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

Jul 29, 2019, 8:00 AM → Aug 2, 2019, 5:00 PM 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

Mon, July 29

8:25 AM → 10:30 AM Plenary Sessions: Monday Morning 1

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

8:30 AM Welcome from Northeastern College of Science

Speaker: Prof. Michael Pollastri (Northeastern University)

Opening_BarberisOrimoto.pdf

8:35 AM Welcome from APS

Speaker: Dr Kate Kirby (APS)

8:40 AM Welcome from DPF

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

DPFWelcome.pdf

8:50 AM Flavor: Theory

Speaker: Dean Robinson (UC Santa Cruz/ LBL)

dpf_flavor19.pdf

9:15 AM Flavor: Rare Decays & Tests of Lepton Flavor

Speaker: Saurabh Sandilya (University of Cincinnati)

2019SandilyaDPF.pdf

9:40 AM Flavor: CPV

Speaker: Sheldon Stone (Syracuse University (US))

Flavor-CPV-2019.pdf

10:05 AM Flavor: Violation & Dipole Moments

Speaker: Jason Crnkovic (Brookhaven National Laboratory)

jdcrnkovic-dpf-2019.pdf

10:30 AM → 11:00 AM Coffee Break

11:00 AM → 12:30 PM Plenary Sessions: Monday Morning 2

Convener: Tao Han (University of Pittsburgh)

11:00 AM String Theory

Speaker: Gary Shiu

APS_2019.pdf

11:20 AM Lattice QCD

Speaker: Andreas Kronfeld (Fermilab)

ask4dpf.pdf

11:40 AM Heavy Ions

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

atimminsDPF.pdf

12:10 PM Education & Outreach

Speaker: kathryn jepsen (Stanford University)

DPF_KJepsen_plenary.pdf

DPF_KJepsen_plenary.pptx

12:45 PM → 1:45 PM DPF Executive Committee: Meeting (CLOSED)

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

2:00 PM → 3:32 PM 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)

2:00 PM 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

2:15 PM 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

2:30 PM 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

2:45 PM 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

3:02 PM 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

3:17 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:00 PM → 3:30 PM Dark Matter

parallel sessions

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

2:00 PM 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

2:17 PM 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

2:34 PM 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

2:51 PM 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

3:08 PM 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

2:00 PM → 3:30 PM Field & String Theory

parallel sessions

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

2:00 PM 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

2:20 PM 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

2:40 PM 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

2:00 PM → 3:40 PM Neutrino Physics

parallel sessions

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

2:00 PM 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

2:20 PM 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

2:40 PM 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

3:00 PM 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

3:20 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:18 PM 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

2:36 PM 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

2:54 PM 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

3:12 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:20 PM 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

2:40 PM 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

2:00 PM → 3:30 PM 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)

2:00 PM Probing Hidden Sectors with Flavor

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

Speaker: Jared Evans

FlavorsHiddenSectors.pdf

2:20 PM 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

2:40 PM 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

3:00 PM 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

3:30 PM → 4:00 PM Coffee Break

4:00 PM → 6:00 PM 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)

4:00 PM 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

4:17 PM 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

4:34 PM 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

4:51 PM 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

5:08 PM 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

4:00 PM → 6:00 PM 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))

4:00 PM 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

4:00 PM → 6:00 PM DOE: Energy Frontier

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

4:00 PM DOE Energy Frontier Overview

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

DPF-Meeting_2019_PI-Meeting-EnergyFrontier-FINAL4.pdf

4:00 PM → 6:00 PM Dark Matter

parallel sessions

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

4:00 PM 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

4:17 PM 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

4:34 PM 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

4:51 PM 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

5:08 PM 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

5:25 PM 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

5:42 PM 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

4:00 PM → 6:00 PM Field & String Theory

parallel sessions

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

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

4:00 PM → 6:00 PM Neutrino Physics

parallel sessions

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

4:00 PM 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

4:15 PM 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

4:30 PM 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

4:45 PM 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

5:00 PM 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

5:20 PM 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

4:00 PM → 6:00 PM 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))

4:00 PM 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

4:18 PM 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

4:36 PM 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

4:54 PM 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

5:09 PM 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

5:26 PM 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

5:42 PM 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

4:00 PM → 6:00 PM 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))

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

5:20 PM 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

4:00 PM → 6:00 PM 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)

