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Search for a Light Higgs Boson in Single-Photon Decays of ϒ (1S) Using ϒ (2S) →π+π- ϒ (1S) Tagging Method
- Authors
- 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.; Borah, J.; Bračko, M.; Branchini, P.; Browder, T.E.; Budano, A.; Campajola, M.; Červenkov, D.; Chang, M.-C.; Chang, P.; Chekelian, V.; Chen, A.; Cheon, B.G.; Chilikin, K.; Cho, H.E.; Cho, K.; Cho, S.-J.; Choi, S.-K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Das, S.; Dash, N.; De, Nardo G.; De, Pietro G.; Dhamija, R.; Di, Capua F.; DoleŽal, Z.; Dong, T.V.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B.G.; Garg, R.; Gaur, V.; Gabyshev, N.; Giri, A.; Goldenzweig, P.; Golob, B.; Graziani, E.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hedges, M.T.; Hou, W.-S.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W.W.; Jang, E.-J.; Jin, Y.; Joo, K.K.; Kahn, J.; Kaliyar, A.B.; Kang, K.H.; Kawasaki, T.; Kiesling, C.; Kim, C.H.; Kim, D.Y.; Kim, K.-H.; Kim, Y.-K.; Kinoshita, K.; Kodyš, P.; Kohani, S.; Konno, T.; Korobov, A.; Korpar, S.; Kovalenko, E.; KriŽan, P.; Kroeger, R.; Krokovny, P.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y.-J.; Lam, T.; Laurenza, M.; Lee, S.C.; Li, J.; Li, L.K.; Li, Y.; Li, Y.B.; Li, Gioi L.; Libby, J.; Lieret, K.; Liventsev, D.; Martini, A.; Masuda, M.; Matsuda, T.; Matvienko, D.; Maurya, S.K.; Meier, F.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mizuk, R.; Mohanty, G.B.; Mussa, R.; Nakao, M.; Narwal, D.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nisar, N.K.; Nishida, S.; Nishimura, K.; Ogawa, K.; Ogawa, S.; Ono, H.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pang, T.; Pardi, S.; Park, S.-H.; Patra, S.; Paul, S.; Pedlar, T.K.; Pestotnik, R.; Piilonen, L.E.; Podobnik, T.; Prencipe, E.; Prim, M.T.; Röhrken, M.; Rostomyan, A.; Rout, N.; Russo, G.; Sahoo, D.; Sandilya, S.; Sangal, A.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schueler, J.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M.E.; Shapkin, M.; Sharma, C.; Shebalin, V.; Shiu, J.-G.; Shwartz, B.; Singh, J.B.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Stottler, Z.S.; Sumihama, M.; Sumisawa, K.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, K.; Uno, S.; Urquijo, P.; Vahsen, S.E.; Van, Tonder R.; Varner, G.; Vinokurova, A.; Waheed, E.; Wang, D.; Wang, E.; Wang, M.-Z.; Watanuki, S.; Won, E.; Yabsley, B.D.; Yan, W.; Yang, S.B.; Ye, H.; Yelton, J.; Yin, J.H.; Yusa, Y.; Zhai, Y.; Zhang, Z.P.; Zhilich, V.; Zhukova, V.
- Issue Date
- Feb-2022
- Publisher
- American Physical Society
- Citation
- Physical Review Letters, v.128, no.8
- Journal Title
- Physical Review Letters
- Volume
- 128
- Number
- 8
- ISSN
- 0031-9007
1079-7114
- 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 authors. Published by the American Physical Society.
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