Direct detection of dark matter in models with a light Z'

Details Direct detection of dark matter in models with a light Z' Direct detection of dark matter in models with a light Z'

2011-07-11

arxiv.org/abs/1107.2118v2

JHEP 1109:128,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 3 figures. v2: matches published version

Scientific paper

10.1007/JHEP09(2011)128

We discuss the direct detection signatures of dark matter interacting with nuclei via a Z' mediator, focussing on the case where both the dark matter and the $Z'$ have mass of a few GeV. Isospin violation (i.e. different couplings to protons and neutrons) arises naturally in this scenario. In particular it is possible to reconcile the preferred parameter regions inferred from the observed DAMA and CoGeNT modulations with the bounds from XENON100, which requires f_n/f_p = -0.7. Moreover, the Z' mediator can also yield a large spin-dependent cross-section which could contribute to the DAMA signal, while the spin-independent cross-section is adequate to explain the CoGeNT signal.

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