Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session E10: Mini-symposium: Innovative Dark Matter Detection IMini-Symposium Recordings Available
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Sponsoring Units: DPF Chair: Robert Bernstein, Fermilab Room: Salon 3 |
Saturday, April 9, 2022 3:45PM - 4:21PM |
E10.00001: Searching for Dark Matter with Proton Beams at High Intensities and High Energies Invited Speaker: Brian Batell Theories of light sub-GeV dark matter and dark sectors are well-motivated and are being pursued on a variety of experimental fronts. Experiments utilizing intense and energetic proton beams play a crucial role in this effort. In this talk, I will discuss the exciting opportunities to search for dark matter at both proton fixed target experiments, such as those used to study neutrino oscillations, as well as proposed experiments in the far forward region at the Large Hadron Collider. |
Saturday, April 9, 2022 4:21PM - 4:33PM |
E10.00002: Searching for light dark sectors at Fermilab's proton-fixed target experiment: DarkQuest Nhan Tran, William P McCormack Accelerator-based searches for dark matter provide a unique opportunity to expand the search for particle dark matter to the sub-GeV mass regime. In this region, there are exiting opportunities to search for dark sector signatures, mediators and the dark matter itself, that are unconstrained. DarkQuest is a proton fixed-target experiment that would use a high-intensity beam of 120 GeV protons to produce dark sector mediators. These mediators will interact feebly with the SM and decay into visible states with displaced lepton, photon and hadron decay signals. DarkQuest will exploit the short baseline and compact spectrometer of the current beam dump experiment at Fermilab, SpinQuest, to search for these decays. Because it builds on existing accelerator and detector infrastructure, it offers a powerful yet low-cost experimental initiative that can be realized on a short timescale. In this talk we will discuss the current detector design, proposed upgrades and recent studies on the signal topology and the detector acceptance. |
Saturday, April 9, 2022 4:33PM - 4:45PM |
E10.00003: Search for Dark Matter Produced in Association with a Dark Higgs Boson Decaying to two b-quarks Using full Run-2 data set from the ATLAS detector Qibin Liu A hypothetical dark Higgs boson was proposed in a dark matter (DM) model to explain the origin of mass in dark sector as well as to open up a new annihilation channel relaxing the DM relic density constraint from cosmological observation. The search focusing on Majorana DM produced with a low mass dark Higgs boson decaying to two b-quarks is proposed and working in progress using the 139 fb-1 of proton-proton collision data collected with the ATLAS detector at √s=13 TeV. |
Saturday, April 9, 2022 4:45PM - 4:57PM |
E10.00004: A Dark Matter WIMP That Can Be Detected and Definitively Identified with Currently Planned Experiments Roland E Allen We propose and describe a dark matter particle which is consistent with current experiment and observation, and which should be detectable within the next 1-5 years. This particle is unique in that it has (i) precisely defined couplings and (ii) a well-defined mass of about 72 GeV. It has not yet been detected because it has no interactions other than second-order gauge couplings, to W and Z bosons. However, these weak couplings are still sufficient to enable observation by direct detection experiments which should be fully functional within the next few years, including XENONnT, LZ, and PandaX. The cross-section for collider detection at LHC energies is small (roughly 1 fb) but observation may ultimately be achievable at the high-luminosity LHC, and should certainly be within reach of the even more powerful colliders now being planned. It is possible that the present dark matter candidate has already been observed via indirect detection: Several analyses of gamma rays from the Galactic center, observed by Fermi-LAT, and of antiprotons, observed by AMS-02, have shown consistency with the interpretation that these result from annihilation of dark matter particles having roughly the same mass and annihilation cross-section as the present candidate. Finally, there is consistency with the observations of Planck, which have ruled out many possible candidates with larger masses. The most promising signature for collider detection appears to be missing transverse energy of > 145 GeV accompanied by two jets, following creation through vector boson fusion. The most promising mechanism for direct detection appears to be a one-loop process involving exchange of two vector bosons. The present dark matter particle and the lightest susy neutralino (as well as an axion-like particle) can stably coexist in a multicomponent dark matter scenario. |
Saturday, April 9, 2022 4:57PM - 5:09PM |
E10.00005: Probing Invisible Vector Meson Decays with NA64 and LDMX Kevin Zhou, Philip Schuster, Natalia Toro Electron beam fixed target experiments such as NA64 and LDMX use missing energy-momentum to detect the production of dark matter and other long-lived states. The most studied production mechanism is dark Bremsstrahlung through a vector mediator. In this work, we explore a complementary source of missing energy-momentum signals: Bremsstrahlung photons can convert to hard vector mesons in exclusive photoproduction processes, which then decay to dark matter or other invisible particles, such as neutrinos. We find that existing NA64 data can improve the leading constraints on invisible light vector meson decays, while a future run of LDMX could improve them by up to 5 orders of magnitude. For the examples of a dark photon and a U(1)B gauge boson mediator, accounting for meson decays substantially enhances these experiments' sensitivity, especially to thermal relic dark matter of mass above 0.1 GeV. |
Saturday, April 9, 2022 5:09PM - 5:21PM |
E10.00006: Search for dark matter-electron scatters with DarkSide-50 David-Michael Poehlmann The DarkSide-50 experiment uses a two-phase argon time projection chamber to directly search for dark matter interactions. The energy threshold of the detector can be lowered by including ionization-only events. While background rejection is lost, DarkSide-50's sensitivity is expanded to sub-GeV dark-matter candidates. I will present DarkSide-50's updated search for WIMP-electron scatters with a larger exposure coupled with improved calibrations, modeling, and analysis. |
Saturday, April 9, 2022 5:21PM - 5:33PM |
E10.00007: LDMX Trigger Scintillator system Niramay V Gogate, Lene Bryngemark New theoretical developments have motivated “hidden sector” dark matter with mass below the proton mass. The Light Dark Matter Experiment (LDMX) will use an electron beam to produce dark matter in fixed-target collisions. A low current, high repetition rate (37.2MHz) electron beam extracted from SLAC’s LCLS-II will provide LDMX with sufficient luminosity to explore many dark matter candidates. Using a novel detector design, LDMX is expected to definitively search for thermal relic dark matter with masses between 1 MeV and several hundred MeV. |
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