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

5:20 PM 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

5:40 PM 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

6:30 PM → 8:30 PM DOE: DOE PI Meeting: Budget/Early Career/Cross-cut topics

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

6:30 PM Communicating Science with Impact

Speaker: Allison Eckhardt

2019-07-29 Communicating Science with Impact.pdf

acknowledgement one pager.pdf

6:50 PM DOE PI Meeting

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

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

Tue, July 30

8:30 AM → 10:30 AM Plenary Sessions: Tuesday Morning 1

Convener: Rafael Lang

8:30 AM Axion DM Searches

Speaker: Lindley Winslow (Massachusetts Institute of Technology)

Conference_Winslow_DPF2019.pdf

8:50 AM Models of Dark Matter & Dark Sectors

Speaker: Natalia Toro (SLAC)

Toro DPF 2019 DM theory.pdf

9:10 AM 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

9:40 AM Dark Matter: Indirect Detection

Speaker: Kerstin Perez (MIT)

KPerez_APSDPF_20190830.pdf

10:05 AM Dark Matter: Astrophysical Probes

Speaker: Alex Drlica-Wagner (Fermilab)

ADW-DM-DPF2019.pdf

10:30 AM → 11:00 AM Coffee Break

11:00 AM → 12:30 PM Plenary Sessions: Tuesday Morning 2

Convener: Marcelle Soares-Santos (Brandeis University)

11:00 AM New Measurements of Cosmological Parameters

Speaker: Jonathan Blazek (EPFL/OSU)

Blazek Cosmology DPF 2019

Blazek_cosmology_DPF2019.key

Blazek_cosmology_DPF2019.pdf

11:30 AM Astrophysical Evidence on Heavy & Light Dark Species

Speaker: Annika Peter (Ohio State University)

dpf2019_peter.pptx

12:00 PM High Energy Astroparticles

Speaker: Tyce DeYoung (Michigan State University)

DeYoung_DPF_2019.pdf

12:20 PM DPF2019 Tues Remarks

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

Day2_remarks_v2.pdf

12:45 PM → 1:45 PM Lunch Time Sessions: Education & Outreach: Communications Workshop

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

2:00 PM → 3:30 PM 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)

2:00 PM 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

2:18 PM 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

2:36 PM 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

2:54 PM 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

3:12 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:20 PM 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

2:40 PM 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

3:00 PM 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

2:00 PM → 3:30 PM Cosmology & Dark Energy

parallel sessions

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

2:00 PM 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

2:18 PM 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

2:36 PM 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

2:54 PM 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

3:12 PM 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

2:00 PM → 3:30 PM DOE: HEP Theory

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

2:00 PM DOE HEP Theory Overview

Speaker: William Kilgore (Department of Physics)

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

2:00 PM → 3:30 PM Dark Matter

parallel sessions

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

2:00 PM 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)

2:17 PM 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

2:34 PM 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

2:51 PM 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

3:08 PM 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

2:00 PM → 3:30 PM Education & Outreach

parallel sessions

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

2:00 PM 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

2:18 PM 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

2:36 PM 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

2:54 PM 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

3:12 PM 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

2:00 PM → 3:32 PM 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)

2:00 PM 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

2:23 PM 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

2:45 PM 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

3:08 PM 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

2:00 PM → 3:30 PM Neutrino Physics

parallel sessions

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

2:00 PM 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

2:20 PM 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

2:35 PM 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

2:50 PM 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

3:05 PM 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

2:00 PM → 3:35 PM 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))

2:00 PM 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

2:15 PM 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

2:30 PM 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

2:45 PM 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

3:00 PM 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

3:15 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:20 PM Multi-jet cross section measurements at the LHC

Speaker: Christine Angela McLean (SUNY Buffalo)

DPF2019_MultijetMeasurements_McLean.pdf

2:40 PM 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

2:00 PM → 3:30 PM 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)

2:00 PM 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

2:20 PM 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

2:40 PM 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

3:00 PM 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

3:30 PM → 4:00 PM Coffee Break

4:00 PM → 6:00 PM 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))

4:00 PM 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

4:17 PM 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

4:34 PM 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

4:51 PM 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

5:08 PM 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

5:25 PM 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

5:42 PM 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

4:00 PM → 6:00 PM Cosmology & Dark Energy

parallel sessions

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

4:00 PM 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

4:30 PM 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

5:00 PM 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

5:30 PM 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

4:00 PM → 6:00 PM DOE: Cosmic Frontier

Conveners: Eric Linder (Berkeley Lab), Kathy Turner

4:00 PM DOE Cosmic Frontier Overview

Speaker: Eric Linder (Berkeley Lab)

