The Mitchell Conference on Collider, Dark Matter, and Neutrino Physics 2019
In association with the Physics Department at Sam Houston State University, the 2019 Mitchell Conference on Collider, Dark Matter, and Neutrino Physics will be held on May 15-17 at the George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University. The conference will focus on recent developments in the fields of collider, dark matter, and neutrino physics. The conference will be attended by experimental and theoretical experts from these fields, and plenty of time will be allocated for interaction, discussion, and collaboration.
Venue
Texas A&M University, College Station, Texas
Mitchell Institute (MIST), Hawking Auditorium
Internet Access
Guest internet instructions will be provided with your welcome packet. Some guests have had connectivity issues in the past, so we highly recommend that you setup Eduroam if your home institution supports it. The setup requires internet connection, so it needs to be done before hand. Once done it will allow you hassle-free internet access at more than 400 academic institutions around the US. Please contact your IT support for assistance.
Organizers
Mohammad Abdullah
Amanda Barreiro (Admin)
James Dent
Bhaskar Dutta
Teruki Kamon
William Shepherd
Louis Strigari
Joel Walker
Andrew Larkoski
Andrew Long
Arash Azizi
Brandon Melcher
Brooks Thomas
Can Kilic
Devin Aebi
Dibyashree Sengupta
Diego Aristizabal
Diego Aristizabal
Diego Restrepo
Dimitri Nanopoulos
Doojin Kim
Elham Azadbakht
Flip Tanedo
Fredrick Olness
Hannsjorg Weber
Howard Baer
Huaike Guo
Hyunyong Kim
Ilia Gogoladze
Jason Kumar
Jayden Newstead
Jayden Newstead
Jeff Kost
Joel Meyers
Joseph Bramante
Joshua Berger
Joshua Page
juan estrada
Keith Dienes
Kuver Sinha
Lei Zheng
Madison Kriticos
Mario Martone
Mohammad Abdullah
Nicole Bell
Nikolay Kolev
Oliver Stelzer-Chilton
Pedro Fernandez Manteca
Peisi Huang
Roland Allen
Rouzbeh Allahverdi
Scott Watson
Simona Murgia
Sourov Roy
Stefano Passaggio
SUDIP JANA
Surya Kiran Kanumilli
Sven Dildick
Tao Han
Tianjun Li
Tim Tait
William Balunas
Ximo Poveda
Yun-Tse Tsai
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08:00
Check-in + Light Breakfast
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Cosmology: Early Universe
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2
Baryogenesis and an Early Period of QCD ConfinementSpeaker: Tim M.P. Tait (University of California, Irvine)
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3
A phase of confined electroweak force in the early Universe
We consider a modified cosmological history in which the new physics causes the electroweak gauge sector, $SU(2)_L$, to confine before it is Higgsed and before the strong force confines. Eventually, the universe leaves this confining $SU(2)_L$ phase and returns to the phases we know to be present from BBN. In the confining $SU(2)_L$ phase, we argue that the quark and lepton electroweak-doublets form scalar condensates that acquire nonzero expectation values, thereby breaking global symmetries including baryon number and lepton number. The "weak" gauged forces $SU(3)_C \times U(1)_Y$ are broken to an $SU(2)\times U(1)$ subgroup. We discuss the symmetry breaking pattern, spectrum of mesons and composite fermions, and possible implications for early Universe cosmology.
Speaker: Joshua Berger (University of Pittsburgh) -
4
Multistep Strongly First Order Phase Transitions from New Fermions at the TeV Scale
Despite the vast literature on first order Electroweak Phase Transitions (EWPT), which can provide the necessary conditions for generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this talk, we consider a simple fermionic extension of the Standard Model (SM) involving one SU(2)L doublet and two singlet Vector-Like Leptons (VLLs), strongly coupled to the Higgs scalar and with TeV-scale masses. We show how such a simple scenario can give rise to a non-trivial thermal history of the Universe, involving strongly first order multistep phase transitions occurring at temperatures close to the electroweak (EW) scale. Afterwards, we investigate the distinct Gravitational Wave (GW) signatures of these phase transitions at future GW detectors, such as LISA, and briefly discuss the LHC signatures of the VLLs. Finally, we compare the full model GW results with the ones obtained in an Effective Field Theory coming from integrating out the VLLs.
