New contribution to WIMP-nucleus scattering

Details New contribution to WIMP-nucleus scattering New contribution to WIMP-nucleus scattering

2003-09-03

arxiv.org/abs/astro-ph/0309115v2

Phys.Rev.Lett.91:231301,2003

Astronomy and Astrophysics

Astrophysics

Accepted by PRL. Small modifications in abstract and text

Scientific paper

10.1103/PhysRevLett.91.231301

A weakly-interacting massive particle (WIMP) is perhaps the most promising candidate for the dark matter in the Galactic halo. The WIMP detection rate in laboratory searches is fixed by the cross section for elastic WIMP-nucleus scattering. Here we calculate the contribution to this cross section from two-nucleon currents from pion exchange in the nucleus, and show that it may in some cases be comparable to the one-nucleon current that has been considered in prior work, and perhaps help resolve the discrepancies between the various direct dark-matter search experiments. We provide simple expressions that allow these new contributions to be included in current calculations.

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