Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session K18: Dark Matter with Neutrino Experiments and Other TechniquesLive
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Sponsoring Units: DPF Chair: Yun-Tse Tsai, SLAC |
Sunday, April 18, 2021 1:30PM - 1:42PM Live |
K18.00001: Search for low mass dark matter at ICARUS detector using the NuMI beam Nicholas Suarez, Animesh Chatterjee, Vittorio Paolone The proposed Short-Baseline Neutrino physics program at Fermilab will deliver rich and compelling physics opportunities, including the ability to resolve a class of experimental anomalies in neutrino physics. The ICARUS-T600 detector which functions as the far detector of the SBN program is being commissioned at FNAL. In addition to its main physics program (sterile neutrino search), thanks to the superb performance of the detector, ICARUS can provide an excellent opportunity to study dark matter. Because ICARUS is situated approximately 5.7 degrees off of the NuMI neutrino beam, where the low mass dark matter (LDM) flux is expected to peak for a wide range of masses while the neutrino flux is greatly reduced, LDM searches would greatly benefit. In this talk, we will discuss the opportunity to search for LDM at ICARUS using the NuMI neutrino beam. [Preview Abstract] |
Sunday, April 18, 2021 1:42PM - 1:54PM Live |
K18.00002: Search for Light Dark Matter at the ICARUS T-600 Detector with the NuMI Beam: Status of Simulation Studies. Hector Carranza, Jaehoon Yu, Angela Fava, Wooyoung Jang, Pedro Machado, Kevin Kelly The ICARUS T-600 detector is a Liquid Argon Time Projection Chamber (LArTPC) that is capable of 3D reconstruction of particle tracks with a O(1 mm) resolution and particle energy reconstruction with a threshold of 200 MeV inside the active volume. It is presently installed on the surface at Fermilab as part of the Short Baseline Neutrino Program, exposed on-axis to the Booster Neutrino Beam (BNB) and 6 degrees off axis to the Neutrinos from the Main Injector (NuMI) beam. As theoretical studies on light dark matter (LDM) resulting from mesons coming from beam-target experiments show, there is a maximum LDM to neutrino background ratio at around 6 degrees off-axis. Experimental studies of LDM resulting from the processes pion$^{\mathrm{0}}$(eta$^{\mathrm{0}})$ to photon $+$ dark photon to photon $+$ DM pair \begin{figure}[htbp] \centerline{\includegraphics[width=1.44in,height=0.17in]{080120211.eps}} \label{fig1} \end{figure} at the ICARUS detector are highly favored. Here I will present the expected sensitivities for such searches for various LDM parameter sets on the process DM $+$ electron to DM $+$ electron, using a full simulation chain, consisting of a custom DM flux generator, GENIE's LDM-e$^{\mathrm{-}}$ interaction simulator, and ICARUS's LArSoft detector simulation code. [Preview Abstract] |
Sunday, April 18, 2021 1:54PM - 2:06PM Live |
K18.00003: Status of DEAP-3600 at SNOLAB Sumanta Pal DEAP-3600 is a low-background, single-phase liquid argon (LAr) direct detection experiment looking for nuclear recoils from WIMP dark matter, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3279 kg of LAr contained in a spherical acrylic vessel. LAr is an excellent scintillator, transparent to its own scintillation light. Photomultiplier tubes detect the scintillation light, and pulse shape discrimination is applied to differentiate between nuclear recoils and electromagnetic interactions (the most abundant backgrounds, which predominantly come from the beta-decay of Ar39). I will present an analysis of a 758 tonne-day exposure during 231 live day data set taken during the first year of operation. I will also discuss the current detector status, ongoing hardware upgrades, plans to improve the alpha-decays background discrimination in the detector neck region, recent updates of LAr scintillation pulse shape analysis, and an update on WIMP-search analysis including an approach using a non-relativistic effective field theory framework considering various possible substructures in the local dark matter halo to interpret the WIMP results.~ [Preview Abstract] |
Sunday, April 18, 2021 2:06PM - 2:18PM Live |
K18.00004: Making the invisible visible: search for dark photons using a dielectric multilayer haloscope Laura Manenti Non-thermal production mechanisms could generate light bosonic dark matter (DM) particles. Such DM candidates, the dark photons (DP), would interact with the standard model (SM) matter via absorption and emission of SM photons. Dielectric haloscopes consist of thin dielectric layers with alternating high and low refractive indices and can convert DP into SM photons, thus making the invisible visible. At NYUAD we are developing a SiO$_{2}$/Si$_{3}$N$_{4}$ dielectric haloscope coupled with a single-photon detector for the detection of 1.5 eV dark photons. We optimise the dielectric stack so that the DP-SM photon conversion is maximum around 1.5 eV and explored different stack configurations to enable conversion over a wider range of masses around 1.5 eV. We obtained an upper limit at 90\% confidence level and a discovery limit at 5-sigma on the dark photon-SM photon kinetic mixing parameter under different estimates of background rates. In the first prototype experimental setup, we use an avalanche photodiode in Geiger mode as photosensor. In the second stage of the experiment, we employ a transition-edge sensor which is estimated to have $10^{-4}$ Hz dark counts rate. I will present the results from our statistical and numerical analyses, along with the experimental findings. [Preview Abstract] |
Sunday, April 18, 2021 2:18PM - 2:30PM Live |
K18.00005: Measurement of Compton scattering on silicon atomic shell electrons with Skipper CCDs Julian Cuevas-Zepeda, Danielle Norcini, Paolo Privitera For direct detection searches, reaching detector energy thresholds $\mathcal{O}(10\,eV)$ is necessary for sensitivity to low-mass dark matter candidates. In this regime, ionization signals from small-angle Compton scattering of environmental $\gamma$-rays need to be calibrated for proper background estimatation in silicon-based detectors, such as DAMIC-M. Using $^{241}$Am and $^{57}$Co $\gamma$-ray sources, we report the first measurements of scattering on silicon atomic shell electrons in a Skipper charged-coupled device (CCD) with single-electron resolution. Agreement between data and a theoretically-motivated parameterization of the spectral features will be discussed. [Preview Abstract] |
Sunday, April 18, 2021 2:30PM - 2:42PM Live |
K18.00006: Cosmogenic Activation of Dark Matter Silicon Detectors Ryan Thomas A major source of background in next-generation silicon based dark matter experiments (such as DAMIC-M, SENSEI, and SuperCDMS) is cosmogenic activation of the silicon detector material, especially generation of tritium. Tritium is relatively long lived (compared to the time scale of dark matter experiments), and decays through a low energy beta decay, creating a significant irreducible background for silicon-based searches of low mass WIMPs or other low energy dark matter candidates. Despite this, the sea-level cosmogenic activation rate of tritium in silicon has been poorly understood, due to the relatively low saturation rate and low energy nature of the decay, which makes measuring the tritium naturally produced through cosmogenic processes extremely difficult. An alternative method is to expose silicon to a neutron beam that closely mimics the cosmic ray neutron spectrum, which produces a high enough rate to perform a direct counting measurement. We present the results of such an experiment using CCDs and wafers, and the resulting measurement of the cosmogenic activation rates for $^{3}$H, $^{22}$Na, and $^{7}$Be in silicon. [Preview Abstract] |
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