Search for lepton-flavor-violating decays at Belle and Belle II
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Adachi, I; Aggarwal, L; Ahmed, H; Ahn, Y; Aihara, H; Akopov, N; Alghamdi, S; Alhakami, M; Aloisio, A; Althubiti, N; Amos, K; Angelsmark, M ...
Published in: Journal of High Energy Physics
August 1, 2025
We present the results of a search for charged-lepton-flavor violating decays, where ℓ− is either an electron or a muon. We combine e+e− data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb−1) with samples recorded by the Belle experiment at the KEKB collider (980 fb−1) to obtain a sample of 1.3 billion e+e− → τ+τ− events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8 × 10−8 and 1.2 × 10−8 on the branching fractions of the decay modes and, respectively. These are the most stringent upper limits to date.
Duke Scholars
Published In
Journal of High Energy Physics
DOI
EISSN
1029-8479
Publication Date
August 1, 2025
Volume
2025
Issue
8
Related Subject Headings
- Nuclear & Particles Physics
- 5107 Particle and high energy physics
- 5106 Nuclear and plasma physics
- 4902 Mathematical physics
- 0206 Quantum Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0105 Mathematical Physics
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Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., … Fulsom, B. G. (2025). Search for lepton-flavor-violating decays at Belle and Belle II. In Journal of High Energy Physics (Vol. 2025). https://doi.org/10.1007/JHEP08(2025)092
Adachi, I., L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, et al. “Search for lepton-flavor-violating decays at Belle and Belle II.” In Journal of High Energy Physics, Vol. 2025, 2025. https://doi.org/10.1007/JHEP08(2025)092.
Adachi I, Aggarwal L, Ahmed H, Ahn Y, Aihara H, Akopov N, et al. Search for lepton-flavor-violating decays at Belle and Belle II. In: Journal of High Energy Physics. 2025.
Adachi, I., et al. “Search for lepton-flavor-violating decays at Belle and Belle II.” Journal of High Energy Physics, vol. 2025, no. 8, 2025. Scopus, doi:10.1007/JHEP08(2025)092.
Adachi I, Aggarwal L, Ahmed H, Ahn Y, Aihara H, Akopov N, Alghamdi S, Alhakami M, Aloisio A, Althubiti N, Amos K, Angelsmark M, Anh Ky N, Antonioli C, Asner DM, Atmacan H, Aushev V, Aversano M, Ayad R, Babu V, Baghel NK, Bahinipati S, Bambade P, Banerjee S, Barrett M, Bartl M, Baudot J, Baur A, Beaubien A, Becherer F, Becker J, Bennett JV, Bernlochner FU, Bertacchi V, Bertemes M, Bertholet E, Bessner M, Bettarini S, Bhuyan B, Bianchi F, Biswas D, Bobrov A, Bodrov D, Bondar A, Bonvicini G, Boschetti A, Bozek A, Bračko M, Branchini P, Browder TE, Budano A, Bussino S, Campagna Q, Campajola M, Cao L, Casarosa G, Cecchi C, Chang MC, Cheaib R, Cheema P, Cheon BG, Chilikin K, Chin J, Chirapatpimol K, Cho HE, Cho K, Cho SJ, Choi SK, Choudhury S, Cochran J, Consigny I, Corona L, Cui JX, De La Cruz-Burelo E, De La Motte SA, de Marino G, De Nardo G, De Pietro G, de Sangro R, Destefanis M, Dey S, Di Canto A, Dingfelder J, Doležal Z, Domínguez Jiménez I, Dong TV, Dorigo M, Dugic K, Dujany G, Ecker P, Epifanov D, Eppelt J, Feichtinger P, Ferber T, Fillinger T, Finck C, Finocchiaro G, Fodor A, Forti F, Fulsom BG. Search for lepton-flavor-violating decays at Belle and Belle II. Journal of High Energy Physics. 2025.
Published In
Journal of High Energy Physics
DOI
EISSN
1029-8479
Publication Date
August 1, 2025
Volume
2025
Issue
8
Related Subject Headings
- Nuclear & Particles Physics
- 5107 Particle and high energy physics
- 5106 Nuclear and plasma physics
- 4902 Mathematical physics
- 0206 Quantum Physics
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
- 0105 Mathematical Physics