Radiative Upsilon decays and a light pseudoscalar Higgs in the NMSSM

Abstract

We study possible effects of a light CP-odd Higgs boson on radiative Upsilon decays in the Next-to-Minimal Supersymmetric Standard Model. Recent constraints from CLEO on radiative Upsilon(1S) decays are translated into constraints on the parameter space of CP-odd Higgs boson masses and couplings, and compared to constraints from B physics and the muon anomalous magnetic moment. Possible Higgs - eta_b(nS) mixing effects are discussed, notably in the light of the recent measurement of the eta_b(1S) mass by Babar: The somewhat large Upsilon(1S) - eta_b(1S) hyperfine splitting could easily be explained by the presence of a CP-odd Higgs boson with a mass in the range 9.4 - 10.5 GeV. Then, tests of lepton universality in inclusive radiative Upsilon decays can provide a visible signal in forthcoming experimental data.

20 pages, 11 Figs, references corrected

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• New constraints on a light CP-odd Higgs boson and related NMSSM Ideal Higgs Scenarios
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• Search for hadronic decays of a light Higgs boson in the radiative decay Upsilon --> gamma A0
• Discovering the Higgs with Low Mass Muon Pairs
• Collider constraints on light pseudoscalars
• A light NMSSM pseudoscalar Higgs boson at the LHC redux
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• The NMSSM and String Theory
• Charming ALPs
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• Revisiting the production of ALPs at B-factories
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• Light Higgs bosons in phenomenological NMSSM
• The PAMELA excess from neutralino annihilation in the NMSSM
• Probing the $\mu \nu$SSM with light scalars, pseudoscalars and neutralinos from the decay of a SM-like Higgs boson at the LHC
• A light CP-odd Higgs boson and the muon anomalous magnetic moment
• Test of lepton universality in Upsilon(1S) decays at BaBar
• Cosmic-ray antiproton constraints on light singlino-like dark matter candidates
• Decays of a NMSSM CP-odd Higgs in the low-mass region
• Direct production of a light CP-odd Higgs boson at the Tevatron and LHC
• Analysis of the Higgs potentials for two doublets and a singlet
• NMSSM interpretations of the observed Higgs signal
• Updated constraints from radiative ${\rm Y}$ decays on a light CP-odd Higgs
• Rare Z-decay into light CP-odd Higgs bosons: a comparative study in different new physics models
• Confronting the neutralino and chargino sector of the NMSSM to the multi-lepton searches at the LHC
• W mass and Leptonic Z-decays in the NMSSM
• Current bounds and future prospects of light neutralino dark matter in NMSSM
• Reduced branching ratio for H -> AA -> 4 tau from A - eta_b mixing
• Hunting physics beyond the standard model with unusual $W^{\pm }$ and $Z$ decays
• A possible connection between neutrino mass generation and the lightness of a NMSSM pseudoscalar
• Implications of a New Light Scalar Near the Bottomonium Regime
• Probing light pseudoscalar, axial vector states through ${\eta }_b\to {\tau }^{+}{\tau }^{-}$
• Seeking the CP-odd Higgs via $h\to {\eta }_{c,b}{\ell }^{+}{\ell }^{-}$
• A Solution to the mu/Bmu Problem in Gauge Mediation with Hidden Gauge Symmetry
• Discovery potential of the NMSSM CP-odd Higgs at the LHC
• Discrimination of the light CP-odd scalars between in the NMSSM and in the SLHM
• Phenomenological Aspects of the Next-to-Minimal Supersymmetric Standard Model