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Bottomonium spectroscopy with mixing of eta_b states and a light CP-odd Higgs

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arxiv 0907.0348 v3 pith:MYRSW5RN submitted 2009-07-02 hep-ph

Florian Domingo , Ulrich Ellwanger , Miguel-Angel Sanchis-Lozano This is my paper · ORCID
classification hep-ph
keywords massbabarcp-oddhiggsmixingpredictionsbottomoniumbranching
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The mass of the eta_b(1S), measured recently by BABAR, is significantly lower than expected from QCD predictions for the Upsilon(1S) - eta_b(1S) hyperfine splitting. We suggest that the observed eta_b(1S) mass is shifted downwards due to a mixing with a CP-odd Higgs scalar A with a mass m_A in the range 9.4 - 10.5 GeV compatible with LEP, CLEO and BABAR constraints. We determine the resulting predictions for the spectrum of the eta_b(nS) - A system and the branching ratios into tau^+ tau^- as functions of m_A.

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  1. Lattice QCD determination of the radiative decay rates $h_{c}\to \eta_{c}\, \gamma$ and $h_{b}\to \eta_{b}\, \gamma$

    hep-lat 2025-04 conditional novelty 7.0 of 10

    Using five lattice spacings with physical quark masses, the authors obtain Gamma(h_c->eta_c gamma)=0.604(24) MeV and the first lattice QCD estimate Gamma(h_b->eta_b gamma)=46.0(4.8) keV.

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