Exabyte era. IRIS-HEP will also sustain investments in distributed high-throughput computing (DHTC) for the LHC through the Open Science Grid and build an integration path (the Scalable Systems Laboratory) to deliver the output of its R&D activities into the distributed and scientific production infrastructures.
In this talk we will describe the current R&D activities of IRIS-HEP and the wider community to implement the roadmap. We will also discuss related activities to implement a vision for the training of young researchers in the computational and data science tools and techniques that are required to be a successful researcher today.

Speaker: Peter Elmer (Princeton University (US))

IRIS-HEP-APS-DPF-2019.pdf

378 Evolving CMS offline computing towards LHC Run3 and HL-LHC

The offline software and computing systems of the LHC experiments continue to evolve to meet the challenges of delivering data effectively to LHC analysts. Looking to Run 3 and high-luminosity LHC, the data rates required by the HL-LHC physics program will far outstrip what can be provided by the current analysis and production computing approaches. In this presentation, we will discuss how the entire offline system of the CMS experiment is evolving in anticipation of increased data volumes, increased rate of pileup interactions and the evolution of computing technology. We will discuss short-term developments and longer-term ideas including changes to distributed analysis-data structures and data reduction approaches; adoption of modern software development practices; the use of hardware accelerators; and novel approaches to simulation, reconstruction and analysis algorithms.

Speaker: David Lange (Princeton University (US))

dpf_lange_2019.pdf

379 Large-scale HPC deployment of Scalable CyberInfrastructure for Artificial Intelligence and Likelihood Free Inference (SCAILFIN)

The NSF-funded Scalable CyberInfrastructure for Artificial Intelligence and Likelihood Free Inference (SCAILFIN) project aims to develop and deploy artificial intelligence (AI) and likelihood-free inference (LFI) techniques and software using scalable cyberinfrastructure (CI) built on top of existing CI elements. Specifically, the project has extended the CERN-based REANA framework, a cloud-based data analysis platform deployed on top of Kubernetes clusters that was originally designed to enable analysis reusability and reproducibility. REANA is capable of orchestrating extremely complicated multi-step workflows, and uses Kubernetes clusters both for scheduling and distributing container-based workloads across a cluster of available machines, as well as instantiating and monitoring the concrete workloads themselves.

This work describes the challenges and development efforts involved in extending REANA and the components that were developed in order to enable large scale deployment on High Performance Computing (HPC) resources, including the development of an abstraction layer that allows the support of different container technologies and different transfer protocols for files and directories between the HPC facility and the REANA cluster edge service from the user's workflow application.

Using the Virtual Clusters for Community Computation (VC3) infrastructure as a starting point, we implemented REANA to work with a number of differing workload managers, including both high performance and high throughput, while simultaneously removing REANA's dependence on Kubernetes support at the workers level. Performance results derived from running AI/LFI training workflows on a variety of large HPC sites will be presented.

Speakers: Mike Hildreth (University of Notre Dame (US)), Kenyi Paolo Hurtado Anampa (University of Notre Dame (US))

Hildreth_DPF_2019.pdf

Dark Matter

parallel sessions

Conveners: Benjamin Safdi, Lindley Winslow (Massachusetts Institute of Technology), Rupak Mahapatra (Texas A&M University)

380 The Snowball Chamber: An Alternative Detection Method for Dark Matter

The cloud and bubble chambers have historically been used for particle detection, capitalizing on supersaturation and superheating respectively. We present now on the snowball chamber, which utilizes a supercooled liquid. In our prototypes, an incoming particle triggers crystallization of purified water. We demonstrate that water is supercooled for a significantly shorter time with respect to control data in the presence of AmBe and 252Cf neutron sources. A greater number of multiple nucleation sites are observed as well in neutron calibration data, as in a PICO-style bubble chamber. Similarly, gamma calibration data indicate a high degree of insensitivity to electron recoils inducing the phase transition, making this detector potentially ideal for dark matter searches seeking nuclear recoil alone. We will explore the possibility of using this new technology for that, updating everyone on new results that will be a prelude of our newest generation tests.

Speaker: Mr Joshua Martin (University at Albany)

snowball_dpf-compressed.pdf

381 HeRALD: Dark Matter Direct Detection with Superfluid 4He

HeRALD, the Helium Roton Apparatus for Light Dark Matter, will use a superfluid helium target to study the sub-GeV dark matter parameter space. The HeRALD design is sensitive to all signal channels produced by nuclear recoils in superfluid helium: singlet and triplet excimers, as well as phonon and roton vibrational excitations. Excimers are detected via calorimetry in and around the superfluid helium. Vibrational excitations eject helium atoms from the superfluid-vacuum surface which are detected by adsorption onto calorimetry above the surface. I will discuss the design, sensitivity projections, and R&D for the HeRALD experiment.

Speaker: Harold Pinckney (University of Massachusetts at Amherst)

Pinckney_DPF_2019.pdf

382 R&D towards hydrogen-doped LXe TPCs

Next generation liquid xenon TPCs, like LZ, will offer an order of magnitude improvement in sensitivity to WIMP dark matter with masses above 10 GeV. The introduction of a low-Z element, like hydrogen, into a large xenon TPC would take advantage of the excellent self-shielding xenon environment, while potentially extending sensitivity down to ~50 MeV WIMP masses. This talk will describe ongoing R&D efforts to quantify the dissolution of H2 in LXe and the response of such a mixture in a small test chamber at Fermilab.

