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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• Proposal for testing lepton universality in Upsilon decays at a B-factory running at ${\rm Y}(3S)$

Cited by in corpus (3)

• Discovering the Higgs with Low Mass Muon Pairs
• The PAMELA excess from neutralino annihilation in the NMSSM
• A light CP-odd Higgs boson and the muon anomalous magnetic moment