Search for lepton flavor-violating decay modes B0 → K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II

A bstract We present the results of a search for the charged-lepton-flavor violating decays B 0 → K *0 τ ± ℓ ∓ , where ℓ ∓ is either an electron or a muon. The results are based on 365 fb − 1 and 711 fb − 1 datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B -tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B 0 → K *0 τ ± ℓ ∓ decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10 − 5 at 90% confidence level.

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Journal
Journal of High Energy Physics
Published
2025-08-22
DOI
https://doi.org/10.1007/jhep08(2025)184
Primary Topic
Particle physics theoretical and experimental studies
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article
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0.00

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article

Search for lepton flavor-violating decay modes B0 → K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II

K. Ravindran, J. Schmitz, E.-J. Jang, T. Lam et al.
Journal of High Energy Physics
Particle physics theoretical and experimental studies
article

Search for lepton flavor-violating decay modes B0 → K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II

K. Ravindran, J. Schmitz, E.-J. Jang, T. Lam, K. Kinoshita, H. Atmacan, S. Bansal, C. Cecchi, T. E. Browder, S. P. Maharana, P. Ecker, S. Pardi, G. Dujany, Z. Gruberová, S.-J. Cho, R. Leboucher, P. Lewis, D. Ricalde Herrmann, M. Alhakami, C. Li, S. Longo, M. Garcia-Hernandez, C. Schwanda, T. Iijima, G. Mancinelli, D. Epifanov, R. Volpe, J. Libby, S. Marcello, M. Maggiora, K. Kumara, W. Gradl, G. Gaudino, M. Kaleta, M. Neu, R. Mizuk, D. Marcantonio, R. Garg, Y.-J. Kwon, Y. B. Li, S. Patra, F. Testa, S. A. Al‐Ghamdi, K. Parham, M. Watanabe, N. K. Baghel, H. Ghumaryan, Н. Акопов, S.-H. Park, H. Bae, Y. Nakazawa, S. Paul, M. E. Sevior, J. Kandra, A. Ishikawa, Shoichi Watanuki, Y. Jin, T. Higuchi, E. Graziani, J. V. Bennett, H. Svidras, A. Sokolov, A. Soffer, S. Moneta, S. Hazra, M. Bračko, G. Raeuber, B. G. Cheon, C. Ketter, H. Aihara, C. Lyu, J. X. Cui, S. A. De La Motte, R. Okubo, M. Masuda, Y. Seino, P. Cheema, A. Beaubien, B. Shwartz, A. Natochii, S. Yamada, Jürgen Becker, S. Bussino, A. Baur, M. Khan, T. Martinov, F. Keil, S. Mitra, T. Bilka, M. Sobotzik, S. Stefkova, S. Korpar, R. Itoh, C. Praz, M. Mirra, C. Sfienti, K. Miyabayashi, P. Kodyš, J. Lin, Q. Y. Liu, E. Ganiev, A. Selce, H. Ono, J. Park, J. Borah, M. Uchida, S. Kohani, A. Di Canto, Y. Liu, J. A. McKenna, T. Kunigo, C. Wessel, A. Frey, A. Sibidanov, J. Baudot, A. Vossen, S. Wallner, S. Sandilya, F. Simon, G. Karyan, R. Maiti, V. Bertacchi, D. Y. Kim, E. Solovieva, R. Mussa, D. Greenwald, R. Manfredi, G. De Pietro, C. Finck, R. Sobie, P. Branchini, M. Aversano, Q. Zhou, S. Jia, F. Le Diberder, M.-Z. Wang, V. Babu, T. Podobnik, V. Aushev, M. J. Lee, T. Lueck, M. Bessner, A. Korobov, V P Jagathy Raj, D. Liventsev, P. Gironella Gironell, M. Remnev, A. Prakash, P. Goldenzweig, S.-K. Choi, A. Bobrov, M. Laurenza, S. Bettarini, P. Jackson, D. Biswas, S. Lin, M. Angelsmark, Z. Doležal, K. Matsuoka, I. Adachi, Y. Yusa, A. Rostomyan, G. Rizzo, P. Urquijo, K. H. Kang, D. Bodrov, N. Anh Ky, T. Fillinger, S. Raiz, G. Inguglia, M. Bertemes, S. Nishida, K. Gudkova, Q. P. Ji, C.-L. Hsu, P. Leo, A. Aloisio, D. M. Asner, G. Giakoustidis, J.-G. Shiu, S. Prell, R. Godang, Y. Li, M. Hoek, P. Feichtinger, K.-H. Kim, L. K. Li, H. Park, M. Barrett, M. Campajola, A. Kuzmin, I. Ripp-Baudot, J. Dingfelder, R. Pestotnik, S. Schneider, R. de Sangro, K. R. Amos, K. Chilikin, W. B. Yan, X. Dong, C. Hearty, I. Tsaklidis, M. Schnepf, M. Nayak, R. Giordano, A. Martens, P. Stavroulakis, T. V. Dong, B. Bhuyan, I. Ueda, M. Destefanis, K. E. Varvell, A. Boschetti, M. Reif, E. Kovalenko, K. Kojima, M. Hernández Villanueva, V. Vobbilisetti, S. Choudhury, T. Shillington, Y. Unno, D. Shtol, L. Cao, S. Bahinipati, R. Tiwary, J. Serrano, R. A. Briere, C. Miller, P. Rados, G. Finocchiaro, M. Takizawa, M. Sumihama, K. Uno, A. Vinokurova, W. W. Jacobs, M. Iwasaki, Y.B Li, M. Naruki, C. Kiesling, Kiyoshi Tanida, H. J. Li, T. Uglov, K. Schoenning, P. Bambade, C. Mariñas, M. Dorigo, A. Budano, D. Matvienko, K. Senyo, M. Veronesi, A. Giri, R. Kowalewski, B. Yabsley, H. Hayashii, L. Corona, R. van Tonder, K. Lalwani, W. Shan, P. Krokovny, T. Humair, K. Unger, P. Horak, L. Šantelj, B. Spruck, J. Chin, G. de Marino, F. F. Trantou, A. Johnson, H.-E. Cho, I. Nakamura, K. Cho, E. Prencipe, M.-C. Chang, L. Vitale, R. Mussa, M. Hohmann, V. Zhilich, K. Yi, H. Purwar, A. Passeri, O. Tittel, L. Reuter, J. S. Zhou, J. H. Yin, M. T. Hedges, F. Tenchini, F. U. Bernlochner, J.-Y. Kim, N. Ipsita, N. Rout, L. Zani, V. S. Vismaya, S. Uno, T. Koga, B. G. Fulsom, A. Gellrich, B. Scavino, M. Mantovano, M. T. Prim, F. Forti, S. Reiter, R. Ayad, R. Farkas, S. Spataro, V. Savinov, F. Becherer, G. B. Mohanty, A. Gaz, I. Haide, A. Heidelbach, D. Meleshko, G. Heine, I. Prudiiev, R. Kumar, I. Heredia-De La Cruz, F. Bianchi, D. Kumar, Boyang Zhang, B. Gobbo, Zhiqing Liu, F. Meier, E. Torassa, O. Gogota, M. Nakao, L. Massaccesi, V. Lisovskyi, E. Bertholet, L. Zhu, M. H. Liu, S. B. Yang, X. Shi, C. Schmitt, J. Skorupa, Y. Sue, I. Domínguez Jiménez, D. Ghosh, Y. P. Liao, D. Jacobi, J. Yuan, L. E. Piilonen, V. Gautam, K. Inami, M. Merola, G. Casarosa, A. Warburton, V. Gaur, T. Ferber, C. Martellini, E. Manoni, E. De La Cruz–Burelo, R. Žlebčík, M. Starič, M. Zeyrek, K. Yoshihara, T. S. Lau, C. Santos, A. Gale, S. Banerjee, J. U. Rehman, Y. H. Ahn, A. Bożek, K. Trabelsi, G. Schnell, G. Pakhlova, Y. Ushiroda, Z. Natkaniec, R. Stroili, J. M. Roney, P. Križan, M. Maushart, C. Madaan, S. H. Robertson, C. Antonioli, I. Consigny
article en

