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Search for lepton flavor-violating decay modes $B^0\to K_S^0\tau^\pm\ell^\mp~(\ell=\mu, e)$ with hadronic $B$-tagging at Belle and Belle II
Ichiro Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, Hiroaki Aihara, Н. Акопов, M. Alhakami, A. Aloisio, N. Althubiti, Anh-Ky Nguyen, D. M. Asner, H. Atmacan, V. Aushev, M. Aversano, R. Ayad, Varghese Babu, S. Bahinipati, P. Bambade, S. Banerjee, S. Bansal, M. Barrett, J. Baudot, A. Baur, A. Beaubien, F. Becherer, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, V. Bhardwaj, Bipul Bhuyan, F. Bianchi, D. Biswas, A. Bobrov, Denis Bodrov, A. E. Bolz, A. Boschetti, A. Bożek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, Ming-Chuan Chang, P. Chang, R. Cheaib, P. Cheema, B. G. Cheon, K. Chirapatpimol, Haneol Cho, K. Cho, Sung‐Jin Cho, S. K. Choi, J. Cochran, L. Corona, J. X. Cui, E. De La Cruz–Burelo, S. A. De La Motte, G. de Marino, Guglielmo De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. Di Canto, F. Di Capua, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, Xu Dong, M. Dorigo, D. Dossett, K. Dugic, G. Dujany, P. Ecker, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, B. G. Fulsom, A. Gabrielli, E. Ganiev, Marcela Garcia Hernandez, Renu Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, Pere Gironella Gironella, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, Wolfgang Gradl, Svenja Katharina Granderath, E. Graziani, D. Greenwald, Zuzana Gruberova, Yinghui Guan, Kristina Gudkova, I. Haide, Y. Han, Takanori Hara, C. Harris, K. Hayasaka, H. Hayashii, Sagar Hazra, C. Hearty, Michael Thomas Hedges, A. Heidelbach, I. Heredia-De La Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, Marcel Hohmann, Philipp Horak, C.-L. Hsu, T. Humair, Toru Iijima, K. Inami, G. Inguglia, A. Ishikawa, Ryosuke Itoh, M. Iwasaki, D. Jacobi, William Wescott Jacobs, D. E. Jaffe, Eunji Jang, Q. P. Ji, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, Mateusz Jakub Kaleta, A. B. Kaliyar, J. Kandra, K. H. Kang, Shuaiyan Kang, G. Karyan, T. Kawasaki, Felix Keil, C. Ketter, C. Kiesling, Doris Yangsoo Kim, Jae-Young Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, T. Koga, S. Kohani, K. Kojima, Samo Korpar, E. Kovalenko, R. Kowalewski, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, Devender Kumar, Rajeev Kumar, Kospalage Janaka Kumara, Takuto Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, Y.-T. Lai, K. Lalwani, Tommy Lam, L. Lanceri, J. S. Lange, Tak Shun Lau, M. Laurenza, R. Leboucher, Francois Rene Le Diberder, M. J. Lee, C. Lemettais, Paolo Leo, Chunhua Li, L. K. Li, Qiming Li, Wenzhe Li, Yang Li, Yubo Li, Yipu Liao, J. Libby, Shu-Ping Lin, Meihong Liu, Yu-xin Liu, Zhiqing Liu, D. Liventsev, S. Longo, T. Lueck, T. Luo, C. Lyu, Yue Ma, C. Madaan, M. Maggiora, S. P. Maharana, R. Maiti, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, S. Marcello, C. Mariñas, C. Martellini, A. Martens, A. Martini, Tommy Martinov, L. Massaccesi, Masataka Masuda, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, D. Meleshko, M. Merola, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, H. Miyake, G. B. Mohanty, S. Mondal, S. Moneta, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, Y. Nakazawa, M. Naruki, Z. Natkaniec, A. Natochii, M. Nayak, M. Neu, S. Nishida, Hiroaki Ono, Yoshiyuki Onuki, F. Otani, Galina Pakhlova, E. Paoloni, S. Pardi, H. Park, J. Park, K. Park, S.