Speakers: Alissa Monte, Alissa Monte

DPF_HydroX_Monte.pdf

383 LBECA: Sub-GeV Dark Matter Search with Xenon

The LBECA collaboration plans to optimize xenon time projection chamber (TPC) sensitivity to sub-GeV dark matter by focusing on few-electron ionization signals. Previous experiments such as XENON1T and LUX have observed an increase in few-electron backgrounds up to 100s of milliseconds after energetic particle interactions, which limits their sensitivity to such low-energy interactions. The exact origin of these signals is currently unknown, but hypotheses include delayed extraction of ionization electrons from the liquid-gas interface and trapping of charges on electronegative impurities. LBECA looks to investigate and reduce this background through several methods, such as reduction of impurities through novel detector construction and materials, and improved electron extraction through infrared stimulation or increased extraction field. Small xenon TPCs are currently being operated at different institutions (LBNL, LLNL, Purdue, UCSD) to explore the origins of these backgrounds and implement reduction strategies, while colleagues at Stony Brook complement the work with simulation and modeling. LBECA will combine technological improvements to achieve world-leading sensitivity to sub-GeV dark matter interactions using a dedicated liquid xenon TPC.

Speaker: Michael Takashi Clark (Purdue University)

LBECA_ClarkAug1.pdf

384 Forecasting dark matter searches at next-generation direct detection experiments in light of astrophysical uncertainties: Method

Analyses of the latest Gaia data release (DR2) by various groups have revealed that the dark matter (DM) halo around the solar neighborhood is in disequilibrium, and an O(1) fraction of the DM may have been accreted during recent dwarf galaxy mergers. These results indicate a departure from the Standard Halo Model (SHM) of DM velocity distribution, which could significantly affect DM signals at direct detection experiments. In this talk, we parametrize the local DM velocity distribution through a model with three distinct components: an isotropic halo, an anisotropic substructure component (the so-called Gaia Sausage), and a coherent stream of DM associated with the S1 stellar stream. We illustrate the effect of astrophysical uncertainties on discriminating signals from various DM models using the novel framework of information geometry. In particular, we review the Euclideanized signal method introduced by Edwards & Weniger that allows us to rapidly scan over a large-dimensional parameter space without resorting to computationally expensive Monte Carlo simulations that rely on a finite number of arbitrary benchmark points.

Speaker: Jatan Buch (Brown University)

dpf_2019_buch.pdf

385 Forecasting dark matter searches at next-generation direct detection experiments in light of astrophysical uncertainties: Results

The Non-Relativistic Effective Field Theory (NREFT) provides an economic parametrization of different possible interactions between dark matter (DM) and the target nucleus that could be probed by direct detection. We consider a diverse set of Galilean-invariant NREFT operators with different spin, momentum and velocity dependence, for both light and heavy mediators, and investigate the effect of astrophysical uncertainties on reconstruction of DM signal parameters using the Euclideanized signal method (which is discussed in the previous talk). We forecast the prospects for accurate parameter reconstruction at next-generation direct detection experiments. Focusing on models with light DM and light mediators, we also highlight parts of the parameter space where experiments won’t be limited by astrophysical uncertainties.

Speaker: Shing Chau Leung (Brown University)

dpf_2019_Leung.key

dpf_2019_Leung.pdf

386 Strong New Limits on Light Dark Matter from Neutrino Experiments

The non-detection of GeV-scale WIMPs has led to increased interest in more general candidates, including sub-GeV dark matter. Direct detection experiments, despite their high sensitivity to WIMPs, are nominally blind to dark matter much lighter than $\sim1$ GeV. Recent work has shown that cosmic rays scattering with sub-GeV dark matter would both alter the observed cosmic ray spectra and produce a flux of relativistic dark matter, which would be detectable with both traditional dark matter experiments and neutrino detectors. Using data, detectors, and analysis techniques not previously considered, we substantially increase the regions of parameter space excluded by neutrino experiments for both dark matter-nucleon and dark matter-electron scattering.

Speaker: Christopher Cappiello (Ohio State University)

DPF Cappiello 2.pdf

Diversity & Inclusion

parallel sessions

Conveners: Brian Beckford (University of Michigan), Corrinne Mills (University of Illinois at Chicago (US))

387 PARTY CALL PHYSICS: when access and physics collide

The American education system has historically assumed that physics students can speak and hear, and has historically excluded signed languages and their users. Consequently, there is a dearth of conceptually accurate and linguistically appropriate signs for even basic technical concepts. This talk will provide a brief history of my (lack of) access to education and being the first Deaf in the world to get a PhD in particle physics. Along the way, I've been developing words in American Sign Language and training my sign language interpreters to ensure accurate, complete communication. These developed signs can also benefit non-signers by changing how particle physicists communicate and collaborate in a large international experiment among colleagues of diverse backgrounds, cultures, and languages.

