Non-perturbative effects in WIMP scattering off nuclei in the NMSSM

Details Non-perturbative effects in WIMP scattering off nuclei in the NMSSM Non-perturbative effects in WIMP scattering off nuclei in the NMSSM

2011-12-19

arxiv.org/abs/1112.4387v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

We have incorporated a discussion on instanton-induced effects as a possible non-perturbative contribution to WIMP scattering

Scientific paper

We explore a scenario in the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM) with both a light O(10) GeV neutralino and a CP-odd Higgs boson with significant coupling to down-type fermions, evading all current B physics, LEP and WMAP bounds. Motivated by a possible slight lepton universality breaking hinted in Upsilon decays, we consider the effect of the mixing of eta(b) resonances with the pseudoscalar Higgs on the spin-dependent scattering neutralino cross section off nucleons. We conclude that this mechanism could be relevant provided that non-perturbative effects enhance the effective eta(b)-nucleon coupling, taking over velocity/q^2 suppression factors, perhaps giving a new insight into the current controversial situation concerning direct search experiments of dark matter.

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