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  • Search for lepton-flavor-violating $\tau^- \to \mu^-\mu^+\mu^-$ decays at Belle II
    Adachi, I; Aloisio, A; Asner, D. M; Aushev, V; Bahinipati, S; Beaubien, A; Bennett, J. V; Bertacchi, V; Bianchi, F; Biswas, D; Budano, A; Campajola, M; Cao, L; Casarosa, G; Cecchi, C; Cerasoli, J; Chen, C; Chilikin, K; Cho, H. -E; Dey, S; Doležal, Z; Dugic, K; Ecker, P; Gabrielli, A; Garcia-Hernandez, M; Garg, R; Gaudino, G; Gaz, A; Ghosh, D; Ghumaryan, H; Giakoustidis, G; Giri, A; Glazov, A; Gruberová, Z; Gu, T; Harris, C; Hayasaka, K; Hayashii, H; Hearty, C; Heidelbach, A; Hoek, M; Horak, P; Ipsita, N; Jin, Y; Kaleta, M; Kaliyar, A. B; Kinoshita, K; Kodyš, P; Konno, T; Kumara, K; Lemettais, C; Li, S. X; Li, Y; Liu, M. H; Liventsev, D; Longo, S; Lueck, T; Mancinelli, G; Manoni, E; Marinas, C; Massaccesi, L; Maurya, S. K; McKenna, J. A; Mehta, R; Miyabayashi, K; Nakamura, I; Ono, H; Otani, F; Praz, C; Prell, S; Prencipe, E; Prudiev, I; Purwar, H; Reif, M; Rizzo, G; Roehrken, M; Scavino, B; Schneider, S; Sevior, M. E; Sfienti, C; Shi, X. D; Shillington, T; Sobie, R. J; Sokolov, A; Spataro, S; Svidras, H; Tanida, K; Tonelli, D; Torassa, E; Ueda, I; Uglov, T; Ushiroda, Y; Vismaya, V. S; Vitale, L; Vossen, A; Wang, E; Xu, X. P; Yook, Y. M; Zhang, B; Zhilich, V

    arXiv (Cornell University), 05/2024
    Journal Article

    We present the result of a search for the charged-lepton-flavor violating decay $\tau^- \to \mu^-\mu^+\mu^-$ using a $424fb^{-1}$ sample of data recorded by the Belle II experiment at the SuperKEKB $e^{-}e^{+}$ collider. The selection of $e^{-}e^{+}\to\tau^+\tau^-$ events is based on an inclusive reconstruction of the non-signal tau decay, and on a boosted decision tree to suppress background. We observe one signal candidate, which is compatible with the expectation from background processes. We set a $90\%$ confidence level upper limit of $1.9 \times 10^{-8}$ on the branching fraction of the \taumu decay, which is the most stringent bound to date.

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