Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session C13: Status and Future of Dark Matter Experiments at the 1-10+ GeV ScaleLive
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Sponsoring Units: DPF Chair: Bjoern Penning, Brandeis University Room: Maryland C |
Saturday, April 18, 2020 1:30PM - 1:42PM Live |
C13.00001: SuperCDMS IMPACT: an Ionization Yield Calibration Program Ziqing Hong The SuperCDMS collaboration has developed cryogenic silicon and germanium detectors optimized for phonon signals from dark matter-nucleus collisions. The detectors are sensitive to dark matter masses between about 1 and 10 GeV/$c^2$, which corresponds to sub-keV energy deposits from the nuclear recoil. The sensitivity of a SuperCDMS detector is achieved by applying a high voltage across the crystal. Under the electric field, the signal from electron-hole pairs generated by nuclear recoil events is amplified through the Neganov-Trofimov-Luke (NTL) effect. However, the yield of electron-hole pairs, which is critical to reconstruct the energy of the recoiling nucleus, is not well characterized in the sub-keV nuclear recoil energy region. I will describe a neutron scattering experiment called IMPACT (Ionization Measurement with Phonons At Cryogenic Temperatures), which is designed to measure the ionization yield in SuperCDMS style detectors, the first data collection campaign at the Triangle Universities Nuclear Laboratory (TUNL), and the status of the data analysis. [Preview Abstract] |
Saturday, April 18, 2020 1:42PM - 1:54PM Live |
C13.00002: Status of the LZ Experiment Carmen Carmona-Benitez The LUX-ZEPLIN (LZ) collaboration has grown out of these two precursor experiments, with the goal of constructing a next generation dark matter detector at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, using a dual-phase time projection chamber with 7 tonnes of fully active liquid xenon.This experiment aims to achieve unprecedented sensitivity to weakly interacting massive particles (WIMPs) and is projected to reach a WIMP-nucleon spin-independent cross section of about $1.4\times10^{-48}$ cm$^{2}$ for a 40 GeV/c$^{2}$ WIMP mass in a 1000 live-days, pushing its sensitivity close to irreducible neutrino backgrounds. The LZ experiment is well underway, and slated to start operations this year. This talk will present an overview of the LZ detector design and the current status of the experiment. [Preview Abstract] |
Saturday, April 18, 2020 1:54PM - 2:06PM Live |
C13.00003: Status of the CYGNUS Directional Recoil Observatory Project Sven Vahsen A large directional nuclear recoil observatory can be used to observe and distinguish different neutrino sources, to search for dark matter in the presence of irreducible background, including neutrinos, and to demonstrate the cosmological origin of a dark matter signal. With WIMP-nucleon scattering limits approaching the neutrino floor, and coherent neutrino-nucleon scattering firmly experimentally established, there is increased interest in such an observatory. The CYGNUS proto-collaboration aims to deploy an underground network of Time Projection Chambers (TPCs). I will review recent work carried out within CYGNUS, including R{\&}D on new readouts, construction of prototypes, and physics sensitivity studies. [Preview Abstract] |
Saturday, April 18, 2020 2:06PM - 2:18PM Live |
C13.00004: Sexaquark Dark Matter: Overview; constraints on breakup from SNOlab; relic DM density Zihui Wang, Glennys Farrar The conjectured color-spin-flavor singlet bound state of (uuddss) quarks can be a stable and compact particle, the sexaquark (S). Such a particle, formed from QCD plasma in the early universe, explains the observed dark matter abundance if the breakup amplitude of S to two baryons is smaller than a few $10^{-6}$. We show that this small breakup amplitude is compatible with theoretical expectation because the S can be much smaller than baryons and furthermore two baryons have a very strong short-range repulsion. The transition betwen S and two baryon is thus naturally highly suppressed. We moreover obtain observational constraints on the mass of the S and the breakup amplitude based on the stability of deuterons, hypernuclei and S. Related constraints such as SN1987a cooling and neutron star masses are discussed and shown to not be problematic for the SDM scenario. Direct detection, cosmology and astrophysics constraints and other consequences are discussed in session A03. [Preview Abstract] |
Saturday, April 18, 2020 2:18PM - 2:30PM On Demand |
