Self-interacting inelastic dark matter in the light of XENON1T excess

Dutta, Manoranjan and Mahapatra, Satyabrata and Borah, Debasish and Sahu, Narendra (2021) Self-interacting inelastic dark matter in the light of XENON1T excess. Physical Review D, 103 (9). pp. 1-17. ISSN 2470-0010

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We propose a self-interacting inelastic dark matter (DM) scenario as a possible origin of the recently reported excess of electron recoil events by the XENON1T experiment. Two quasidegenerate Majorana fermion DM particles interact within themselves via a light hidden sector massive gauge boson and with the standard model particles via gauge kinetic mixing. We also consider an additional long-lived singlet scalar, which helps in realizing correct dark matter relic abundance via a hybrid setup comprising both freeze-in and freeze-out mechanisms. While being consistent with the required DM phenomenology along with sufficient self-interactions to address the small-scale issues of cold dark matter, the model with GeV-scale DM can explain the XENON1T excess via inelastic down-scattering of the heavier DM component into the lighter one. All these requirements leave a very tiny parameter space, keeping the model very predictive for near-future experiments. © 2021 authors.

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Additional Information: D. B. acknowledges the support from Early Career Research Award from DST-SERB, Government of India (Grant No. ECR/2017/001873). M. D. acknowledges Department of Science and Technology (DST), Government of India, for providing the financial assistance for the research under Grant No. DST/INSPIRE/03/2017/000032. M. D. would also like to acknowledge Tracy R. Slatyer and Katelin Schutz for useful discussion regarding self-interating dark matter.
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 24 Sep 2022 10:55
Last Modified: 24 Sep 2022 10:55
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