The Up-Shot of Inelastic Down-Scattering at CDMS-Si

Abstract

We study dark matter that inelastically scatters and de-excites in direct detection experiments, as an interpretation of the CDMS-Si events in light of the recent LUX data. The constraints from LUX and XENON10 require the mass-splitting between the DM excited and de-excited states to be $|\delta |\gtrsim 50$ keV. At the same time, the CDMS-Si data itself do not allow for a consistent DM interpretation for mass splittings larger than $|\delta |\sim$200 keV. We find that a low threshold analysis will be needed to rule out this interpretation of the CDMS-Si events. In a simple model with a kinetically mixed dark photon, we show that the CDMS-Si rate and the thermal relic abundance can both be accommodated.

10 pages, 3 figures; updated to match PRD version

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• A systematic halo-independent analysis of direct detection data within the framework of Inelastic Dark Matter
• Direct Detection of Light "Ge-phobic" Exothermic Dark Matter
• Pinning down inelastic dark matter in the Sun and in direct detection
• Direct Detection of Exothermic Dark Matter with Light Mediator
• Exothermic isospin-violating dark matter after SuperCDMS and CDEX
• Higgsphobic and fermiophobic Z' as a single dark matter candidate
• Effective scalar four-fermion interaction for Ge-phobic exothermic dark matter and the CDMS-II Silicon excess
• Exothermic Dark Matter with Light Mediator after LUX and PandaX-II in 2016