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Main Authors: Belle Collaboration, Uno, K., Hayasaka, K., Inami, K., Aihara, H., Ayad, R., Banerjee, Sw., Belous, K., Bennett, J., Bessner, M., Biswas, D., Bodrov, D., Bračko, M., Branchini, P., Browder, T. E., Budano, A., Campajola, M., Cho, K., Choi, S. -K., Choi, Y., Choudhury, S., De Nardo, G., De Pietro, G., Di Capua, F., Dingfelder, J., Doležal, Z., Ecker, P., Epifanov, D., Ferber, T., Fulsom, B. G., Gaur, V., Giri, A., Goldenzweig, P., Graziani, E., Guan, Y., Gudkova, K., Hadjivasiliou, C., Hara, T., Hayashii, H., Herrmann, D., Hsu, C. -L., Ipsita, N., Ishikawa, A., Itoh, R., Iwasaki, M., Jacobs, W. W., Jin, Y., Kiesling, C., Kim, C. H., Kim, D. Y., Kim, K. -H., Kinoshita, K., Kodyš, P., Korobov, A., Korpar, S., Kovalenko, E., Krokovny, P., Kumar, R., Kumara, K., Kuzmin, A., Kwon, Y. -J., Lam, T., Li, L. K., Li, Y. B., Gioi, L. Li, Libby, J., Liventsev, D., Ma, Y., Masuda, M., Matsuda, T., Matvienko, D., Meier, F., Merola, M., Miyabayashi, K., Mohanty, G. B., Nakao, M., Nakazawa, H., Natochii, A., Niiyama, M., Nishida, S., Ogawa, S., Ono, H., Pardi, S., Park, J., Park, S. -H., Patra, S., Paul, S., Pedlar, T. K., Piilonen, L. E., Podobnik, T., Prell, S., Prencipe, E., Prim, M. T., Russo, G., Sandilya, S., Santelj, L., Savinov, V., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Shan, W., Shiu, J. -G., Shwartz, B., Simon, F., Singh, J. B., Solovieva, E., Starič, M., Sumihama, M., Takizawa, M., Tanida, K., Tenchini, F., Trabelsi, K., Uehara, S., Uglov, T., Unno, Y., Uno, S., Wang, M. -Z., Won, E., Yabsley, B. D., Yook, Y., Yuan, C. Z., Yuan, L., Yusa, Y., Zhang, Z. P., Zhilich, V.
Format: Preprint
Published: 2025
Subjects:
High Energy Physics - Experiment
Online Access:https://arxiv.org/abs/2503.22195
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Table of Contents:
  • We report a search for the lepton-flavor-violating decays $τ^{\pm}\to\ell^{\pm}α$~($\ell=e,μ$), where $α$ is an undetected spin-0 particle, such as an axion-like particle using $736\times10^{6}$ tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95\% confidence level: $\mathcal{B}(τ^{\pm}\rightarrow e^{\pm}α)$ $<$ $(0.4$--$6.4)\times10^{-4}$ and $\mathcal{B}(τ^{\pm}\rightarrow μ^{\pm}α)$ $<$ $(0.2$--$3.5)\times10^{-4}$ at 95\% confidence level for an $α$ mass in the range $0.0\leq m_α\leq 1.6$~GeV/$c^{2}$.

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