Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session D12: Dark Matter III |
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Sponsoring Units: DPF Chair: Priscilla Cushman, University of Minnesota Room: Marquette III - 2nd Floor |
Saturday, April 15, 2023 3:45PM - 3:57PM |
D12.00001: Status and prospects of the electron recoil channel in XENONnT Yue Ma XENONnT recently published the first search results with low-energy electron-recoil data. Compared with XENON1T, the liquid xenon target is increased by ~4 and the background rate in the region of interest is reduced by a factor of 5. With an exposure of 1.16 tonne-years, we observe no excess above background and set stringent new limits on solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter. The ultra-low O(10keV) electron recoil background also demonstrates the possibility for XENONnT to contribute to other topics like solar neutrino measurement in the near future. |
Saturday, April 15, 2023 3:57PM - 4:09PM |
D12.00002: The XENONnT Dark Matter Experiment Shenyang Shi The main goal of the XENONnT detector is the direct detection of Weakly Interacting Massive Particles (WIMPs), aiming to improve the sensitivity by one order of magnitude than XENON1T. The WIMP data analysis using the first science run with a total exposure of more than 1 tonne*year has been completed in 2022. More data is being accumulated in 2023. In this talk, I will give an overview of the XENONnT experiment as well as its first WIMP search result. |
Saturday, April 15, 2023 4:09PM - 4:21PM |
D12.00003: Flow based Po218-BiPo214 parent-child tagging in LUX-ZEPLIN as validation of Pb214 tagging methods Jacob J McLaughlin LUX-ZEPLIN (LZ) has the furthest physics reach of any xenon time projection chamber (TPC) dark matter detector built to date, however Rn-222 chain Pb-214 decays still present the largest background contribution to any low energy search. While LZ provides excellent discrimination against electron recoil (ER) backgrounds, like those produced by Pb-214 decays, additional mitigation methods can further reduce Pb-214 backgrounds to help LZ achieve its ultimate WIMP sensitivity. One such mitigation could be exploitation of spatial correlations between a particular Po-218 decay and its child Pb-214, separated by O(10) minute xenon flows. Convective flow in previous TPC experiments have made this method untenable, but this talk will demonstrate successful parent-child tagging of Po-218 and Bi-Po-214 pairs separated by up to 80 minutes. The potential reduction in Pb-214 rate achieved when applying this technique to a non-signal region in LZ's SR1 dataset will also be presented. |
Saturday, April 15, 2023 4:21PM - 4:33PM |
D12.00004: Dark Matter Searches at Coherent CAPTAIN-Mills Mayank Tripathi Coherent CAPTAIN-Mills(CCM) experiment is a 10 ton Liquid Argon scintillation detector experiment located at the Los Alamos National Laboratory(LANL). The Los Alamos Neutron Science Center(LANSCE) provides an 800 MeV proton beam on a tungsten target which is a copious source of neutrinos from stopped pions, as well as, possibly, new particles belonging to Dark Sector of particle physics with masses in the range of keV to MeV. This sub-GeV Dark Matter then coherently scatters off the Ar nuclei to produces scintillation light. The CCM detector is equipped with photomultiplier tubes(PMTs) to capture the scintillation light. A prototype detector instrumented with 120 PMTs, CCM120 operated between 2018 and 2019, demonstrating the potential of such a detector for the search of Sub-GeV dark matter. CCM's first engineering run has already achieved sensitivity to previously unexplored parameter space of light dark matter (LDM) models with a baryonic vector portal. The upgraded CCM200 detector, with 200 PMTs, improved shielding and LAr filtration and purification system is now taking beam data. In this talk the status of the experiment, as well as results from CCM120 and expected sensitivity to new physics of CCM200 will be presented. |
Saturday, April 15, 2023 4:33PM - 4:45PM |
D12.00005: Ionization and Scintillation from Argon Electron Recoils Aaron M Elersich The Aron Recoil Ionization and Scintillation (ARIS) Experiment measured the response of LAr to neutrons of a known energy. The response of LAr to low-energy interactions is still poorly understood, and the proposed Argon Recoil Ionization and Scintillation from Electron Recoils (ARIS-ER) experiment will characterize the LAr response to electron recoils down to a keV. The LAr in the ARIS-ER time projection chamber will be exposed to 511 keV gammas from a Na-22 source, which Compton scatter inside the detector. The energy of the scattered gammas will be measured by a Broad Energy Germanium (BEGe) detector and will determine the energy deposited. This information will be used to refine a GEANT-4 model describing ionization and scintillation processes in LAr, and will be useful for LAr-based dark matter searches. This talk will provide an overview of the ARIS-ER experiment's progress. |