Speaker: Giordon Holtsberg Stark (University of California,Santa Cruz (US))

20190801_DPF2019_DiversityInclusion.pdf

388 Efforts to improve inclusion and diversity in Physics

The number of bachelor's and doctoral degrees in physics and astronomy earned each year continues on an upward trend. Despite that, degrees earned by underrepresented minority (URM) groups still accounts for a small percentage of those degrees, with an overall downward trend for Black$/$African-American students. National societies such as the American Physical Society (APS) and the American Institute of Physics (AIP) have acknowledged there must be action taken to improve the situation. APS has started the National Mentoring Network, the APS Bridge Program, sponsored the CuWiP conferences, and published the LGBT climate in physics report. AIP has recently launched the TEAM-UP Task Force to investigate the reasons for the persistent underrepresentation of African American undergraduate students in physics and astronomy.

This presentation will recap levels of representation in physical sciences and discuss current national efforts aimed at improving diversity and inclusion in physics.

Speaker: Dr Brian Beckford (University of Michigan)

Beckford_DPF_DEI.pdf

389 Panel Discussion

DPFDEI.pdf

Higgs & Electroweak Physics

parallel sessions

Conveners: Alberto Belloni (University of Maryland (US)), Ashutosh Kotwal (Duke University), Ashutosh Kotwal (Duke University (US)), Caterina Vernieri (SLAC National Accelerator Laboratory (US)), David Sperka (Boston University (US)), Zhen Liu (U of Maryland)

390 Evidence for the WWW triboson production with the ATLAS detector

The joint production of three vector bosons is a rare process in the Standard Model. Studies of triboson production can test the non-Abelian gauge structure of the SM theory and any deviations from the SM prediction would provide hints of new physics at higher energy scales. This talk presents the first evidence of $WWW$ triboson production by the ATLAS collaboration using data collected in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector between 2015 and 2017, corresponding to an integrated luminosity of 79.8 fb$^{-1}$. In the measurement, events containing two same-sign leptons and at least two jets are selected for $WWW\to\ell\nu\ell\nu qq$ channel, while events with three leptons without any same-flavor opposite sign leptons are used for $WWW \to \ell\nu\ell\nu\ell\nu$ channel.

Speaker: Wenhao Xu (University of Michigan (US))

Wenhao Xu - DPF 2019.pdf

391 Search for heavy ZZ resonances in the $\ell\ell\ell\ell$ and $\ell\ell\nu\nu$ final states with the ATLAS detector

The search for heavy resonances decaying into a pair of Z bosons leading to final states with four-charged leptons ($\ell\ell\ell\ell$) or two-charged leptons plus two neutrinos ($\ell\ell\nu\nu$) will be reported. Data used in the analysis were collected by the ATLAS experiment during Run II and correspond to a total integrated luminosity of 139 fb$^{-1}$. Different mass ranges for the hypothetical resonances are considered, depending on the final state and model. The different ranges span between 300 and 3000 GeV. The results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II two-Higgs-doublet models, while those for the spin-2 resonance are used to constrain the Randall–Sundrum model with an extra dimension giving rise to spin-2 graviton excitations.

Speaker: Jing Li (University of Michigan (US) / Shanghai Jiao Tong University (CN))

DPF-jli-2019-08-01.pdf

392 Recent measurements of electroweak boson properties at D0

We present a measurement of the shape of the Z boson rapidity for $Z/\gamma^{*} \to\mu^+\mu^- $ produced in $ p\bar p$ collision at $\sqrt s=$1.96 TeV. We use 8.6 fb$^{-1}$ of $ p\bar p$ data collected by the D0 detector at the Tevatron collider. The results are compared to NNLO QCD predictions using different sets of Parton Density Functions. We also present a measurement of the shape of the transverse momentum distribution for W boson in the $W \to e\nu$ decay channel using 4.2 fb$^{-1}$ of $ p\bar p$ data at $\sqrt s=$1.96 TeV.

Speaker: Kenneth Bloom (University of Nebraska Lincoln (US))

WpT_dpf2019_190801.pdf

393 Study of VBS ZZ production associating two jets with the ATLAS experiment

The study of vector boson scattering (VBS) in $ZZjj$ events produced in proton-proton collisions with a center of mass energy of 13 TeV will be reported. Data used in analysis were collected by the ATLAS experiment during Run II and correspond to a total integrated luminosity of 139 fb$^{−1}$. Final states with four-charged lepton ($4l$) or two-charged lepton plus two neutrinos ($2l2\nu$) from the $ZZ$ decays produced in association with two forward/backward jets are used to extract the VBS $ZZjj$ signal. The measurement of the inclusive $ZZjj$ production cross section will be reported. The measurement of the Electroweak VBS $ZZ$ signal strength will be presented as well.

Speaker: Shuzhou Zhang (University of Michigan (US))

DPF-0801-VBSZZ-Shuzhou.pdf

394 Precision measurements of Zand W boson properties at CMS

Recent results on the measurement of the Z and W boson properties and production cross-section at CMS will be presented in this talk, with emphasis on precision measurements.

