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arXiv · 0808.2464

The New DAMA Dark-Matter Window and Energetic-Neutrino Searches

Dan Hooper·Frank Petriello·Kathryn M. Zurek·Marc Kamionkowski
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Abstract

Recently, the DAMA/LIBRA collaboration has repeated and reinforced their claim to have detected an annual modulation in their signal rate, and have interpreted this observation as evidence for dark-matter particles at the 8.2 sigma confidence level. Furthermore, it has also been noted that the effects of channeling may enable a WIMP that scatters elastically via spin-independent interactions from nuclei to produce the signal observed by DAMA/LIBRA without exceeding the limits placed by CDMS, XENON, CRESST, CoGeNT and other direct-detection experiments. To accommodate this signal, however, the mass of the responsible dark-matter particle must be relatively light, m_{DM} \lsim 10 GeV. Such dark-matter particles will become captured by and annihilate in the Sun at very high rates, leading to a potentially large flux of GeV-scale neutrinos. We calculate the neutrino spectrum resulting from WIMP annihilations in the Sun and show that existing limits from Super-Kamiokande can be used to close a significant portion of the DAMA region, especially if the dark-matter particles produce tau leptons or neutrinos in a sizable fraction of their annihilations. We also determine the spin-dependent WIMP-nuclei elastic-scattering parameter space consistent with DAMA. The constraints from Super-Kamiokande on the spin-dependent scenario are even more severe--they exclude any self-annihilating WIMP in the DAMA region that annihilates 1% of the time or more to any combination of neutrinos, tau leptons, or charm or bottom quarks.

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Dan Hooper, Frank Petriello, Kathryn M. Zurek, Marc Kamionkowski. 2008-08-19. The New DAMA Dark-Matter Window and Energetic-Neutrino Searches. https://doi.org/10.1103/physrevd.79.015010

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