Capture of Inelastic Dark Matter in the Sun

Details Capture of Inelastic Dark Matter in the Sun Capture of Inelastic Dark Matter in the Sun

2009-05-11

arxiv.org/abs/0905.1333v2

JCAP 0908:037,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 7 figures, published version. Cosmetic changes to figures and some discussions clarified. Conclusions unchanged

Scientific paper

10.1088/1475-7516/2009/08/037

We consider the capture of dark matter in the Sun by inelastic scattering against nuclei as in the inelastic dark matter scenario. We show that, assuming a WIMP-nucleon cross-section of \sigma_n = 10^{-40}\cm^2 the resulting capture rate and density are sufficiently high so that current bounds on the muon neutrino flux from the Sun rule out any appreciable annihilation branching ratio of WIMPs into W^+W^-, Z^0Z^0, \tau^+\tau^-, t\bar{t} and neutrinos. Slightly weaker bounds are also available for annihilations into b\bar{b} and c\bar{c}. Annihilations into lighter particles that may produce neutrinos, such as \mu^+\mu^-, pions and kaons are unconstrained since those stop in the Sun before decaying. Interestingly enough, this is consistent with some recent proposals motivated by the PAMELA results for the annihilation of WIMPs into light bosons which subsequently decay predominantly into light leptons and pions.

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