Search for lepton-flavor-violating tau decays to ℓα at Belle

Search for lepton-flavor-violating tau decays to ℓα at Belle

Abstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e + e − collider. We find no evidence of...

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Main Authors: The BELLE collaboration, K. Uno, K. Hayasaka, K. Inami, H. Aihara, R. Ayad, Sw. Banerjee, K. Belous, J. Bennett, M. Bessner, D. Biswas, D. Bodrov, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, G. De Nardo, G. De Pietro, F. Di Capua, J. Dingfelder, Z. Doležal, P. Ecker, D. Epifanov, T. Ferber, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, E. Graziani, Y. Guan, K. Gudkova, C. Hadjivasiliou, T. Hara, H. Hayashii, D. Herrmann, C.-L. Hsu, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, Y. Jin, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Krokovny, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, T. Lam, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, D. Matvienko, F. Meier, M. Merola, K. Miyabayashi, G. B. Mohanty, M. Nakao, H. Nakazawa, A. Natochii, M. Niiyama, S. Nishida, S. Ogawa, H. Ono, S. Pardi, J. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, L. E. Piilonen, T. Podobnik, S. Prell, E. Prencipe, M. T. Prim, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, W. Shan, J.-G. Shiu, B. Shwartz, F. Simon, J. B. Singh, E. Solovieva, M. Starič, M. Sumihama, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, S. Uehara, T. Uglov, Y. Unno, S. Uno, M.-Z. Wang, E. Won, B. D. Yabsley, Y. Yook, C. Z. Yuan, L. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich
Format: Article
Language:English
Published: SpringerOpen 2025-08-01
Series:Journal of High Energy Physics
Subjects:
e +-e − Experiments
Tau Physics
Online Access:https://doi.org/10.1007/JHEP08(2025)155
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Summary:Abstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 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 ± → e ± α) < (0.4–6.4) × 10 −4 and $$\mathcal{B}$$ (τ ± → μ ± α) < (0.2–3.5) × 10 −4 at 95% confidence level for an α mass in the range 0.0 ≤ m α ≤ 1.6 GeV/c 2.
ISSN:1029-8479

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