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Shen, C P; Adachi, I; Al Said, S; Asner, D M; Atmacan, H; Babu, V; Bessner, M; Bhardwaj, V; Bilka, T; Bobrov, A; Bračko, M; Browder, T E; Campajola, M; Červenkov, D; Chang, P; Chen, A; Cheon, B G; Cho, K; Choi, S-K; Choudhury, S; Cunliffe, S; De Nardo, G; Di Capua, F; Doležal, Z; Ferber, T; Ferlewicz, D; Fulsom, B G; Gaur, V; Gabyshev, N; Graziani, E; Guan, Y; Hayasaka, K; Hedges, M T; Hou, W-S; Inami, K; Itoh, R; Iwasaki, M; Kahn, J; Kiesling, C; Kim, K-H; Kim, Y-K; Kodyš, P; Kohani, S; Korpar, S; Križan, P; Kroeger, R; Krokovny, P; Kumar, R; Kumara, K; Kwon, Y-J; Laurenza, M; Lee, S C; Li, J; Li, Y; Li, Y B; Libby, J; Lieret, K; Martini, A; Masuda, M; Metzner, F; Mohanty, G B; Mussa, R; Natkaniec, Z; Nishimura, K; Ogawa, K; Oskin, P; Pakhlov, P; Pang, T; Patra, S; Paul, S; Podobnik, T; Prencipe, E; Rout, N; Sangal, A; Sanuki, T; Savinov, V; Schnell, G; Sevior, M E; Shapkin, M; Sharma, C; Shiu, J-G; Stanič, S; Stottler, Z S; Sumiyoshi, T; Tamponi, U; Tanida, K; Tenchini, F; Uglov, T; Unno, Y; Uno, K; Vahsen, S E; Varner, G; Wang, D; Wang, E; Wang, M-Z; Yabsley, B D; Yang, S B; Yusa, Y; Zhai, Y; Zhilich, V
Physical review letters, 02/2022, Letnik: 128, Številka: 8Journal Article
We search for a light Higgs boson (A^{0}) 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 158×10^{6} ϒ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant A^{0} signals in the mass range from the τ^{+}τ^{-} or μ^{+}μ^{-} threshold to 9.2 GeV/c^{2} are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for ϒ(1S)→γA^{0} and A^{0}→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)→γA^{0}(→τ^{+}τ^{-}) production. For A^{0}→μ^{+}μ^{-}, the upper limits on the product branching fractions for ϒ(1S)→γA^{0} and A^{0}→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 f_{ϒ(1S)} and mixing angle sinθ_{A^{0}} are also given.