Speaker: Peisi Huang (University of Nebraska-Lincoln)
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2
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10:15
Tea Break
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LHC
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5
Searches for Dark Matter with CMS
Searches for dark matter in various final states with invisible particles recoiling against standard model particles are presented.
The focus of the talk is on the recent CMS results obtained using data collected in the LHC run 2.Speaker: Pedro Fernandez Manteca (Universidad de Cantabria and CSIC (ES)) -
6
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 could be produced at the LHC. The search for dark matter at the LHC can either be performed directly, by looking for a signature of large missing transverse momentum coming from the dark matter candidates escaping the detector, or more indirectly by looking for the intermediate mediators which would couple the dark matter particles to the Standard Model. A broad and systematic search program covering these various possibilities with the ATLAS detector is in place: this talk will review the latest results of these searches and show their complementarity.
Speaker: William Balunas (University of Oxford (GB)) -
7
Searches for Supersymmetric Particles in ATLAS
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarizes recent ATLAS results for searches for supersymmetric (SUSY) particles. Both R-Parity conserving and R-Parity violating SUSY scenarios are considered. The searches used proton-proton collisions at $\sqrt{s}$ = 13 TeV and up to 140/fb of integrated luminosity, and involved final states including jets, missing transverse momentum, and light leptons as well as long-lived particle signatures
Speaker: Stefano Passaggio (INFN e Universita Genova (IT))
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5
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11:55
Lunch Break - on your own
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Session in Honor of Dimitri Nanopoulos' Retirement
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12
Dimitri and the advent of SUSY phenomenology
I cover three issues in SUSY phenomenology that Dimitri
pioneered: superparticle cascade decays, neutralino dark matter
and naturalness in SUSY models.Speaker: Howard Baer (University of Oklahoma)
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15:30
Tea Break and Cake Cutting
Featuring Joel Walker
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Session in Honor of Dimitri Nanopoulos' Retirement
- 13
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14
Kajia YuanSpeaker: Kajia Yuan
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The Minimal Superstring Standard Model (MSSSM) Years and Beyond
This talk is meant as a thank-you for the role and influence that Dimitri played in advancing my physics career. (In particular, the MSSSM papers we produced earned me my faculty position at Baylor University.) After briefly summarizing our MSSSM papers (and the NAHE class of free fermionic heterotic models upon which it was constructed), I briefly review some of the free fermionic NAHE-based and NAHE-extension models my research group explored at Baylor, including our string landscape studies. The dissertation research of ten of my graduate students was based on related research. I also recap how free fermionic landscape model research inspired one my students to start a high-tech business.
Speaker: Gerald Cleaver (Baylor University, Waco, Texas, USA) - 17
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Things I learned from Dimitri NanopoulosSpeaker: Joel Walker (Sam Houston State University)
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19
The λ6 UniverseSpeaker: Dimitri Nanopoulos
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19:00
Reception at The George
Featuring Tianjun Li and John Ellis
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08:00
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08:00
Check-in + Light Breakfast
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Dark Matter: X-rays and Neutron Stars
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20
ALPs: What can we learn from neutron stars and X-ray astronomy?
Axion-like particles (ALPs) produced in the core of a neutron star can convert to photons in the magnetosphere, leading to possible signatures in the soft and hard X-ray emission from these sources. We study these signatures taking the magnetar SGR 1806-20 as an example. In particular, assuming ALP emission rates from the core that are just subdominant to neutrino emission, the parameter space of ALPs can be constrained by the requirement that the luminosity from ALP-to-photon conversion should not exceed the total observed luminosity from the magnetar. Up to astrophysical uncertainties pertaining to the core temperature, these constraints are competitive with constraints from helioscope experiments in the relevant part of ALP parameter space. Another class of signatures in this context are polarized X-rays, since ALPs only mix with the parallel component of the photon. These polarization signals may be observable by IXPE (in the 2-8 keV range) and XPP (in the 15-60 keV range). We comment on ongoing work on photon-dark photon conversions near magnetars.