Speaker: Jessica Lovelace Rainbolt (Northwestern University (US))

ZW_CMS_JLRainbolt.pdf

Neutrino Physics

parallel sessions

Conveners: Kendall Mahn (MSU), Michelle Dolinski (Drexel University), Peter Denton (Brookhaven National Laboratory), Roxanne Guenette (Harvard University)

395 The NOvA Test Beam Program

NOvA is a long-baseline off-axis accelerator neutrino experiment. By measuring muon neutrino disappearance and electron neutrino appearance between the NOvA Near Detector and the 14 kiloton Far Detector, the experiment is addressing outstanding questions in neutrino physics, including the determination of the neutrino mass hierarchy and existence of leptonic CP violation. The NOvA Test Beam program will use a scaled-down NOvA detector to sample beams of tagged pions, protons, electrons, and kaons in the momentum range of 0.3 - 2 GeV/c. It will further the NOvA physics reach by providing a deeper understanding of the detector calibration, response, and energy scale which are among the largest systematic uncertainties in the oscillation analysis. Additionally it will provide single-particle data sets for detailed studies of event reconstruction and particle identification techniques. In this talk I will present the current status and future plans of the NOvA Test Beam effort.

Speaker: Andrew Sutton (University of Virginia)

Presentation.pdf

396 Upgrade of the T2K Near Detector ND280

In view of the J-PARC program of upgrades of the beam power, the T2K collaboration is preparing upgrades of the neutrino beamline and near detector, ND280, towards an increase of the exposure aimed at establishing leptonic CP violation at 3 σ level for a significant fraction of the possible δCP values. To reach this goal, the upgrade of the ND280 has been aimed at reducing the overall statistical and systematic uncertainties to the needed level, better than 4%.
The upgraded detector comprises the totally active Super-Fine-Grained-Detector (SuperFGD), two High Angle TPC (HA-TPC) and six TOF planes. The SuperFGD, a highly segmented scintillator detector, acting as a fully active target for the neutrino interactions, is a novel device, with dimensions of ~2x1.8x0.6 m3 and a total mass of about 2 tons. It consists of about 2x106 small scintillator cubes each of 1 cm3. Each cube is covered by a chemical reflector making it optically separated from each other and has three holes in x, y and z directions. The signal readout from each cube is provided by wavelength shifting fibers inserted in these holes and connected to micro-pixel avalanche photodiodes MPPCs. The total number of channels will be ~60,000. We have demonstrated that this detector, providing three 2D projections, has excellent PID, timing and tracking performance, including a $4 \pi$ angular acceptance, especially important for short proton and pion tracks.
The HA-TPC will be used for 3D track reconstruction, momentum measurement and particle identification. These TPCs, with overall dimensions of 2x2x0.8 m3, will be equipped with 32 resistive Micromegas. The thin field cage (3 cm thickness, 4% rad. length) will be realized with laminated panels of Aramid and honeycomb covered with a kapton foil with copper strips. The 34x42 cm2 resistive bulk Micromegas will use a 500 kOhm/square DLC foil to spread the charge over the pad plane, each pad being approximately 1 cm2. The front-end cards, based on the AFTER chip, will be mounted on the back of the Micromegas and parallel to its plane.
The TOF, consisting of cast plastic scintillator readout by MPPC, will reach a time resolution of 150 ps.
In this talk we will report on the design of these detectors, their performance, the results of the test beam and the plan for the construction.

Speaker: Neha Dokania (Stony Brook University)

t2kupgrade_dpf19_dokania.pdf

397 The DUNE near detector

The Deep Underground Neutrino Experiment (DUNE) aims to make precise
measurements of the neutrino oscillation parameters. In particular, the measurement of
CPV in neutrinos requires the systematic uncertainty be within few percent level. In
order to highly constrain the flux, cross section and detector systematics, DUNE near
detector is designed to be a robust system including various complementing sub-systems
utilizing different technologies.
The DUNE near detector is considered to be comprised of a liquid argon TPC system,
which employs the same nuclear target as the far detector, a high pressure gaseous argon
system, which can give us opportunity to look closer to the neutrino interaction with
lower detection threshold and charge separation, and a 3D projection scintillator tracker
spectrometer, which provides a different nuclear target to tune the A-dependent nuclear
model as well as neutron detection and beam monitoring in a magnetic field. In addition,
the DUNE near detector system is considered to be movable to a number of off-axis
positions. By doing so, reliance on the neutrino interaction models can be greatly
reduced.
In this talk, the reasoning and design of the DUNE near detector system will be
presented and various beam tests with different sub-systems will be shown.

Speaker: Guang Yang (Stony Brook University)

DPF2019_DUNEND_gyang.pdf

398 [Cancelled] The ArgonCube Experiment

ArgonCube is an international collaboration for LArTPC Detector R&D, with a focus on the technical needs for the DUNE physics program. The ArgonCube R&D program is currently aimed on detector modularization, pixelated charge readout, and innovative light detection for large LArTPCs. Modularization addresses a number of technical issues for large LArTPCs, including drift field stability, stored energy, and liquid argon purity. Pixelated readout has proven to deliver true 3D imaging of particle interactions, removing the ambiguities present for existing readout techniques. New approaches to light detection enable increased photon yields and provide improved localization of scintillation signals. The ArgonCube design has been adopted as the baseline LAr system for the DUNE Near Detector. The ArgonCube 2x2 Demonstrator, a 3-ton-active modular pixelated LArTPC, will serve as an engineering prototype for DUNE and is currently under construction and will operate in the Fermilab NuMI neutrino beam in 2020. This talk will give an overview of recent advances in research and a look forward to the upcoming 2x2 demonstrator run.

