Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-12-19
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.
Panotopoulos Grigoris
Sanchis-Lozano Miguel-Angel
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