Direct Detection of Light 'Ge-phobic' Exothermic Dark Matter

Autor:	Gelmini, Graciela B., Georgescu, Andreea, Huh, Ji-Haeng
Rok vydání:	2014
Předmět:	High Energy Physics - Phenomenology Astrophysics - Cosmology and Nongalactic Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1088/1475-7516/2014/07/028
Popis:	We present comparisons of direct dark matter (DM) detection data for light WIMPs with exothermic scattering with nuclei (exoDM), both assuming the Standard Halo Model (SHM) and in a halo model - independent manner. Exothermic interactions favor light targets, thus reducing the importance of upper limits derived from xenon targets, the most restrictive of which is at present the LUX limit. In our SHM analysis the CDMS-II-Si and CoGeNT regions become allowed by these bounds, however the recent SuperCDMS limit rejects both regions for exoDM with isospin-conserving couplings. An isospin-violating coupling of the exoDM, in particular one with a neutron to proton coupling ratio of $-0.8$ (which we call "Ge-phobic"), maximally reduces the DM coupling to germanium and allows the CDMS-II-Si region to become compatible with all bounds. This is also clearly shown in our halo-independent analysis. Comment: 14 pages, 10 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1404.7484 Zobrazit plný text záznamu View this record from Arxiv