Speaker: Kuver Sinha -
21
Probing axions with X-ray observations of magnetic white dwarfs
Axions are hypothetical particles that couple extremely weakly to regular matter, which makes them challenging to probe in the laboratory. However, axions should be produced in the dense environments of compact stars, providing an additional cooling channel that leads to well-known constraints on the axion’s couplings to matter. These constraints are indirect, and although compact stars are predicted to “glow” in axions, this radiation is invisible to us. In this talk I will discuss how the axion radiation is converted into X-ray emission in the strong magnetic field that surround many compact stars, thereby providing a new strategy for probing axions through X-ray observations of magnetic white dwarf stars.
Speaker: Andrew Long (University of Michigan - LCTP) -
22
Heating up Neutron Stars with Dark MatterSpeaker: Nicole Bell (University of Melbourne)
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20
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10:15
Tea Break
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Supersymmetry and Naturalness
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23
Gravity safe, electroweak natural axionic solution to strong CP and SUSY $\mu$ problems
Particle physics models with Peccei-Quinn (PQ) symmetry breaking as a consequence of supersymmetry (SUSY) breaking are attractive in that they solve the strong CP problem with a SUSY DFSZ-like axion, link the SUSY breaking and PQ breaking intermediate mass scales and can resolve the SUSY $\mu$ problem with a naturalness-required weak scale $\mu$ term whilst soft SUSY breaking terms inhabit the multi-TeV regime as required by LHC sparticle mass limits and the Higgs mass measurement. In spite of so many advantages these models have a major disadvantage in that global symmetries are incompatible with gravity and hence suffer a generic gravity spoliation problem. We present two models based on the discrete R-symmetry $\mathbf{Z}_{24}^R$-which may emerge from compactification of 10-d Lorentzian spacetime in string theory-where the $\mu$ term and dangerous proton decay and R-parity violating operators are either suppressed or forbidden while a gravity-safe PQ symmetry emerges as an accidental approximate global symmetry leading to a solution to the strong CP problem and a weak-scale/natural value for the $\mu$ term. Though there are many other solutions to the $\mu$ problem, the models based on discrete R-symmetry $\mathbf{Z}_{24}^R$ seem highly motivated. A general consideration of string theory landscape imply a mild statistical draw towards large soft SUSY breaking terms. We can extend this reasoning to the models considered here in which PQ symmetry is broken by a large negative quartic soft term. The pull towards large soft terms also pulls the PQ scale as large as possible. However, this is tempered by the cosmological requirement to avoid overproduction of mixed axion-WIMP dark matter in the early universe. Such requirements lead to an upper bound of $f_a$ $\sim$ $10^{14}$ GeV with a most probable value of $f_a$ $\sim$ $7*10^{11}$ GeV, which is well below the typical expectation that $f_a$ $\sim$ $10^{16}$ GeV from string theory.
Speaker: Dibyashree Sengupta (University of Oklahoma) -
24
Signatures of supersymmetry and $L_\mu - L_\tau$ gauge boson at Belle-II
We propose that the $\gamma + {\not E}$ signal at the Belle-II detector will be a smoking gun for supersymmetry (SUSY) in the presence of a gauged $U(1)_{L_\mu - L_\tau}$ symmetry. A striking consequence of breaking the enhanced symmetry appearing in the limit of degenerate (s)leptons is the non-decoupling of the
radiative contribution of heavy charged sleptons to the $\gamma - Z^\prime$ kinetic mixing. The signal process, $e^+ e^- \rightarrow \gamma Z^\prime \rightarrow \gamma + {\not E}$, is an outcome of this ubiquitous feature. We take into account the severe constraints on gauged $U(1)_{L_\mu - L_\tau}$ models by several low-energy observables and show that any significant excess in all but the highest photon energy bin would be an undeniable signature of such heavy scalar fields in SUSY coupling to $Z^\prime$. The number of signal events depends crucially on the logarithm of the ratio of stau to smuon mass in the presence of SUSY. In addition, the number is also inversely proportional to the $e^+-e^-$ collision energy, making a low-energy, high-luminosity collider like Belle-II an ideal testing ground for this channel. This process can probe large swathes of the slepton mass ratio vs the additional gauge coupling ($g_X$) parameter space. More importantly, it can explore the narrow slice of $M_{Z^{\prime}}-g_X$ parameter space still allowed in gauged $U(1)_{L_\mu - L_\tau}$ models for superheavy sparticles.Speaker: Sourov Roy (IACS, Kolkata) -
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Naturalness vs. stringy naturalness
Douglas introduced the notion of stringy naturalness: the value of an
observable in string theory is more natural if more phenomenologically acceptable
landscape vacua lead to its value versus some other value.
