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Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II

Publication ,  Journal Article
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
December 22, 2025

We present the result of a search for the charged-lepton-flavor violating decays , where is a muon or an electron, using a data sample with an integrated luminosity of 428 fb recorded by the Belle II experiment at the SuperKEKB collider. The selection of events containing a signal candidate is based on an inclusive-tagging reconstruction and on a boosted decision tree to suppress background. Upper limits on the branching fractions between 1.3 and 2.5 × 10 are set at the 90% confidence level. These results are the most stringent bounds to date for four of the modes.

Duke Scholars

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

December 22, 2025

Volume

2025

Issue

12

Publisher

Springer Science and Business Media LLC

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., … Žlebčík, R. (2025). Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II. Journal of High Energy Physics, 2025(12). https://doi.org/10.1007/jhep12(2025)169
Adachi, I., L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, et al. “Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II.” Journal of High Energy Physics 2025, no. 12 (December 22, 2025). https://doi.org/10.1007/jhep12(2025)169.
Adachi I, Aggarwal L, Ahmed H, Ahn Y, Aihara H, Akopov N, et al. Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II. Journal of High Energy Physics. 2025 Dec 22;2025(12).
Adachi, I., et al. “Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II.” Journal of High Energy Physics, vol. 2025, no. 12, Springer Science and Business Media LLC, Dec. 2025. Crossref, doi:10.1007/jhep12(2025)169.
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, Bae H, Baghel NK, Bahinipati S, Bambade P, Banerjee S, Bansal 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, Bhardwaj V, Bhuyan B, Bianchi F, Bilka T, Biswas D, Bobrov A, Bodrov D, Bondar A, Bonvicini G, Borah J, Boschetti A, Bozek A, Bračko M, Branchini P, Brenny N, Browder TE, Budano A, Bussino S, Campagna Q, Campajola M, Cao L, Casarosa G, Cecchi C, Chang M-C, Cheaib R, Cheema P, Chen C, Chen L, Cheon BG, Chilikin K, Chin J, Chirapatpimol K, Cho H-E, Cho K, Cho S-J, Choi S-K, Choudhury S, Cochran J, Consigny I, Corona L, Cui JX, De La Cruz-Burelo E, De La Motte SA, De Nardo G, De Pietro G, de Sangro R, Destefanis M, Dey S, Di Canto A, Di Capua F, Dingfelder J, Doležal Z, Domínguez Jiménez I, Dong TV, Dong X, Dorigo M, Dugic K, Dujany G, Ecker P, Epifanov D, Eppelt J, Farkas R, Feichtinger P, Ferber T, Fillinger T, Finck C, Finocchiaro G, Fodor A, Forti F, Frey A, Fulsom BG, Gabrielli A, Gale A, Ganiev E, Garcia-Hernandez M, Garg R, Gaudino G, Gaur V, Gautam V, Gaz A, Gellrich A, Ghevondyan G, Ghosh D, Ghumaryan H, Giakoustidis G, Giordano R, Giri A, Gironella Gironell P, Glazov A, Gobbo B, Godang R, Gogota O, Goldenzweig P, Gradl W, Graziani E, Greenwald D, Gruberová Z, Guan Y, Gudkova K, Haide I, Han Y, Hara T, Harris C, Hayasaka K, Hayashii H, Hazra S, Hearty C, Hedges MT, Heidelbach A, Heine G, Heredia de la Cruz I, Hernández Villanueva M, Higuchi T, Hoek M, Hohmann M, Hoppe R, Horak P, Hsu C-L, Iijima T, Inami K, Inguglia G, Ipsita N, Ishikawa A, Itoh R, Iwasaki