Speaker: Jonathan Asaadi (University of Texas at Arlington (US))

399 The 3DST Spectrometer as part of the DUNE Near Detector

The main purpose of the Deep Underground Neutrino Experiment (DUNE) is to observe the CP-violation in neutrinos, proton decay and supernova neutrinos with a liquid-argon far detector of unprecedented size.

In the near detector complex, a spectrometer system called 3DST-S centered by a 3D
projection scintillator tracker (3DST) is proposed and being studied. The 3DST-S system is located downstream of a liquid-argon TPC and a high pressure gaseous-argon TPC in a magnetic field. The 3DST-S system consists of 3DST, surrounded by a normal pressure gas TPC, a ECAL and a dipole magnet. The 3DST-S provides comprehensive measurements on a fully active scintillator target allowing constraints on the A-dependence of neutrino interaction models and beam monitoring. In addition, with the capability of neutron detection and energy measurements, full reconstruction of neutrino interaction event would be possible, which in turn provides new ways to analyze the events. For example, the interactions on H can be isolated from the interactions on CH, and these can be utilized to disentangle the degeneracy of the neutrino flux and cross section model.

The 3DST detector consists of a large 3D array of 1 cm x 1 cm x 1cm scintillator cubes. This tracker has a full solid angle coverage ability for charged particles, as well as precise energy and angular measurements, with which, the neutrino-electron scattering channel can be fully utilized in order to do the flux constraint. Besides, 3DST gives an unique opportunity to connect carbon target cross section measurements in DUNE to those in other experiments, such as T2K, NOvA and Minerva. In this talk, the simulation studies and test beam performances of the 3DST-S system will be presented.

Speaker: Guang Yang (Stony Brook University)

DPF2019_DUNE3DST_gyang.pdf

400 High-Pressure Gaseous Argon TPC for the DUNE Near Detector

The DUNE Near Detector design consists of multiple components, each designed to produce complimentary constraints on the flux and neutrino interaction systematic uncertainties for the oscillation analysis. One of these subdetectors is a magnetized high-pressure gaseous-argon TPC (HPgTPC), which will provide fine-grained tracking in a low-density detector, using the same target nucleus as the DUNE far detector. With its low detection threshold, the HPgTPC will be able to constrain one of the most crucial -- and least-well understood — uncertainties for the oscillation analysis: nuclear effects in neutrino-argon interactions. This talk will describe the current design, physics goals, and projected performance of the HPgTPC, as well as the ongoing R&D work at Fermilab, in which a test-stand TPC is being built and will be operated at up to 10 atm pressure.

Speaker: Dr Kirsty Duffy (for the DUNE Collaboration)

DPF_HPgTPC_KDuffy.pdf

401 Overcoming Neutrino Interaction Mis-modeling with DUNE-PRISM

Overcoming Neutrino Interaction Mis-modeling with DUNE-PRISM

Luke Pickering for the DUNE Collaboration

The expected precision of current long-baseline neutrino oscillation experiments (T2K, NO$\nu$A) will be limited by uncertainties in neutrino interaction models in addition to sample statistics. The interaction uncertainties will also play a significant role in next-generation experiments (DUNE, Hyper-K), which aim to collect much larger samples of oscillated neutrinos. Without significant advancements in neutrino-nucleus interaction modeling, traditional analyses will be susceptible to biased oscillation measurements.

The DUNE-PRISM (Precision Reaction Independent Spectrum Measurement) technique offers a complementary approach to the oscillation analysis methods used by T2K, NO$\nu$A, and MINOS. DUNE-PRISM uses direct extrapolation of near detector data to infer oscillation probabilities with significantly less dependence on the validity of neutrino interaction models. This is achieved by combining multiple near detector measurements, each taken with the detector at a different off beam axis position, in order to sample a variety of neutrino energy spectra.

This talk will introduce DUNE-PRISM and show how the oscillation parameters extracted using this technique are robust to unknown interaction modeling errors.

Speaker: Luke Pickering (Michigan State University)

DPF20190801.pdf

402 Modeling Impurity Concentrations in Liquid Argon Detectors

We present a mathematical model for describing the dynamics of impurity distribution in liquid argon detectors. This model considers the full dynamic components with significant influence on the purity performance of a liquid argon detector, including sources, sinks, and transport of impurities within and between the gas and liquid phases of a liquid argon detector. This model was applied on a detector with about 20 liter liquid argon working volume, which was equipped with a purification system only circulating and cleaning argon in itself gas phase, to extract the Henry's coefficient of various impurities. Through ?fitting the time dependence of impurity concentration in liquid argon with the model, the Henry's coe?fficient for oxygen is extracted to be 0.91 $\pm$ 0.03, which is in good agreement with previous measurements. The Henry's coefficient for water, which is previously unknown, can be determined by the similar method. The preliminary result for Henry’s coefficient for water is presented. We further consider a large liquid argon detector with baff?es installed in the gas phase with large coverage on the liquid surface to improve the purity performance. The advantages of this con?figuration in limiting impurity concentrations in the liquid argon are illustrated through this model.

