Abstract
We investigate the effects of the radiatively-generated tanβ-enhanced Higgs-singlet Yukawa couplings on the decay ϒ→γA1 in the NMSSM, where A1 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.
Highlights
We investigate the effects of the radiatively-generated tan β-enhanced Higgs-singlet Yukawa couplings on the decay Υ → γA1 in the NMSSM, where A1 is the lightest CP-odd scalar
The μ parameter of the Minimal Supersymmetric extension of the Standard Model (MSSM) is replaced with an additional gauge singlet Higgs superfield Sand an effective doublet mixing term μeff is generated when the singlet field acquires a vacuum expectation value (VEV)
It has long been known that the NMSSM suffers from the formation of electroweak scale cosmic domain walls [2], mechanisms to resolve this problem have been suggested, e.g. [3]
Summary
We investigate the effects of the radiatively-generated tan β-enhanced Higgs-singlet Yukawa couplings on the decay Υ → γA1 in the NMSSM, where A1 is the lightest CP-odd scalar. Possibility.2 Such a signal has previously been considered in [7, 8], with the pseudoscalar coupling to b-quarks only through tree level singlet-doublet mixing.
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