M, Jackson P, Jacobi D, Jacobs WW, Jaffe DE, Jang E-J, Ji QP, Jia S, Jin Y, Johnson A, Joo KK, Junkerkalefeld H, Kalita D, Kaliyar AB, Kandra J, Kang KH, Karyan G, Kawasaki T, Keil F, Ketter C, Khan M, Kiesling C, Kim C-H, Kim DY, Kim J-Y, Kim K-H, Kim YJ, Kim Y-K, Kindo H, Kinoshita K, Kodyš P, Koga T, Kohani S, Kojima K, Korobov A, Korpar S, Kovalenko E, Kowalewski R, Križan P, Krokovny P, Kuhr T, Kulii Y, Kumar D, Kumar J, Kumar R, Kumara K, Kunigo T, Kuzmin A, Kwon Y-J, Lacaprara S, Lalwani K, Lam T, Lanceri L, Lange JS, Lau TS, Laurenza M, Leboucher R, Le Diberder FR, Lee MJ, Lemettais C, Leo P, Lewis PM, Li H-J, Li LK, Li QM, Li SX, Li WZ, Li Y, Li YB, Liao YP, Libby J, Lin J, Lin S, Lisovskyi V, Liu MH, Liu QY, Liu Y, Liu ZQ, Liventsev D, Longo S, Lueck T, Lyu C, Ma Y, Madaan C, Maggiora M, Maharana SP, Maiti R, Mancinelli G, Manfredi R, Manoni E, Mantovano M, Marcantonio D, Marcello S, Marinas C, Martellini C, Martens A, Martini A, Martinov T, Massaccesi L, Masuda M, Matvienko D, Maurya SK, Maushart M, McKenna JA, Mehta R, Meier F, Meleshko D, Merola M, Miller C, Mirra M, Mitra S, Miyabayashi K, Miyake H, Mizuk R, Mohanty GB, Mondal S, Moneta S, Moreira de Carvalho AL, Moser H-G, Nakamura I, Nakao M, Nakazawa Y, Naruki M, Natkaniec Z, Natochii A, Nayak M, Nazaryan G, Neu M, Nishida S, Ogawa S, Okubo R, Ono H, Onuki Y, Pakhlova G, Panta A, Pardi S, Parham K, Park H, Park J, Park K, Park S-H, Paschen B, Passeri A, Patra S, Paul S, Pedlar TK, Peruzzi I, Peschke R, Pestotnik R, Piccolo M, Piilonen LE, Podesta-Lerma PLM, Podobnik T, Pokharel S, Prakash A, Praz C, Prell S, Prencipe E, Prim MT, Privalov S, Purwar H, Rados P, Raeuber G, Raiz S, Raj V, Ravindran K, Rehman JU, Reif M, Reiter S, Remnev M, Reuter L, Ricalde Herrmann D, Ripp-Baudot I, Rizzo G, Robertson SH, Roney JM, Rostomyan A, Rout N, Salutari L, Sanders DA, Sandilya S, Santelj L, Savinov V, Scavino B, Schmitz J, Schneider S, Schnepf M, Schoenning K, Schwanda C, Schwartz AJ, Seino Y, Selce A, Senyo K, Serrano J, Sevior ME, Sfienti C, Shan W, Sharma G, Shi XD, Shillington T, Shimasaki T, Shiu J-G, Shtol D, Sibidanov A, Simon F, Singh JB, Skorupa J, Sobie RJ, Sobotzik M, Soffer A, Sokolov A, Solovieva E, Song W, Spataro S, Spruck B, Starič M, Stavroulakis P, Stefkova S, Stoetzer L, Stroili R, Sue Y, Sumihama M, Sumisawa K, Suwonjandee N, Svidras H, Takahashi M, Takizawa M, Tamponi U, Tanida K, Tenchini F, Thaller A, Tittel O, Tiwary R, Torassa E, Trabelsi K, Trantou FF, Tsaklidis I, Ueda I, Uglov T, Unger K, Unno Y, Uno K, Uno S, Urquijo P, Ushiroda Y, Vahsen SE, van Tonder R, Varvell KE, Veronesi M, Vinokurova A, Vismaya VS, Vitale L, Vobbilisetti V, Volpe R, Vossen A, Wakai M, Wallner S, Wang M-Z, Wang XL, Warburton A, Watanabe M, Watanuki S, Wessel C, Won E, Xu XP, Yabsley BD, Yamada S, Yan W, Yan WC, Yang SB, Yelton J, Yi K, Yin JH, Yoshihara K, Yuan CZ, Yuan J, Zani L, Zeng F, Zeyrek M, Zhang B, Zhilich V, Zhou JS, Zhou QD, Zhu L, Žlebčík R. Search for the lepton-flavor-violating τ− → e∓ℓ±ℓ− decays at Belle II. Journal of High Energy Physics. Springer Science and Business Media LLC; 2025 Dec 22;2025(12).
Journal cover image

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

December 22, 2025

Volume

2025

Issue

12

Publisher

Springer Science and Business Media LLC

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