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  • Search for lepton-flavor-violating \(\tau^- \to \ell^-\phi\) decays in 2019-2021 Belle II data
    Atmacan, H; Aushev, T; Aversano, M; Bernlochner, F U; Bilokin, S; Bondar, A; Chirapatpimol, K; Cinabro, D; Corona, L; de Sangro, R; Dey, S; Eliachevitch, M; Finck, C; Finocchiaro, G; Fischer, P; Fulsom, B G; Garmash, A; Gobbo, B; Gong, G; Gradl, W; Guan, Y; Hill, E C; Hirata, H; Iijima, T; Inguglia, G; Jabbar, J Irakkathil; Itoh, R; Iwasaki, M; Jackson, P; Jacobs, W W; Kawasaki, T; Kim, D Y; Kimmel, T D; Konno, T; Kumara, K; Laurenza, M; Lautenbach, K; Leboucher, R; Leitl, P; Libby, J; Liu, Q Y; Luo, T; Maggiora, M; Maharana, S P; Maity, S; Manfredi, R; Marcello, S; Massaccesi, L; Masuda, M; McNeil, J; Meier, F; Merola, M; Mizuk, R; Mrvar, M; Nakamura, K R; Natochii, A; Nayak, L; Nishimura, K; Ono, H; Pakhlova, G; Pang, T; Panta, A; S -H Park; Piilonen, L E; Podobnik, T; Praz, C; Purohit, M V; Raeuber, G; Raiz, S; Rocchetti, P; Sangal, A; Sato, Y; Schreeck, H; Schueler, J; Shebalin, V; Shen, C P; Sibidanov, A; Singh, J B; Solovieva, E; Spataro, S; Spruck, B; Suzuki, S Y; Tamponi, U; Tao, Y; Tenchini, F; Toutounji, N; Tsaklidis, I; Ueda, I; Uematsu, Y; Urquijo, P; Vinokurova, A; Wach, B; Wang, Z; Watanabe, M; Watanuki, S; Wiechczynski, J; Yabsley, B D; Yin, J H; Zani, L; Zhang, Z

    arXiv.org, 05/2023
    Paper

    We report a search for lepton-flavor-violating decays \(\tau^- \to \ell^- \phi\) (\(\ell^- =e^-,\mu^-\)) at the Belle II experiment, using a sample of electron-positron data produced at the SuperKEKB collider in 2019-2021 and corresponding to an integrated luminosity of 190 fb\(^{-1}\). We use a new untagged selection for \(e^+e^- \to \tau^+\tau^-\) events, where the signal \(\tau\) is searched for as a neutrinoless final state of a single charged lepton and a \(\phi\) meson and the other \(\tau\) is not reconstructed in any specific decay mode, in contrast to previous measurements by the BaBar and Belle experiments. We find no evidence for \(\tau^- \to \ell^- \phi\) decays and obtain upper limits on the branching fractions at 90% confidence level of 23 \(\times 10^{-8}\) and 9.7\(\times 10^{-8}\) for \(\tau^- \rightarrow e^-\phi\) and \(\tau^- \rightarrow \mu^-\phi\), respectively

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