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Search for Light Dark Matter Interactions Enhanced by the Migdal Effect or Bremsstrahlung in XENON1T
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 1342019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 24, article id 241803Article in journal (Refereed) Published
Abstract [en]

Direct dark matter detection experiments based on a liquid xenon target are leading the search for dark matter particles with masses above similar to 5 GeV/c(2), but have limited sensitivity to lighter masses because of the small momentum transfer in dark matter-nucleus elastic scattering. However, there is an irreducible contribution from inelastic processes accompanying the elastic scattering, which leads to the excitation and ionization of the recoiling atom (the Migdal effect) or the emission of a bremsstrahlung photon. In this Letter, we report on a probe of low-mass dark matter with masses down to about 85 MeV/c(2) by looking for electronic recoils induced by the Migdal effect and bremsstrahlung using data from the XENON1T experiment. Besides the approach of detecting both scintillation and ionization signals, we exploit an approach that uses ionization signals only, which allows for a lower detection threshold. This analysis significantly enhances the sensitivity of XENON1T to light dark matter previously beyond its reach.

Place, publisher, year, edition, pages
2019. Vol. 123, no 24, article id 241803
Keywords [en]
Dark matter, Particle dark matter
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-177446DOI: 10.1103/PhysRevLett.123.241803ISI: 000502798200004OAI: oai:DiVA.org:su-177446DiVA, id: diva2:1385904
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-15Bibliographically approved

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Aalbers, JelleAntochi, Vasile C.Barge, DerekBauermeister, BorisConrad, Jan M.Ferella, Alfredo D.Lindner, M.Mahlstedt, JörnMorå, KnutPelssers, Bart
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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