I compare this notion of naturalness to other conventional measures. Stringy
naturalness applied to the electroweak scale seems to imply a Higgs mass
mh~125 GeV with all sparticles currently beyond the reach of LHC Run 2.Speaker: Howard Baer (University of Oklahoma)
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23
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11:55
Lunch Break - on your own
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Dark Matter: Terrestrial Searches
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26
Searching for Boosted Dark Matter via Dark-Strahlung
I discuss an unprecedented search channel for boosted dark matter (BDM) signals coming from the present universe. The signal process is initiated by the scattering of high-energy BDM off an electron/nucleon. If the dark matter (DM) is dark-sector U(1)-charged, the scattered BDM may emit a dark gauge boson (called "dark-strahlung") decaying to a SM fermion pair. In fact, the existence of this channel may allow for the interpretation that the associated signal stems from BDM, not from the DM-origin neutrinos. I argue that despite its subleading nature, the BDM with a large boost factor may induce an O(10-20%) event rate of the lowest-order simple elastic scattering of BDM, in the parameter regions unreachable by typical beam-produced DM. I further claim that the dark-strahlung channel may even outperform the leading-order channel in BDM searches, especially when the latter is plagued by substantial background contamination. Finally, I discuss experimental sensitivities at DUNE far detectors, showing remarkable usefulness of dark-strahlung.
Speaker: Doojin Kim (University of Arizona (US)) -
27
Gas Clouds as Dark Matter Detectors
Cold gas clouds in the Milky Way have the potential to discover dark matter. Sensitivity to dark matter models including strongly-interacting, millicharged, and superheavy dark matter will be presented. The basic logic behind gas cloud bounds on dark matter will also be discussed.
Speaker: Joseph Bramante (Queen's University & Perimeter Institute) -
28
Seeing the Light of Dark Matter
Repurposing large underground detectors to search
for the photon signal of inelastic dark matterSpeaker: Graham Kribs
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26
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14:45
Tea Break
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Dark Matter: Gamma Rays and Gravity Waves
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29
Gamma-Ray Signals From Velocity-Dependent Dark Matter AnnihilationSpeaker: Jason Kumar
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30
Probing Exotic(Dark) Compact Objects with Extreme Mass Ratio Inspirals
Exotic compact objects(ECO) like primordial black holes, boson stars, etc.,
are interesting astrophysical targets and can serve as dark matter candidates. Their existence, however, is still in doubt. In this talk, I will discuss the
possibility of using the gravitational waves from the extreme mass ratio
inspiral(EMRI) as a new way of probing the ECOs and show that future space-based gravitational wave detectors like LISA will be much more powerful at probing these ECOs than LIGO. Possible electromagnetic counterparts of the gravitational wave signals for boson stars will also be briefly introduced.Speaker: Huaike Guo -
31
Gamma-ray observations of M31 and dark matter implications
In this talk I will discuss recent observations of the Andromeda galaxy in gamma rays and implications for dark matter.
Speaker: Prof. Simona Murgia (University of California, Irvine)
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29
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16:25
Tea Break
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Dark Matter: Astrophysics and Cosmology
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32
Astrophysical Aspects of Secretly Asymmetric Dark Matter
I will present the phenomenology of the Secretly Asymmetric Dark Matter (SADM) scenario, where the DM relic abundance is set through an asymmetry generated in multiple DM flavors in the early universe, despite an unbroken and gauged DM number symmetry. There is a massless dark photon associated with the DM number symmetry, and DM flavors with asymmetries of opposite signs can form bound states. The existence of the dark photon as a relativistic degree of freedom, the formation and interaction of the bound states, and the dark acoustic oscillations in the early universe give rise to dynamical effects, which help address astrophysical and cosmological puzzles across a broad range of length scales.