C13.00005: PICO: Current Status and Future Plans Russell Neilson The PICO collaboration employs bubble chambers filled with C$_{\mathrm{3}}$F$_{\mathrm{8}}$ to search for WIMP dark matter at the SNOLAB underground facility. Results from previous bubble chambers PICO-2L and PICO-60 provide the strongest constraints on spin-dependent WIMP-proton coupling. The next generation of PICO experiments includes PICO-40L, which was installed at SNOLAB in 2019, and PICO-500, currently being designed for a projected exposure on the scale of ton-years. This program is projected to improve WIMP-proton scattering sensitivity by an additional two orders of magnitude. I will report on the current status and future plans of these experiments. [Preview Abstract] |
Saturday, April 18, 2020 2:30PM - 2:42PM On Demand |
C13.00006: Results from COSINE-100 Estella Barbosa de Souza COSINE-100 is a NaI(Tl) dark matter direct detection experiment, with the goal of testing DAMA's claim of dark matter detection by looking for an annual modulation signal. It has eight NaI(Tl) crystals, adding to a total of 106 kg, and 2000 liters of an active liquid scintillator veto. Located at the Yangyang Underground Laboratory, South Korea, COSINE-100 has been running since September 2016. We continue to search for an annual modulation signal, now with a 1 keV threshold and a larger data set covering three modulation cycles. I will discuss recent results and the latest status from COSINE-100. [Preview Abstract] |
Saturday, April 18, 2020 2:42PM - 2:54PM On Demand |
C13.00007: Direct Detection and LHC Limits on Effective WIMP Dark Matter Jeffrey Hutchinson, Kara Farnsworth We analyze the current limits on dark matter candidates from the 36 fb$^{\mathrm{-1}}$ jets $+$ missing transverse momentum ATLAS search and various direct detection searches in the context of minimal extensions to the standard model with thermal relic dark matter. These models, we refer to as Effective WIMPs, contain a gauge singlet dark matter particle with cubic renormalizable couplings between quarks and "partner" particles with the same gauge quantum numbers as quarks. Within this framework, we consider six models where the dark matter is a scalar boson, fermion, or vector boson, and may or may not be its own antiparticle. We find significantly stronger collider limits on these models compared to the squark pair production simplified model primarily due to the variation in the coupling constant that we require to the produce the correct relic abundance over all masses. Direct detection limits vary significantly between the models in the Effective WIMP framework but generally complement collider searches by ruling out regions of parameter space where collider searches are less effective. [Preview Abstract] |
Saturday, April 18, 2020 2:54PM - 3:06PM Not Participating |
C13.00008: The XENONnT Dark Matter Search Experiment Elena Aprile, Fei Gao, Knut Mor\aa To date, dark matter has only been observed through its gravitational interaction. A new detector in the XENON family, XENONnT, is being constructed at the INFN Gran Sasso National Laboratory in Italy, featuring a $6$ tonnes of liquid xenon target contained in a larger time projection chamber. The large target mass and approximately 10 times lower background than its predecessor XENON1T, will increase its sensitivity to WIMPs by one order of magnitude with a WIMPs-nucleon cross section down to $2 \times 10^{-48} cm^2$. Although inheriting major infrastructure of XENON1T, new subsystems are needed to ensure the performance of the XENONnT experiment: The cryogenic purification system which enables to purify the xenon through liquid circulation, the cryogenic distillation column to remove radon, as well as the Gd-loaded water Cherenkov neuton veto system. In this talk, the design, construction and physics reach of this sensitive WIMP detector will be presented. [Preview Abstract] |
Saturday, April 18, 2020 3:06PM - 3:18PM Not Participating |
C13.00009: Sensitivity of the XENONnT experiment Knut Dundas Mor\aa The XENONnT experiment is under construction and commissioning at the LNGS underground lab, Italy. It aims to detect dark matter particles scattering on a liquid xenon target, particularly weakly interacting massive particles (WIMPs). The increased fiducial volume, increased self-shielding and new neutron veto subsystem will reduce both extrinsic and intrinsic background rates, reaching $0.04~\mathrm{ev}/\mathrm{ty}$ for the signal-like neutron background. The ultimate aim of the experiment will be to achieve a sensitivity of $2\times 10^{-48}~\mathrm{cm}^2$ at $30~\mathrm{GeV}$. In this talk I will present estimated backgrounds and sensitivities for the benchmark spin-independent and spin-dependent WIMP searches. [Preview Abstract] |
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