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

2011/12/19 by Grigoris Panotopoulos, Panotopoulos, Grigoris, Miguel-Angel Sanchis-Lozano +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #astro-ph.HE #hep-ex #hep-ph

paper · pdf · doi:10.48550/arxiv.1112.4387

We have incorporated a discussion on instanton-induced effects as a possible non-perturbative contribution to WIMP scattering off nuclei. 6 pages, 2 figures

arxiv created 2012/03/05 · arxiv updated 2012/03/06

Abstract

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/q² suppression factors, perhaps giving a new insight into the current controversial situation concerning direct search experiments of dark matter.

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