Direct detection of exothermic dark matter with light mediator

Geng, Chao-Qiang (Chongqing University of Posts & Telecommunications, Chongqing, 400065, China) (Department of Physics, National Tsing Hua University, Hsinchu, Taiwan) (Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan) ; Huang, Da (Department of Physics, National Tsing Hua University, Hsinchu, Taiwan) ; Lee, Chun-Hao (Department of Physics, National Tsing Hua University, Hsinchu, Taiwan) ; Wang, Qing (Department of Physics, Tsinghua University, Beijing, 100084, China) (Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China)

05 August 2016

Abstract: We study the dark matter (DM) direct detection for the models with the effects of the isospin-violating couplings, exothermic scatterings, and/or the lightness of the mediator, proposed to relax the tension between the CDMS-Si signals and null experiments. In the light of the new updates of the LUX and CDMSlite data, we find that many of the previous proposals are now ruled out, including the Ge-phobic exothermic DM model and the Xe-phobic DM one with a light mediator. We also examine the exothermic DM models with a light mediator but without the isospin violation, and we are unable to identify any available parameter space that could simultaneously satisfy all the experiments. The only models that can partially relax the inconsistencies are the Xe-phobic exothermic DM models with or without a light mediator. But even in this case, a large portion of the CDMS-Si regions of interest has been constrained by the LUX and SuperCDMS data.

Published in: JCAP 1608 (2016) 009
Published by: Institute of Physics Publishing/SISSA
DOI: 10.1088/1475-7516/2016/08/009
arXiv: 1605.05098
License: CC-BY-3.0

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