Abstract

A bstract We present the results of a search for the charged-lepton-flavor violating decays B 0 → K *0 τ ± ℓ ∓ , where ℓ ∓ is either an electron or a muon. The results are based on 365 fb − 1 and 711 fb − 1 datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B -tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B 0 → K *0 τ ± ℓ ∓ decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10 − 5 at 90% confidence level.

Journal of High Energy PhysicsVol. 2025(8)
Twitter (United States) (US), University of Hawaiʻi at Mānoa (US), University of Hawaii System (US), High Energy Accelerator Research Organization (JP), Korea Electric Power Corporation (South Korea) (KR), Centre de physique des particules de Marseille (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), The University of Osaka (JP)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Univerzita Karlova v Praze, Grantová Agentura, Univerzita Karlova, Canarie, University of Tabuk, Vietnam Academy of Science and Technology, Thailand Center of Excellence in Physics, Compute Canada, National Research Foundation of Ukraine, European Commission, National Research Foundation, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Grantová Agentura České Republiky, Bundesministerium für Bildung und Forschung, King Saud University, Austrian Science Fund, Generalitat Valenciana, Korea Institute of Science and Technology, Korea Institute of Science and Technology Information, Ikerbasque, Basque Foundation for Science, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Javna Agencija za Raziskovalno Dejavnost RS, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Natural Science Foundation of Shandong Province, National Research University Higher School of Economics, Ministry of Education and Science of Ukraine, Ministry of Science and Higher Education of the Russian Federation, Istituto Nazionale di Fisica Nucleare, Bundesministerium für Bildung, Wissenschaft und Forschung, National Science and Technology Council, Korea Research Environment Open Network, Natural Sciences and Engineering Research Council of Canada, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Akademi Sains Malaysia, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Institut National de Physique Nucléaire et de Physique des Particules, Pacific Northwest National Laboratory
Openalex Percentile: Top 91%
Particle physics theoretical and experimental studies
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