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arXiv · 1705.06546

Exothermic Dark Matter with Light Mediator after LUX and PandaX-II in 2016

Chao-Qiang Geng·Da Huang·Chun-Hao Lee
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Abstract

Dark matter (DM) direct detections are investigated for models with the following properties: isospin-violating couplings, exothermic scatterings, and/or a light mediator, with the aim to reduce the tension between the CDMS-Si positive signals and other negative searches. In particular, we focus on the non-standard effective operators which could lead to the spin-independent DM-nucleus scatterings with non-trivial dependences on the transfer momentum or DM velocity. As a result, such effective operator choices have the very mild effects on the final fittings. Furthermore, by including the latest constraints from LUX, PandaX-II, XENON1T and PICO-60, we find that, for almost all the considered models, the predicted CDMS-Si signal regions are either severely constrained or completely excluded by the LUX, PandaX-II, XENON1T and PICO-60 data, including the most promising Xe-phobic exothermic DM models with/without a light mediator. Therefore, we conclude that it is very difficult for the present DM framework to explain the CDMS-Si excess.

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Chao-Qiang Geng, Da Huang, Chun-Hao Lee. 2017-09-18. Exothermic Dark Matter with Light Mediator after LUX and PandaX-II in 2016. https://doi.org/10.1016/j.dark.2017.09.008

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