This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.128.081804 in citations.
Please use the identifier: http://hdl.handle.net/2128/32616 in citations.
Search for a Light Higgs Boson in Single-Photon Decays of Υ(1S) Using Υ(2S)→π+π−Υ(1S) Tagging Method
Search for a Light Higgs Boson in Single-Photon Decays of Υ(1S) Using Υ(2S)→π+π−Υ(1S) Tagging Method
We search for a light Higgs boson (A0) decaying into a τ+τ− or μ+μ− pair in the radiative decays of Υ(1S). The production of Υ(1S) mesons is tagged by Υ(2S)→π+π−Υ(1S) transitions, using 158×106 Υ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider....
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Please use the identifier: http://hdl.handle.net/2128/32616 in citations.
We search for a light Higgs boson (A0) decaying into a τ+τ− or μ+μ− pair in the radiative decays of Υ(1S). The production of Υ(1S) mesons is tagged by Υ(2S)→π+π−Υ(1S) transitions, using 158×106 Υ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant A0 signals in the mass range from the τ+τ− or μ+μ− threshold to 9.2 GeV/c2 are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for Υ(1S)→γA0 and A0→τ+τ− varying from 3.8×10−6 to 1.5×10−4. Our results represent an approximately twofold improvement on the current world best upper limits for the Υ(1S)→γA0(→τ+τ−) production. For A0→μ+μ−, the upper limits on the product branching fractions for Υ(1S)→γA0 and A0→μ+μ− are at the same level as the world average limits, and vary from 3.1×10−7 to 1.6×10−5. The upper limits at 90% credibility level on the Yukawa coupling fΥ(1S) and mixing angle sinθA0 are also given. |