Speaker: Yichen Li (Brookhaven National Laboratory)

DPF2019.pdf

Particle Detectors

parallel sessions

Conveners: Bjoern Penning (Brandeis University), Brian James Rebel (University of Wisconsin-Madison), Guillermo Fernandez Moroni, Jeremy Mans (University of Minnesota (US))

403 Gas Mixture Longevity Studies for the CMS Cathode Strip Chambers in Preparation of HL-LHC

The muon system of the CMS experiment includes 540 Cathode Strip Chambers (CSCs) that serve as the primary source for muon detection and triggering in the endcap region. The CSCs are intended to operate throughout the lifetime of the CMS experiment, including the challenging environment of the HL-LHC era. To access the longevity of the CSCs over the HL-LHC lifespan, a recent campaign of accelerated irradiation studies has been performed at the CERN GIF++ facility. Following, additional irradiation tests of both standard and prototype CSCs with a reduced concentration of CF4 in the gas mixture were also conducted, as part of CERN’s intention to minimize greenhouse gas consumption. Introductory studies with a CF4 substitute of lower global warming potential, the hydrofluoroolefine HFO-1234ze, are also being conducted, in the interest of assessing its impact on chamber performance and longevity.

We present the results of the CSC longevity studies, as well as an introduction to a possible CF4-alternative gas mixture for use in the CSCs.

Speaker: Mr Andrew Wisecarver (Northeastern University (US))

20190801-DPF2019-ALW-final.pdf

404 Role of the CMS electromagnetic calorimeter in the measurement of Higgs boson properties at LHC Run 2 and projections for the HL-LHC with the CMS Phase-2 detector

The characterization of the properties of the Higgs boson relies on the precise determination of its mass, width, and couplings. The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) at the Large Hadron Collider (LHC) plays a crucial role in such a task: maintaining and improving the excellent performance achieved in Run 1 is fundamental for measurements in the highest-resolution channels H->gamma gamma and H->ZZ->4 leptons. The energy reconstruction algorithms and clustering techniques, developed to maintain the excellent performance of the CMS ECAL throughout Run 2, are presented. The high-luminosity phase of the LHC (HL-LHC) is expected to deliver an integrated luminosity of up to 3000 fb^{-1}. The large number of events expected will allow even more precise measurements of the Higgs boson properties, given that the expected overall statistical, experimental, and theoretical uncertainties are comparable in size. However, the very high instantaneous luminosity will lead to about 200 overlapping proton-proton collisions per bunch crossing ("pileup"). To cope with this extremely challenging experimental environment, an upgrade of the ECAL is foreseen. With the upgrade, ECAL will provide a timing precision of about 30 ps that will guarantee substantially improved pileup mitigation and event reconstruction. The improvements to CMS physics analyses provided by this upgrade, as well as prospects for Higgs self-coupling measurements and HH production at the HL-LHC, are presented.

Speaker: Neil Raymond Schroeder (University of Minnesota (US))

dpf2019_ecal_talk_final.pdf

405 Optimizing the performance of the CMS ECAL trigger for Runs 2 and 3 of the CERN LHC

On behalf of the CMS Collaboration:

The CMS Electromagnetic Calorimeter (ECAL) is a high resolution crystal calorimeter operating at the CERN LHC. It is responsible for the identification and precise reconstruction of electrons and photons in CMS, which were crucial in the discovery and subsequent characterization of the Higgs boson. It also contributes to the reconstruction of tau leptons, jets, and calorimeter energy sums, which are are vital components of many CMS physics analyses.

The ECAL trigger system employs fast digital signal processing algorithms to precisely measure the energy and timing information of ECAL energy deposits recorded during LHC collisions. These trigger primitives are transmitted to the Level-1 trigger system at the LHC collisions rate of 40 MHz. These energy deposits are then combined with information from other CMS sub-detectors to determine whether the event should trigger the readout of the data from CMS to permanent storage.

This presentation will summarize the ECAL trigger performance achieved during LHC Run 2 (2015-2018). It will describe the methods that are used to provide frequent calibrations of the ECAL trigger primitives during LHC operation. These are needed to account for radiation-induced changes in crystal and photodetector response, and to minimize the spurious triggering on direct signals in the photodetectors used in the barrel region (|eta|<1.48). Both of these effects are increased relative to LHC Run 1 (2009-2012), due to the higher luminosities experienced in Run 2.

Further improvements in the energy and time reconstruction of the CMS ECAL trigger primitives are being explored for LHC Run 3 (2021-23), using additional features implemented in the on-detector readout. These are particularly focused on improving the performance at the highest instantaneous luminosities (which will reach or exceed 2x10^34 cm-2 s-1 in Run 3) and in the most forward regions of the calorimeter (|eta|>2.5), where the effects of detector aging will be the greatest. The main features of these improved algorithms will be described and preliminary estimates of the potential performance gains will be given.

