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

by Hsu, C.-L. , Jin, Y. , Nakazawa, H. , Nakao, M. , Hayashii, H. , Starič, M. , Gaur, V. , Kiesling, C. , Hayasaka, K. , Kinoshita, K. , Herrmann, D. , Kodyš, P. , Doležal, Z. , Belous, K. , Di Capua, F. , Gudkova, K. , Kim, C. H. , Itoh, R. , Unno, Y. , Yuan, C. Z. , Ferber, T. , Branchini, P. , De Pietro, G. , Miyabayashi, K. , Prim, M. T. , Zhang, Z. P. , Epifanov, D. , Uehara, S. , Gioi, L. Li , Ogawa, S. , Paul, S. , Inami, K. , Hara, T. , Schwanda, C. , Ono, H. , Shwartz, B. , Ecker, P. , Patra, S. , Mohanty, G. B. , Fulsom, B. G. , Kumara, K. , Nishida, S. , Graziani, E. , Wang, M.-Z. , De Nardo, G. , Jacobs, W. W. , Schnell, G. , Podobnik, T. , Savinov, V. , Krokovny, P. , Kovalenko, E. , Dingfelder, J. , Yook, Y. , Kwon, Y.-J. , Niiyama, M. , Trabelsi, K. , Li, L. K. , Ayad, R. , Yuan, L. , Senyo, K. , Tenchini, F. , Campajola, M. , Kim, D. Y. , Prencipe, E. , Russo, G. , Cho, K. , Goldenzweig, P. , Bennett, J. , Choi, S.-K. , Santelj, L. , Lam, T. , Korpar, S. , Choi, Y. , Meier, F. , Natochii, A. , Pedlar, T. K. , Singh, J. B. , Choudhury, S. , Park, J. , Won, E. , Banerjee, Sw , Prell, S. , Budano, A. , Shan, W. , Liventsev, D. , Solovieva, E. , Hadjivasiliou, C. , Biswas, D. , Ipsita, N. , Ma, Y. , Park, S.-H. , Ishikawa, A. , Matvienko, D. , Pardi

in Classical and Quantum Gravitation / Collaboration / Confidence intervals / e +-e − Experiments / Elementary Particles / Flavors / Leptons / Neutrinos / Particle spin / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / Sensors / Simulation / String Theory / Tau Physics

2025

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

2025

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

2025

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Journal Article

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

Hsu, C.-L.,

Jin, Y.,

Nakazawa, H.,

Nakao, M.,

Hayashii, H.,

Starič, M.,

Gaur, V.,

Kiesling, C.,

Hayasaka, K.,

Kinoshita, K.,

Herrmann, D.,

Kodyš, P.,

Doležal, Z.,

Belous, K.,

Di Capua, F.,

Gudkova, K.,

Kim, C. H.,

Itoh, R.,

Unno, Y.,

Yuan, C. Z.,

Ferber, T.,

Branchini, P.,

De Pietro, G.,

Miyabayashi, K.,

Prim, M. T.,

Zhang, Z. P.,

Epifanov, D.,

Uehara, S.,

Gioi, L. Li,

Ogawa, S.,

Paul, S.,

Inami, K.,

Hara, T.,

Schwanda, C.,

Ono, H.,

Shwartz, B.,

Ecker, P.,

Patra, S.,

Mohanty, G. B.,

Fulsom, B. G.,

Kumara, K.,

Nishida, S.,

Graziani, E.,

Wang, M.-Z.,

De Nardo, G.,

Jacobs, W. W.,

Schnell, G.,

Podobnik, T.,

Savinov, V.,

Krokovny, P.,

Kovalenko, E.,

Dingfelder, J.,

Yook, Y.,

Kwon, Y.-J.,

Niiyama, M.,

Trabelsi, K.,

Li, L. K.,

Ayad, R.,

Yuan, L.,

Senyo, K.,

Tenchini, F.,

Campajola, M.,

Kim, D. Y.,

Prencipe, E.,

Russo, G.,

Cho, K.,

Goldenzweig, P.,

Bennett, J.,

Choi, S.-K.,

Santelj, L.,

Lam, T.,

Korpar, S.,

Choi, Y.,

Meier, F.,

Natochii, A.,

Pedlar, T. K.,

Singh, J. B.,

Choudhury, S.,

Park, J.,

Won, E.,

Banerjee, Sw,

Prell, S.,

Budano, A.,

Shan, W.,

Liventsev, D.,

Solovieva, E.,

Hadjivasiliou, C.,

Biswas, D.,

Ipsita, N.,

Ma, Y.,

Park, S.-H.,

Ishikawa, A.,

Matvienko, D.,

Pardi

2025

Overview

A bstract 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 × 10 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: ( τ ± → e ± α ) < (0.4–6.4) × 10 − 4 and ( 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 .

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Publisher

Springer Berlin Heidelberg,Springer Nature B.V,SpringerOpen

Subject

Classical and Quantum Gravitation

/ Collaboration

/ Confidence intervals

/ e +-e − Experiments

/ Elementary Particles

/ Flavors

/ Leptons