Speaker: Can Kilic (University of Texas at Austin) -
33
Co-Decaying Dark Matter and its Cosmological Signatures
This talk will mostly follow the discussions found in https://arxiv.org/abs/1711.04773 and https://arxiv.org/abs/1902.04082. We will discuss the cosmological implications of the Co-Decaying Dark Matter Model--a recently proposed mechanism for depleting the density of dark matter through the decay of nearly degenerate particles. This model generically predicts the existence of an Early Matter Dominated phase of universe evolution. We will show that this phase promotes sub-structure growth that can survive free-streaming effects to remain as compact micro-halos to the present era. In addition to micro-halos, Co-Decaying Dark Matter can foster an early universe environment conducive to the formation of near solar-mass black holes that can account for an appreciable fraction of the total present-day Dark Matter abundance.
Speaker: Brandon Melcher (Syracuse University) -
34
Dark Matter In and Out of Equilibrium
One generic scenario for the dark matter of our universe is that it resides in a hidden sector: it talks to other dark fields more strongly than it talks to the Standard Model. I'll discuss some simple, WIMP-y models of this kind of hidden sector dark matter, paying particular attention to what we can learn from the cosmic history of the dark sector. In particular, the need to populate the dark sector in the early universe can control the observability of dark matter today. Some results of interest include new cosmological lower bounds on direct detection cross-sections and simple models of dark matter with parametrically novel behavior.
Speaker: Dr Julia Shelton
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32
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18:30
Banquet at the Mitchell Institute
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08:00
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08:00
Check-in + Light Breakfast
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Neutrinos
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35
Confronting Neutrino Mass Generation Mechanism with MiniBooNE Anomaly
We present a novel framework that provides an explanation to the long-standing excess of electron-like events in the MiniBooNE experiment at Fermilab. We suggest a new dark sector containing a dark neutrino and a dark gauge boson, both with masses between a few tens and a few hundreds of MeV. Dark neutrinos are produced via neutrino-nucleus scattering, followed by their decay to the dark gauge boson, which in turn gives rise to electronlike events. This mechanism provides an excellent fit to MiniBooNE energy spectra and angular distributions. We propose here to use this fact to connect the generation of neutrino masses to a light dark sector, charged under a new U(1)D dark gauge symmetry. We introduce the minimal number of dark fields to obtain an anomaly free theory with the spontaneous breaking of the dark symmetry and obtain automatically the inverse seesaw Lagrangian. In addition, the so-called μ-term of the inverse seesaw is dynamically generated and technically natural in this framework.
Speaker: SUDIP JANA (OKLAHOMA STATE UNIVERSITY) -
36
CP violation in coherent elastic neutrino-nucleus scattering experiments
The presence of new neutrino-quark interactions can enhance, deplete or distort the coherent elastic neutrino-nucleus scattering (CEvNS) event rate. The new interactions can involve CP violating phases that can potentially affect these features. Assuming vector light mediators we study the effects of CP violation on the CEvNS process, and for that aim we consider the COHERENT sodium-iodine (NaI), liquid argon (LAr) and germanium detectors. We identify a region in parameter space for which the event rate always involves a dip and another one for which this is never the case. We show that the presence of a dip in the event rate can be used to constraint CP violating effects, in such a way that the larger the detector volume the tighter the constraints. In the region where no dip is present, we find that CP violating parameters can mimic the SM CEvNS prediction or spectra induced by real parameters. Thus, we point out that the interpretation of CEvNS data in terms of new physics should take into account possible CP violating effects.
Speaker: Diego Aristizabal (Universidad Tecnica Federico Santa Maria (USM)) -
37
Radiative Dirac neutrino masses
The realization of the effective operator for generation of genuine radiative Dirac neutrino masses requieres at least one spontaneously symmetry broken extension of the standard model with a singlet scalar. We explore the phenomenology of the minimal realizations of this scenario.
Speaker: Prof. Diego Alejandro Restrepo Quintero
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35
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10:15
Tea Break
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Dark Matter and Cosmology
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38
Constraining Non-thermal Dark Matter by CMB
A period of early matter domination can give rise to the correct dark matter abundance for a broad range of dark matter annihilation rate. I show that obtaining the correct relic abundance for small annihilation rates sets a lower bound on the duration of early matter domination era. On the other hand, the requirement that the scalar spectral index of inflationary fluctuations be within the observationally allowed range limits the duration of this epoch from above. By combining these considerations, I show that data from the cosmic microwave background experiments can tightly constrain the parameter space for this scenario. In particular, models of inflation with a tensor-to-scalar ratio below ${\cal O}(0.01)$ may disfavor non-thermal supersymmetric dark matter from a modulus-driven early matter domination epoch.
