Neutrinos from WIMP annihilation in the Sun : Implications of a self-consistent model of the Milky Way's dark matter halo

Abstract

Upper limits on the spin-independent (SI) as well as spin-dependent (SD) elastic scattering cross sections of WIMPs with protons, imposed by the Super-Kamiokande (S-K) upper limit on the neutrino flux from WIMP annihilation in the Sun, and their compatibility with the "DAMA-compatible" regions of the WIMP parameter space within which the annual modulation signal observed by the DAMA/LIBRA experiment is compatible with the null results of other direct detection experiments, are studied within the frame work of a self-consistent model of the finite-size dark matter (DM) halo of the Galaxy, the parameters of which are determined by a fit to the rotation curve data of the Galaxy. We find that the S-K implied upper limits on the WIMP-proton elastic cross section as a function of WIMP mass impose stringent restrictions on the branching fractions of the various WIMP annihilation channels. For SI interaction, while the S-K upper limits are consistent with the DAMA-compatible region of the WIMP parameter space if the WIMPs annihilate dominantly to $\bbarb$\ and/or $\cbarc$, portions of the DAMA-compatible region can be excluded if WIMP annihilations to $\tautau$ and $ν\anu$ occur at larger than ~ 10% and 0.1% levels, respectively. For SD interaction, the restrictions on the possible annihilation channels are much more stringent, essentially ruling out the DAMA-compatible region of the WIMP parameter space if the relatively low-mass ($\sim$ 2 -- 20 GeV) WIMPs under consideration annihilate predominantly to any mixture of $\bbarb$, \ $\cbarc$, \ $\tautau$, \ and $ν\anu$ final states.

Replaced with revised version; Latest published results from Super-Kamiokande incorporated; quantitative limits on the branching fractions of various WIMP annihilation channels become more stringent by factors of 3 - 4; references added; overall conclusions unchanged; 17 pages, Latex, 6 Figures, accepted for publication in Phys. Rev. D

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Cited by in corpus (8)

• Rotation Curve of the Milky Way out to $\sim$ 200 kpc
• Dark Forces and Light Dark Matter
• Dark matter in the Sun: scattering off electrons vs nucleons
• Impact of Dark Matter Velocity Distributions on Capture Rates in the Sun
• Deriving the velocity distribution of Galactic Dark Matter particles from rotation curve data
• $\chi$aro$\nu$: a tool for neutrino flux generation from WIMPs
• Dark matter capture by the Sun: revisiting velocity distribution uncertainties
• On the Role of Neutrinos Telescopes in the Search for Dark Matter Annihilations in the Sun