Saturday, April 15, 2023 4:45PM - 4:57PM |
D12.00006: Sub-GeV dark matter searches with SENSEI Sho Uemura, Prakruth Adari, Yonatan Ben Gal, Itay M Bloch, Mariano Cababie, Gustavo Cancelo, Fernando Chierchie, Rouven Essig, Juan Estrada, Erez Etzion, Guillermo Fernandez Moroni, Yaron Korn, Aviv Orly, Dario Rodriguez, Nathan Saffold, Aman Singal, Miguel Sofo Haro, Leandro Stefanazzi, Javier S Tiffenberg, Liron Barak, Kelly Stifter, Tomer Volansky, Tien-Tien Yu, Ana Martina Botti SENSEI (Sub-Electron Noise Skipper Experimental Instrument) is a direct detection dark matter experiment with detectors operating at Fermilab and at the SNOLAB underground facility. The experiment consists of silicon Skipper-CCD sensors that make multiple non-destructive measurements of the charge contained in each of millions of pixels, reducing the readout noise to a level that allows for resolution of single electrons. This low energy threshold, along with low rates of events with one, two, three, and four electrons, results in competitive sensitivity for low-mass dark matter candidates that interact with electrons over a wide range of dark matter masses. In this talk we present an overview of the SENSEI experiment, as well as the current status after the successful commissioning of the first batch of science-grade sensors at SNOLAB. |
Saturday, April 15, 2023 4:57PM - 5:09PM |
D12.00007: Current Status of Scintillating Bubble Chambers For Dark Matter Detection Zhiheng Sheng The Scintillating Bubble Chamber (SBC) Collaboration aims to search for dark matter via low-energy nuclear recoils with strong electron recoil discrimination at a target threshold of 100 eV. We combine the excellent electron recoil discrimination by bubble chamber technology with the event-by-event energy resolution offered by liquid argon scintillation for possible detection of 1–10 GeV/c2 WIMPs. Two functionally identical 10 kg detectors, SBC-Fermilab and SBC-SNOLAB are being developed. SBC-Fermilab is currently being assembled and commissioned at Fermi National Accelerator Laboratory for calibration of nuclear and electron recoil responses. SBC-SNOLAB is planned with an emphasis on radiopurity for low-background dark matter search and will be deployed deep underground at SNOLAB. If a background event rate of 0.1 ev/kg/yr is achieved, SBC-SNOLAB will be capable of competitive sensitivity of 2·10-43–10-44 cm2, for a WIMP mass of 1–10 GeV/c2 with 10 kg-yr exposure. We are exploring multiple background mitigation methods, including using scintillation in our hydraulic fluid CF4 as a veto against neutrons and neutron producing interactions. In this talk, I will present the current progress on the SBC-Fermilab chamber, and characterization of scintillation in liquid CF4 by gamma and alpha particles for background reduction. |
Saturday, April 15, 2023 5:09PM - 5:21PM |
D12.00008: The Light Dark Matter eXperiment, LDMX Joseph Muse 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 ?xed-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. |
Saturday, April 15, 2023 5:21PM - 5:33PM |
D12.00009: Visible Signatures in LDMX Tyler G Horoho 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 to within about an MeV to 100 TeV. Most of the stable constituents of known matter have masses in the lower range, and a thermal origin for dark matter works in a simple and predictive manner in this mass range as well. The Light Dark Matter eXperiment (LDMX) is a planned electron beam fixed-target experiment at SLAC that will probe a variety of dark matter models in the sub-GeV mass range using a missing momentum technique. Although optimized for this technique, LDMX is effectively a fully instrumented beam dump experiment, making it possible to search for visibly decaying signatures. This would provide another outlet for LDMX to probe complementary regions of dark matter phase space for a variety of models, provided that the additional technical challenges can be met. This contribution will give an overview of the motivations for LDMX and focus on the technical challenges of searches for visible signatures at LDMX. |
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