Authors: Ran Ding Yi Liao
Publish Date: 2012/04/11
Volume: 2012, Issue: 4, Pages: 54-
Abstract
There is no indication so far on the spin of dark matter particles We consider the possibility in this work that a spin3/2 particle acts as dark matter Employing the approach of effective field theory we list all possible 4fermion effective interactions between a pair of such fields and a pair of ordinary fermion fields We investigate the implications of the proposal on the relic density the antiproton to proton flux ratio in cosmic rays and the elastic scattering off nuclei in direct detection While the relic density and flux ratio are sensitive to all interactions albeit at different levels the direct detection is only sensitive to a few of them Using the observed data and experimental bounds we set constraints on the relation of couplings and dark particle mass In particular we find that some mass ranges can already be excluded by jointly applying the observed relic density on the one side and the measured antiproton to proton flux ratio or the upper bounds from direct detection on the other
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