Speaker: Abraham Tishelman Charny (Northeastern University (US))

DPF_ECAL_Run2_Run3.pdf

406 The CMS ECAL Laser Monitoring system: study of crystal transparency loss and proposed upgrade for the High-Luminosity LHC

The Electromagnetic Calorimeter (ECAL), one of the main subsystems of the CMS detector, measures the energies of electrons and photons. The ECAL is made of 75848 lead tungstate (PbWO_4) crystals. The transparency of crystals is affected by irradiation and the laser monitoring system is designed to measure the transparency changes for each ECAL crystal over time. The aging of the light distribution system under irradiation is also taken into account. In the future, the High-Luminosity LHC upgrade will increase the integrated luminosity of the LHC, providing a much larger dataset for physics to the LHC experiments. This upgrade will lead to higher radiation damage in all the components of the CMS detector. The mitigation of aging is an important goal for the upgrade of the laser light monitoring system. In this talk we report crystal transparency results based on Run 2 data, and we describe the proposed upgrade for the light distribution system.

Speaker: Bruno Lenzi (Université Paris-Saclay (FR))

BL_DPF2019_CMS_ECAL_lasermonitoring.pdf

407 ILD for the International Linear Collider

The International Large Detector (ILD) is a detector concept for the International Linear Collider (ILC), a high-luminosity linear electron-positron collider with an initial center-of-mass energy of 250 GeV (extendable to 1 TeV). The ILD is optimized with the concept of particle flow for overall event reconstruction so that it will deliver excellent performance for high-precision Higgs and top measurements, as well as high-sensitivities for possible new phenomena, utilizing the advantages of an electron-positron collider. Particle flow implies that all particles in an event, charged and neutral, are individually reconstructed. This requirement has a large impact on the design of the detector, and has played a central role in the optimisation of the system. Superb tracking capabilities and outstanding detection of secondary vertices are other important aspects. The overall layout, sub-detector technologies, expected performance, and recent progress of the ILD will be presented.

Speaker: Jean-Claude Brient (Centre National de la Recherche Scientifique (FR))

ILD for ILC JC Brient.pdf

ILD for ILC JC Brient.pptx

408 CMS High Granularity Calorimeter for High Luminosity LHC

The High Luminosity LHC (HL-LHC) will integrate about 10 times more luminosity than the LHC, posing significant challenges for radiation tolerance and event pileup on detectors, especially for forward calorimetry. As part of its HL-LHC upgrade program, the CMS collaboration is designing a High Granularity Calorimeter (HGCAL) to replace the existing endcap calorimeters. It features unprecedented transverse and longitudinal segmentation for both electromagnetic (CE-E) and hadronic (CE-H) compartments to facilitate particle-flow calorimetry. The fine structure of showers can be measured and used to enhance pileup rejection and particle identification, whilst achieving good energy resolution. The CE-E and a large fraction of CE-H will use Silicon sensors as active detector material. The lower-radiation environment will be instrumented with scintillator tiles with on-tile SiPM readout. The Silicon sensors will be of hexagonal shape, maximizing the available 8-inch circular wafer area. An overview of the HGCAL project is presented, summarizing motivation, the main engineering design choices and the R&D program.

Speaker: Maral Alyari (Fermi National Accelerator Lab. (US))

HGCal_DPF_08012019.pdf

Top Quark Physics

parallel sessions

Conveners: Louise Skinnari (Northeastern University (US)), Nikolaos Kidonakis (Kennesaw State University), Reinhard Schwienhorst (Michigan State University (US))

409 Top quark pair production: window into polarized gluon distributions

Top-antitop pairs are produced prolifically in p+p collisions at the LHC, primarily by gluon fusion. At intermediate values of momentum fraction x for each gluon in g+g to t+tbar, the spin dependences of gluon distributions leave imprints on the momentum and spin correlations of the top pairs. These correlations are distinguishable from the quark-antiquark annihilation mechanism. Decays of such spin entangled top pairs through dilepton, single lepton and pure jet channels produce a variety of correlations among pairs of the 3-momenta of the decay products - particles and jets. These different angular correlations will be presented and related to measurable distributions of pairs of jets and/or leptons. Some models for spin dependent gluon transverse momentum distributions and generalized transverse momentum distributions will be used to simulate top pair decay product spin correlations, illustrating how to measure the gluon or quark polarizations in the colliding protons.

Speaker: Dr Gary Goldstein (Tufts University)

Goldstein_APS_DPF_july2019b.pdf

Goldstein_APS_DPF_july2019b.pptx

410 Precision measurement of the top quark spin correlations at CMS

Talk covers the new result by CMS on the measurement of the full spin density production matrix, which includes measurements of variables sensitive to the top quark spin correlation, polarization and other angular observables. Employs events containing two leptons produced in proton-proton collisions at a center-of-mass energy of 13 TeV. Uses data corresponding to an integrated luminosity of 36/fb to challenge the Standard Model predictions and also to set most stringent limits on chromo-magnetic dipole moments of the top quark.

Speaker: Jason Robert Thieman (Purdue University (US))

APSTopSpinCorrelations.pdf

411 Measurement of top quark decay width in the dilepton channel from pp collisions at 13 TeV with CMS data

We present a direct measurement of the top quark decay width with events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data were taken by the CMS detector in 2016, corresponding to an integrated luminosity of 35.9 fb-1. The measurement is performed using the dilepton final state of the ttbar system which are selected containing two charged leptons and at least two jets, with at least one jet being identified as coming from a b quark. The distribution of the invariant mass of the lepton-b jet pairs is reconstructed in different categories depending on the multiplicity of b-jets and on the transverse momentum of the pairs. The distributions are compared to different hypothesis of the width and mass of the top quark which have been simulated at next-to-leading order QCD. A combined profile likelihood fit is used to extract both parameters simultaneously. After profiling the top quark mass we expect to measure the width with a 30% relative uncertainty.

