Exothermic Dark Matter

Graham, Peter W.; Harnik, Roni; Rajendran, Surjeet; Saraswat, Prashant

doi:10.1103/PhysRevD.82.063512

Exothermic Dark Matter

Journal Article · Thu Apr 01 04:00:00 EDT 2010 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.82.063512· OSTI ID:2520550

^[1]; ^[2]; ^[3]; Saraswat, Prashant ^[1]

Stanford U., Phys. Dept.
Fermilab
MIT, LNS

We propose a novel mechanism for dark matter to explain the observed annual modulation signal at DAMA/LIBRA which avoids existing constraints from every other dark matter direct detection experiment including CRESST, CDMS, and XENON10. The dark matter consists of at least two light states with mass ~few GeV and splittings ~5 keV. It is natural for the heavier states to be cosmologically long-lived and to make up an O(1) fraction of the dark matter. Direct detection rates are dominated by the exothermic reactions in which an excited dark matter state down-scatters off of a nucleus, becoming a lower energy state. In contrast to (endothermic) inelastic dark matter, the most sensitive experiments for exothermic dark matter are those with light nuclei and low threshold energies. Interestingly, this model can also naturally account for the observed low-energy events at CoGeNT. The only significant constraint on the model arises from the DAMA/LIBRA unmodulated spectrum but it can be tested in the near future by a low-threshold analysis of CDMS-Si and possibly other experiments including CRESST, COUPP, and XENON100.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

DOE Contract Number:: 89243024CSC000002

OSTI ID:: 2520550

Report Number(s):: FERMILAB-PUB-10-062-T; MIT-CTP-4140; SU-ITP-10-15; arXiv:1004.0937; oai:inspirehep.net:850946

Journal Information:: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 82

Country of Publication:: United States

Language:: English

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