SENSEI: Direct-Detection Constraints on Sub-GeV Dark Matter from a Shallow Underground Run Using a Prototype Skipper CCD

Abramoff, Orr (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) ; Barak, Liron (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) ; Bloch, Itay M. (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) ; Chaplinsky, Luke (C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794, USA) (Department of Physics and Astronomy, Stony Brook University, Stony Brook University, Stony Brook, New York 11794, USA) ; Crisler, Michael (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) ; Dawa (C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794, USA) (Department of Physics and Astronomy, Stony Brook University, Stony Brook University, Stony Brook, New York 11794, USA) ; Drlica-Wagner, Alex (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) ; Essig, Rouven (C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794, USA) ; Estrada, Juan (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) ; Etzion, Erez (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) ; Fernandez, Guillermo (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) ; Gift, Daniel (C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, New York 11794, USA) (Department of Physics and Astronomy, Stony Brook University, Stony Brook University, Stony Brook, New York 11794, USA) ; Sofo-Haro, Miguel (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) (Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Universidad Nacional de Cuyo (UNCUYO), Argentina) ; Taenzer, Joseph (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) ; Tiffenberg, Javier (Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA) ; Volansky, Tomer (Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel) (School of Natural Sciences, The Institute for Advanced Study, Princeton, New Jersey 08540, USA) ; Yu, Tien-Tien (Department of Physics and Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403, USA)

24 April 2019

Abstract: We present new direct-detection constraints on eV-to-GeV dark matter interacting with electrons using a prototype detector of the Sub-Electron-Noise Skipper-CCD Experimental Instrument. The results are based on data taken in the MINOS cavern at the Fermi National Accelerator Laboratory. We focus on data obtained with two distinct readout strategies. For the first strategy, we read out the Skipper CCD continuously, accumulating an exposure of 0.177 g day. While we observe no events containing three or more electrons, we find a large one- and two-electron background event rate, which we attribute to spurious events induced by the amplifier in the Skipper-CCD readout stage. For the second strategy, we take five sets of data in which we switch off all amplifiers while exposing the Skipper CCD for 120 ks, and then read out the data through the best prototype amplifier. We find a one-electron event rate of (3.51±0.10)×103 events/pixel/day, which is almost 2 orders of magnitude lower than the one-electron event rate observed in the continuous-readout data, and a two-electron event rate of (3.180.55+0.86)×105 events/pixel/day. We again observe no events containing three or more electrons, for an exposure of 0.069 g day. We use these data to derive world-leading constraints on dark matter-electron scattering for masses between 500 keV and 5 MeV, and on dark-photon dark matter being absorbed by electrons for a range of masses below 12.4 eV.


Published in: Physical Review Letters 122 (2019)
Published by: APS
DOI: 10.1103/PhysRevLett.122.161801
arXiv: 1901.10478
License: CC-BY-4.0



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