Speaker: Wenyu Zhang (Brown University (US))

present_topwidth_DPF_wenyu_Jul29.pdf

412 Soft-gluon corrections for single top quark production in association with electroweak bosons

We present results for higher order soft-gluon radiative corrections for single top quark production in association with electroweak bosons, including t gamma and t Z production via anomalous FCNC couplings. We provide results for the total cross sections and differential distributions at LHC energies and beyond. We use K-factors to show the significance of the corrections compared to leading order and discuss uncertainties and the importance of the results.

Speaker: Matthew Forslund (Kennesaw State University)

talk.pdf

413 Complete measurement of the top-quark polarisation in t-channel single top-quark production with ATLAS detector

At the LHC, electroweak production of single top quarks in the $t$-channel
leads, in the standard model, to a high degree of top quark polarization.
Two subprocesses, $u b \rightarrow d t$ and $\bar{d} b \rightarrow \bar{u} t$
contribute to $t$-channel production of single top, while charge-conjugate
processes contribute to production of antitop. A high degree of top quark
polarization along the direction of the scattered light-quark (or
"spectator" quark) is expected for top production, and opposite to that
direction for antitop production. This analysis extracts the polarization
of samples of top and antitop quarks produced within a fiducial region of
acceptance, using an integrated luminosity 80.52 fb$^{-1}$ of proton-proton
collisions at 13 TeV, collected with the ATLAS detector. From the angular
distribution of top quark decay products, we obtain all three components of
the polarization of both top quarks and top antiquarks.

Speaker: Runyu Bi (University of Pittsburgh (US))

DPF2019_Top_Polarization.pdf

DPF2019_Top_Polarization_v2.pdf

414 Search for single top quark production in association with a photon in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS experiment at the LHC

Measuring the cross-section of single top quark production in association with a photon ($tq\gamma$) is an important test for the Standard Model. However, this process has not been observed yet. It is sensitive to the top quark charge and its interactions with $W^{\pm}$ bosons and photons. In this talk, I will present the status of ATLAS experiment's search for $tq\gamma$ production using 149 fb$^{-1}$ of pp collision data collected in the LHC Run-2 data taking period at $\sqrt{s}$ = 13 TeV.

Speaker: Harish Potti (University of Texas at Austin (US))

Harish_DPF_tqGamma.pdf

Social Program: Reception & Poster Session

During the Tuesday Banquet at the MFA, we will recognize the 2018 APS Fellowship recipients.

Friday, 2 August

Plenary Sessions: Friday Morning 1

Convener: Prisca Cushman (University of Minnesota)

415 Diversity & Inclusion

Speaker: Prof. Sarah Tuttle (University of Washington)

DPS_Summer2019.pdf

416 Applications of Detector Technology

Speaker: Andrew White (University of Texas at Arlington (US))

Appilcations_of_Detector_Technology_AW.pdf

417 Advanced Accelerator Concepts

Speaker: Dr Mark Palmer (BNL)

DPF2019_Plenary_Palmer_2019_0802_R4.pptx

418 Conference Photo

on steps in front of Blackman Auditorium

Speakers: Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

10:30 Coffee Break

Plenary Sessions: Friday Morning 2

Convener: Bo Jayatilaka (Fermi National Accelerator Lab. (US))

419 Computing for Future HEP Analysis

Speaker: Dr James Amundson (Fermilab)

amundson-computing-analysis.pdf

420 DPF Instrumentation Award: "Resistive Plate Chambers: the planar geometry impact in the world of gaseous detectors"

Speakers: Rinaldo Santonico (Universita e INFN Roma Tor Vergata (IT)), Rinaldo Santonico (INFN e Universita Roma Tor Vergata (IT))

Talk at DPF award.pdf

421 DPF Instrumentation Early Career Award: "Counting electrons with the Skipper-CCD"

The Skipper Charge-Coupled Device (CCD) is a groundbreaking technology that is opening unprecedented windows to the universe through the detection of single photons and electrons. The first gram-scale instrument using the Skipper-CCD technology was produced in 2016 at the Fermi National Accelerator Laboratory in collaboration with the Lawrence Berkeley MicroSystems Lab. This prototype system was able, for the first time, to unambiguously and reliably detect single electrons over millions of pixels reaching the theoretical limit of silicon ionization sensors. In this talk I'll introduce the Skipper-CCD and discuss immediate applications and prospects for the technology.

Speaker: Javier Tiffenberg (Fermilab)

dpf_instrumentation_eca.pdf

422 Introduction to Mentoring Award

Speaker: Roxanne Guenette (Harvard University)

423 DPF Mentoring Award

Speaker: Bonnie Fleming (Yale University)

DPFMentoringAward_Fleming.pdf

424 Closing Remarks

Speakers: Emanuela Barberis (Northeastern University (US)), Toyoko Orimoto (Northeastern University (US))

Closing_remarks_reduced.pdf