Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB.

Autor: Aguilar-Arevalo A; Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Amidei D; Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA., Baxter D; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA., Cancelo G; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Vergara BAC; Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Chavarria AE; Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA., D'Olivo JC; Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Estrada J; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Favela-Perez F; Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Gaïor R; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Guardincerri Y; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Hoppe EW; Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA., Hossbach TW; Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA., Kilminster B; Universität Zürich Physik Institut, Zurich 8057, Switzerland., Lawson I; SNOLAB, Lively, Ontario P3Y 1N2, Canada., Lee SJ; Universität Zürich Physik Institut, Zurich 8057, Switzerland., Letessier-Selvon A; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Matalon A; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA.; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Mitra P; Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA., Overman CT; Pacific Northwest National Laboratory (PNNL), Richland, Washington 99354, USA., Piers A; Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA., Privitera P; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA.; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Ramanathan K; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA., Da Rocha J; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Sarkis Y; Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Settimo M; SUBATECH, CNRS-IN2P3, IMT Atlantique, Université de Nantes, Nantes 44300, France., Smida R; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA., Thomas R; Kavli Institute for Cosmological Physics and The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA., Tiffenberg J; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Traina M; Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Université, Université de Paris, CNRS-IN2P3, 75005 Paris, France., Vilar R; Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain., Virto AL; Instituto de Física de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander 39005, Spain.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2020 Dec 11; Vol. 125 (24), pp. 241803.
DOI: 10.1103/PhysRevLett.125.241803
Abstrakt: We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200  eV_{ee} in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50  eV_{ee}. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σ_{χ-n} as low as 3×10^{-41}  cm^{2} for WIMPs with masses m_{χ} from 7 to 10  GeV c^{-2}. These results are the strongest constraints from a silicon target on the existence of WIMPs with m_{χ}<9  GeV c^{-2} and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.
Databáze: MEDLINE