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.

Search for a Light Higgs Boson in Single-Photon Decays of ϒ (1S) Using ϒ (2S) →π+π- ϒ (1S) Tagging Method / Jia, S., Shen, C.P., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bobrov, A., Bodrov, D., Bonvicini, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 128:8(2022), p. 081804. [10.1103/PhysRevLett.128.081804]

Search for a Light Higgs Boson in Single-Photon Decays of ϒ (1S) Using ϒ (2S) →π+π- ϒ (1S) Tagging Method

Campajola M.;De Nardo G.;Di Capua F.;Merola M.;Russo G.;
2022

Abstract

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.
2022
Search for a Light Higgs Boson in Single-Photon Decays of ϒ (1S) Using ϒ (2S) →π+π- ϒ (1S) Tagging Method / Jia, S., Shen, C.P., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bobrov, A., Bodrov, D., Bonvicini, G., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 128:8(2022), p. 081804. [10.1103/PhysRevLett.128.081804]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/884656
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