Search for a low-mass Higgs boson in Y(3S)-->gamma A⁰, A⁰-->tau+tau- at BABAR
The BABAR Collaboration · Aubert, B.
Original · EN
We search for a light Higgs boson, A⁰, in the radiative decay Υ(3S)→γA⁰, A⁰→τ+τ-, τ+→ e+νₑ ντ or τ+→ μ+ νμ ντ. The data sample contains 122 million Υ(3S) events recorded with the detector. We find no evidence for a narrow structure in the studied τ+τ- invariant mass region of 4.03<mτ₊τ₋<10.10. We exclude at the 90% confidence level (C.L.) a low mass Higgs decaying to τ+τ- with a product branching fraction B(Υ(3S)→γA⁰)× B(A⁰→τ+τ-) >(1.5-16)× 10⁻⁵ across the mτ₊τ₋ range. We also set a 90% C.L. upper limit on the τ+τ--decay of the ηb at B(ηb→ τ+τ-)<8%.
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