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

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

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Domingo, Florian; Ellwanger, Ulrich; Sanchis Lozano, Miguel Ángel

Aquest document és un/a article, creat/da en: 2009

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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