Search for B0 →τ±∓ (ℓ=e, μ) with a hadronic tagging method at Belle SEARCH for B0 →τ±∓ (ℓ=e, μ) with A ... H. ATMACAN et al.

H Atmacan; AJ Schwartz; K Kinoshita; I Adachi; K Adamczyk; H Aihara; S Al Said; DM Asner; V Aulchenko; T Aushev; R Ayad; V Babu; S Bahinipati; M Bauer; P Behera; K Belous; J Bennett; F Bernlochner; M Bessner; V Bhardwaj; B Bhuyan; T Bilka; J Biswal; A Bobrov; A Bozek; M Bračko; P Branchini; TE Browder; A Budano; M Campajola; L Cao; D Červenkov; MC Chang; P Chang; V Chekelian; A Chen; BG Cheon; K Chilikin; HE Cho; K Cho; SK Choi; Y Choi; S Choudhury; D Cinabro; S Cunliffe; S Das; N Dash; G De Nardo; G De Pietro; R Dhamija; F Di Capua; J Dingfelder; Z DoleŽal; TV Dong; S Dubey; D Epifanov; T Ferber; D Ferlewicz; A Frey; BG Fulsom; R Garg; V Gaur; N Gabyshev; A Garmash; A Giri; P Goldenzweig; E Graziani; D Greenwald; T Gu; Y Guan; K Gudkova; C Hadjivasiliou; S Halder; T Hara; O Hartbrich; K Hayasaka; H Hayashii; WS Hou; CL Hsu; K Inami; G Inguglia; A Ishikawa; R Itoh; M Iwasaki; Y Iwasaki; WW Jacobs; S Jia; Y Jin; KK Joo; AB Kaliyar; KH Kang; Y Kato; T Kawasaki; C Kiesling; CH Kim; DY Kim; KH Kim; SH Kim; YK Kim; P Kodyš

Journal article

Search for B0 →τ±∓ (ℓ=e, μ) with a hadronic tagging method at Belle SEARCH for B0 →τ±∓ (ℓ=e, μ) with A ... H. ATMACAN et al.

H Atmacan, AJ Schwartz, K Kinoshita, I Adachi, K Adamczyk, H Aihara, S Al Said, DM Asner, V Aulchenko, T Aushev, R Ayad, V Babu, S Bahinipati, M Bauer, P Behera, K Belous, J Bennett, F Bernlochner, M Bessner, V Bhardwaj Show all

Physical Review D | Published : 2021

DOI: 10.1103/PhysRevD.104.L091105

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Abstract

We present a search for the lepton-flavor-violating decays B0→τ±∓, where ℓ=(e,μ), using the full data sample of 772×106 BB¯ pairs recorded by the Belle detector at the KEKB asymmetric-energy e+e- collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode. The τ± lepton is reconstructed indirectly using the momentum of the reconstructed B and that of the ∓ from the signal decay. We find no evidence for B0→τ±∓ decays and set upper limits on their branching fractions at 90% confidence level of B(B0→τ±μ∓)<1.5×10-5 and B(B0→τ±e∓)<1.6×10-5.

University of Melbourne Researchers

Martin Sevior Author

Eiasha Waheed Author

Phillip Urquijo Author

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Funding Acknowledgements

We thank the KEKB group for the excellent operation of the accelerator; the KEK cryogenics group for the efficient operation of the solenoid; and the KEK computer group, and the Pacific Northwest National Laboratory (PNNL) Environmental Molecular Sciences Laboratory (EMSL) computing group for strong computing support; and the National Institute of Informatics, and Science Information NETwork 5 (SINET5) for valuable network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, the Japan Society for the Promotion of Science (JSPS) , and the Tau-Lepton Physics Research Center of Nagoya University; the Australian Research Council including Grants No. DP180102629, No. DP170102389, No. DP170102204, No. DP150103061, and No. FT130100303; Austrian Federal Ministry of Education, Science and Research (FWF) and FWF Austrian Science Fund No. P 31361-N36; the National Natural Science Foundation of China under Contracts No. 11435013, No. 11475187, No. 11521505, No. 11575017, No. 11675166, and No. 11705209; Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) , Grant No. QYZDJ-SSW-SLH011; the CAS Center for Excellence in Particle Physics (CCEPP) ; the Shanghai Pujiang Program under Grant No. 18PJ1401000; the Shanghai Science and Technology Committee (STCSM) under Grant No. 19ZR1403000; the Ministry of Education, Youth and Sports of the Czech Republic under Contract No. LTT17020; Horizon 2020 ERC Advanced Grant No. 884719 and ERC Starting Grant No. 947006"InterLeptons" (European Union) ; the Carl Zeiss Foundation, the Deutsche Forschungsgemeinschaft, the Excellence Cluster Universe, and the Volkswagen-Stiftung; LInstitut National de Physique Nuclaire et de Physique des Particules (IN2P3) du CNRS (France) ; the Department of Atomic Energy (Project Identifi-cation No. RTI 4002) and the Department of Science and Technology of India; the Istituto Nazionale di Fisica Nucleare of Italy; National Research Foundation (NRF) of Korea Grants No. 2016R1D1A1B01010135, No. 2016R1D1A1B02012900, No. 2018R1A2B3003643, No. 2018R1A6A1A06024970, No. 2018R1D1A1B07047294, No. 2019K1A3A7A09033840, and No. 2019R1I1A3A01058933; Radiation Science Research Institute, Foreign Large-size Research Facility Application Supporting project, the Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information and KREONET/GLORIAD; the Polish Ministry of Science and Higher Education and the National Science Center; the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 14.W03.31.0026, and the HSE University Basic Research Program, Moscow; University of Tabuk research Grants No. S-1440-0321, No. S-0256-1438, and No. S-0280-1439 (Saudi Arabia) ; the Slovenian Research Agency Grants No. J1-9124 and No. P1-0135; Ikerbasque, Basque Foundation for Science, Spain; the Swiss National Science Foundation; the Ministry of Education and the Ministry of Science and Technology of Taiwan; and the United States Department of Energy and the National Science Foundation.