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Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T


Baudis, Laura; Brown, Adam; Galloway, Michelle; Kish, A; Manfredini, Alessandro; Peres, R; Reichard, Shayne; Volta, Giovanni; Wulf, J; et al (2019). Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T. Physical Review Letters, 123(24):241803.

Abstract

Direct dark matter detection experiments based on a liquid xenon target are leading the search for darkmatter particles with masses above∼5GeV=c2, but have limited sensitivity to lighter masses because ofthe small momentum transfer in dark matter-nucleus elastic scattering. However, there is an irreduciblecontribution from inelastic processes accompanying the elastic scattering, which leads to the excitation andionization of the recoiling atom (the Migdal effect) or the emission of a bremsstrahlung photon. In thisLetter, we report on a probe of low-mass dark matter with masses down to about85MeV=c2by looking forelectronic recoils induced by the Migdal effect and bremsstrahlung using data from the XENON1Texperiment. Besides the approach of detecting both scintillation and ionization signals, we exploit anapproach that uses ionization signals only, which allows for a lower detection threshold. This analysissignificantly enhances the sensitivity of XENON1T to light dark matter previously beyond its reach

Abstract

Direct dark matter detection experiments based on a liquid xenon target are leading the search for darkmatter particles with masses above∼5GeV=c2, but have limited sensitivity to lighter masses because ofthe small momentum transfer in dark matter-nucleus elastic scattering. However, there is an irreduciblecontribution from inelastic processes accompanying the elastic scattering, which leads to the excitation andionization of the recoiling atom (the Migdal effect) or the emission of a bremsstrahlung photon. In thisLetter, we report on a probe of low-mass dark matter with masses down to about85MeV=c2by looking forelectronic recoils induced by the Migdal effect and bremsstrahlung using data from the XENON1Texperiment. Besides the approach of detecting both scintillation and ionization signals, we exploit anapproach that uses ionization signals only, which allows for a lower detection threshold. This analysissignificantly enhances the sensitivity of XENON1T to light dark matter previously beyond its reach

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:13 December 2019
Deposited On:09 Jan 2020 10:47
Last Modified:29 Jul 2020 12:26
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.123.241803
Project Information:
  • : FunderH2020
  • : Grant ID674896
  • : Project TitleELUSIVES - The Elusives Enterprise: Asymmetries of the Invisible Universe
  • : FunderH2020
  • : Grant ID690575
  • : Project TitleInvisiblesPlus - InvisiblesPlus

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