HEP-PI-Cosmic 2019final.pdf

4:00 PM → 6:00 PM Dark Matter

parallel sessions

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

4:00 PM 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

4:17 PM 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

4:34 PM 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

4:51 PM 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

5:08 PM 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

5:25 PM 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

5:42 PM 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

4:00 PM → 6:00 PM Education & Outreach

parallel sessions

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

4:00 PM 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

4:18 PM 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

4:36 PM 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

4:54 PM 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

5:12 PM 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)

5:30 PM 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)

4:00 PM → 6:00 PM 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)

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

5:20 PM 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

5:40 PM "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

4:00 PM → 6:00 PM Neutrino Physics

parallel sessions

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

4:00 PM 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

4:15 PM 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

4:30 PM 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

4:45 PM 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

5:00 PM 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

5:15 PM 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

5:30 PM 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

5:45 PM 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

4:00 PM → 6:00 PM 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))

4:17 PM 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

4:35 PM 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

4:52 PM 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

5:10 PM 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

5:27 PM 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

5:43 PM 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

4:00 PM → 6:00 PM 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))

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

5:20 PM 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

5:40 PM 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

4:00 PM → 6:00 PM 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)

4:00 PM 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

4:20 PM 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

4:40 PM 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

5:00 PM 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

5:20 PM 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)

5:40 PM 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

6:30 PM → 9:30 PM Social Program: Conference Banquet

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

Wed, July 31

8:30 AM → 10:30 AM Plenary Sessions: Wednesday Morning 1

Convener: Darien Wood (Northeastern University (US))

8:30 AM Precision Electroweak, Top, and Higgs at LHC

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

KetiKaadze_DPF2019.pdf

9:00 AM What don't we know about the Higgs boson?

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

Low_DPF2019.pdf

9:20 AM Frontiers of Perturbative QCD

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

petriello-DPF2019.pdf

9:40 AM LHC Results on BSM

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

swiatlow_lhc_bsm_final_builds.pdf

swiatlow_lhc_bsm_final_nobuilds.pdf

10:10 AM Theory Perspectives on Particle Searches at LHC

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

DPF_AMartin_2019.pdf

10:30 AM → 11:00 AM Coffee Break

11:00 AM → 12:32 PM Plenary Sessions: Wednesday Morning 2

Convener: Kate Scholberg (Duke University)

11:00 AM Neutrino Theory: What are the important questions?

Speaker: Irina Mocioiu (Pennsylvania State University)

mocioiu_dpf_19.pdf

11:20 AM Long-baseline Accelerator Neutrinos

Speaker: Louise Suter (Fermi National Accelerator Laboratory)

DPF_LBL_Suter.pdf

11:40 AM Short-baseline Neutrinos

Speaker: Roxanne Guenette (Harvard University)

DPF_SBL_Guenette.pdf

12:10 PM Neutrinoless Double-beta Decay & Direct Mass Measurements

Speaker: Yury Kolomensky (UC Berkeley/LBNL)

09_Wed_DBD_NuMass_DPF2019_Kolomensky.pdf

12:30 PM DPF2019 Wed Remarks

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

Day3_remarks.pdf

12:45 PM → 1:45 PM Lunch Time Sessions: Career Panel Discussion

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

12:45 PM Career Panel Discussion: Meet the Panelists

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

dpf2019careerpanel.pdf

2:00 PM → 3:30 PM Astroparticles & CMB

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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:18 PM 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

2:36 PM 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

2:54 PM 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

3:12 PM 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

2:00 PM → 3:30 PM 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))

2:00 PM 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

2:20 PM 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

2:40 PM 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

3:00 PM 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

2:00 PM → 3:30 PM DOE: Detector R&D

Convener: Helmut Marsiske (Unknown)

2:00 PM DOE Detector R&D Overview

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

DPF2019_DetectorR&D_31jul2019.pdf

2:00 PM → 3:30 PM 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)

2:00 PM → 3:30 PM Dark Matter

parallel sessions

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

2:00 PM 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

2:17 PM 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

2:34 PM 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

2:51 PM 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

3:08 PM 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

2:00 PM → 3:30 PM 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)

2:00 PM 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

2:23 PM 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

2:45 PM 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

3:08 PM 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