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We propose an experimental test of a scenario in the Next-to-MinimalSupersymmetric Standard Model in which both the lightest scalar and thelightest pseudoscalar Higgs bosons have masses around 125 GeV. The pseudoscalarcan contribute significantly to the gamma.gamma rate at the LHC due to lightHiggsino-like charginos in its effective one-loop coupling to two photons. Suchcharginos are obtained for small values of the mu_eff parameter which alsoresults in enhanced b.b-bar and tau+.tau- rates compared to those expected fora Standard Model Higgs boson. This scenario should result in a cleardiscrepancy between the observed rates in these three decay channels and thosein the WW and ZZ channels, since the pseudoscalar does not couple to the W andZ bosons. However, in the dominant gluon fusion production mode thepseudoscalar will stay hidden behind the SM-like scalar Higgs boson and inorder for it to be observable the associated b.b-bar.h production mode has tobe considered, the cross section for which is tiny in the Standard Model buttan.beta-enhanced in supersymmetry. We analyze the constrained NMSSM withnon-universal Higgs sector parameters and identify regions of its parameterspace where the lightest pseudoscalar with mass around 125 GeV and stronglyenhanced gamma.gamma (up to 60%), b.b-bar and tau+.tau- rates in the b.b-bar.hmode can be obtained.

Simultaneous enhancement in gamma.gamma, b.b-bar and tau+.tau- rates in the NMSSM with nearly degenerate scalar and pseudoscalar Higgs bosons