${\rm Y}\to \gamma A_1$ in the NMSSM at large tan beta

Abstract

We investigate the effects of the radiatively-generated tan beta-enhanced Higgs-singlet Yukawa couplings on the decay ${\rm Y}\to \gamma A_1$ in the NMSSM, where $A_1$ is the lightest CP-odd scalar. This radiative coupling is found to dominate in the case of a highly singlet Higgs pseudoscalar. The branching ratio for the production of such a particle is shown to be within a few orders of magnitude of current experimental constraints across a significant region of parameter space. This represents a potentially observable signal for experiments at present B-factories.

9 pages, LaTeX, 2 figures. Second result set for tan(beta)=10 included, clarifying remarks added, references updated. Version to be published in Physics Letters B

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Cited by in corpus (11)

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• Anomaly of Zbb coupling revisited in MSSM and NMSSM
• Radiative Upsilon decays and a light pseudoscalar Higgs in the NMSSM
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• Higgs-bosons couplings to quarks and leptons in the supersymmetric Standard Model with a gauge singlet