Reduced branching ratio for H → AA → 4 τ from A − η b mixing
نویسندگان
چکیده
Models with an extended Higgs sector, as the NMSSM, allow for scenarios where the Standard Model-like CP-even Higgs boson H decays dominantly as H → AA → 4 τ where A is a light CP-odd Higgs boson. Tight constraints on this scenario in the form of lower bounds on MH have recently been published by the ALEPH group. We show that, due to A − ηb mixing, the branching ratio H → AA → 4 τ is strongly reduced for MA in the range 9 − 10.5 GeV. This is the range of MA in which the tension between the observed ηb(1S) mass and its prediction based on QCD can be resolved due to mixing, and which is thus still consistent with a light CP-even Higgs boson H satisfying LEP constraints with a mass well below 114 GeV. This result is practically independent from the coupling of A to b quarks.
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تاریخ انتشار 2011