Explaining the XENON1T Excess with Luminous Dark Matter
AuthorBell, NF; Dent, JB; Dutta, B; Ghosh, S; Kumar, J; Newstead, JL
Source TitlePhysical Review Letters
PublisherAMER PHYSICAL SOC
University of Melbourne Author/sBell, Nicole
AffiliationSchool of Physics
Document TypeJournal Article
CitationsBell, N. F., Dent, J. B., Dutta, B., Ghosh, S., Kumar, J. & Newstead, J. L. (2020). Explaining the XENON1T Excess with Luminous Dark Matter. PHYSICAL REVIEW LETTERS, 125 (16), https://doi.org/10.1103/PhysRevLett.125.161803.
Access StatusOpen Access
We show that the excess in electron recoil events seen by the XENON1T experiment can be explained by a relatively low-mass luminous dark matter candidate. The dark matter scatters inelastically in the detector (or the surrounding rock) to produce a heavier dark state with a ∼2–3keV mass splitting. This heavier state then decays within the detector, producing a peak in the electron recoil spectrum that is a good fit to the observed excess. We comment on the ability of future direct detection experiments to differentiate this model from other “beyond the standard model” scenarios and from possible tritium backgrounds, including the use of diurnal modulation, multichannel signals, etc., as possible distinguishing features of this scenario.
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