Speaker: Rouzbeh Allahverdi -
39
Deciphering the Archaeological Record: Cosmological Imprints of Non-Minimal Dark SectorsSpeaker: Keith Dienes (University of Arizona)
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40
Cosmological Constraints on Unstable Particle EnsemblesSpeaker: Brooks Thomas (Lafayette College)
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38
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41
Acknowledgments and AnnouncementsSpeaker: Mohammad Abdullah (Texas A&M University)
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12:05
Lunch Break - on your own
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LHC
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42
Searches for Heavy Resonances with the ATLAS detectorSpeaker: Oliver Stelzer-Chilton (TRIUMF (CA))
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43
Measurements of the Higgs boson properties at the ATLAS experiment
After the discovery of the Higgs boson in summer 2012, the understanding of its properties has been a high priority of the ATLAS physics program. Measurements of Higgs boson properties sensitive to its production processes, decay modes, kinematics, mass, and spin/CP properties based on pp collision data recorded at 13 TeV are presented. The analyses of several production processes and decay channels will be described, including recent highlights as the direct observation of the couplings to top and beauty quarks, and an updated combination of all measurements.
Speaker: Ximo Poveda Torres (CERN) -
44
Searches for supersymmetry with the CMS experiment in Run-2 data
In this talk, the latest results from the CMS collaboration on searches for supersymmetric particles with the run-2 data are presented. The talk focuses on searches that have analyzed the full run-2 data set collected during the LHC pp collision runs of 2016, 2017, and 2018, as well as new search ideas using only a partial run-2 data set.
Searches for both strong and electroweak produced supersymmetry will be shown
and different search approaches will be discussed.Speaker: Hannsjorg Weber (Fermi National Accelerator Lab. (US))
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42
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14:45
Tea Break
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Dark Matter and Cosmology
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45
Reheating at Strong Coupling
I will discuss challenges for inflationary cosmology, focusing on the need to reheat the Standard Model in the presence of multiple hidden sectors.
Speaker: Scott Watson (Syracuse University) -
46
Establishing the Initial Conditions for Inflation: A Slingshot MechanismSpeaker: Dr Jeff Kost (Institute of Basic Science)
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47
Cosmic-ray dark matter from simplified models
It has been previously noted that cosmic rays propagating in the galaxy can scatter on the dark matter halo. This scattering can impart energy to the dark matter, creating a small population of 'cosmic-ray dark matter' particles. This population of cosmic rays could be observed in ordinary dark matter and neutrino detectors. In this talk I will review the formalism of cosmic-ray dark matter and then describe improvements and extensions that we are making to the formalism. Notably, this includes applying the formalism to simplified models of dark matter, which are more suitable in the regime under consideration (where we have relativistic, strongly interacting dark matter).
Speaker: Dr Jayden Newstead (Arizona state university)
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45
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16:25
Tea Break
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Phenomenology and Model Building
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48
Vector Self-Interacting Dark Matter
We present a model for spin-1 dark matter with self-interactions through a massive spin-1 mediator. Despite all gauge symmetries being broken, the dark matter candidate is stable. We then discuss how this toy model fits into a broader research program of new types of composite dark matter.
Speaker: Flip Tanedo (UC Riverside) -
49
Proton Decay and Sparticle SpectroscopySpeaker: Ilia Gogoladze (University of Delaware)
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50
The Possible Upper Bounds on the Sparticle Masses
We discuss the upper bounds on the sparticles masses.
In the split supersymmetry, we consider such bounds from
the Higgs boson mass and electroweak vacuum stability. And
in the universal high-scale supersymmetry, we consider
such bounds from Higgs boson mass, gauge couple unification,
and proton decay, etc.Speaker: Prof. Tianjun Li (Institute of Theoretical Physics, Chinese Academy of Sciences)
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48
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08:00