-H. Park, B. Paschen, A. Passeri, S. Patra, T. K. Pedlar, I. M. Peruzzi, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, Pedro Luis Manuel Podesta Lerma, T. Podobnik, C. Praz, S. Prell, E. Prencipe, M. T. Prim, I. Prudiiev, H. Purwar, P. Rados, G. Raeuber, S. Raiz, J. U. Rehman, M. Reif, S. Reiter, L. Reuter, Daniel Enrique Ricalde Herrmann, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Röhrken, John Michael Roney, A. Rostomyan, N. Rout, D. A. Sanders, S. Sandilya, L. Šantelj, V. Savinov, B. Scavino, Simon Schneider, G. Schnell, C. Schwanda, Yoshiaki Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, Chanchal Sharma, Xiaodong Shi, T. Shillington, T. Shimasaki, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, M. Starič, P. Stavroulakis, S. Stefkova, J. Strube, Y. Sue, M. Sumihama, K. Sumisawa, W. Sutcliffe, N. Suwonjandee, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, E. Torassa, Karim Trabelsi, I. Tsaklidis, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, Sven Einar Vahsen, R. van Tonder, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, Vidya Sagar Vobbilisetti, R. Volpe, Miho Wakai, S. Wallner, Zihan Wang, A. Warburton, Minori Watanabe, Shun Watanuki, C. Wessel, J. Wiechczynski, E. Won, Xinping Xu, B. Yabsley, S. Yamada, J. Yelton, J. H. Yin, Keisuke Yoshihara, C. Z. Yuan, Jing Yuan, L. Zani, Boyang Zhang, Jianshe Zhou, L. Zhu, V. Zhukova, R. Žlebčík
Bibliographic record
VenuearXiv (Cornell University) · 2024
Typepreprint
Languageen
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsnot available
FundersPacific Northwest National LaboratoryInstitut National de Physique Nucléaire et de Physique des ParticulesAkademi Sains MalaysiaJapan Society for the Promotion of ScienceNatural Sciences and Engineering Research Council of CanadaKorea Research Environment Open NetworkCentro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalIstituto Nazionale di Fisica NucleareMinistry of Science and Higher Education of the Russian FederationNational Research University Higher School of EconomicsKnut och Alice Wallenbergs StiftelseNational Science and Technology CouncilIkerbasque, Basque Foundation for ScienceNational Research FoundationAustrian Science FundDeutsches Elektronen-SynchrotronThailand Center of Excellence in PhysicsGeneralitat ValencianaKing Saud UniversityU.S. Department of EnergyNational Natural Science Foundation of ChinaJavna Agencija za Raziskovalno Dejavnost RSSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungKorea Institute of Science and Technology InformationMinistry of Education, Culture, Sports, Science and TechnologyDeutsche ForschungsgemeinschaftMax-Planck-GesellschaftNational Research Foundation of UkraineGrantová Agentura České RepublikyAlexander von Humboldt-StiftungBundesministerium für Bildung, Wissenschaft und ForschungMinistry of Education and Science of UkraineVietnam Academy of Science and TechnologyNatural Science Foundation of Shandong ProvinceCompute CanadaUniversity of TabukNational Science FoundationKorea Institute of Science and TechnologyBundesministerium für Bildung und ForschungCanarieTürkiye Bilimsel ve Teknolojik Araştırma KurumuAgence Nationale de la RechercheGrantová Agentura, Univerzita KarlovaCentre National de la Recherche ScientifiqueUniverzita Karlova v PrazeMinisterio de Ciencia e InnovaciónEuropean Commission
KeywordsPhysicsLeptonParticle physicsHadronB mesonBranching fractionMesonNuclear physicsElectron–positron annihilationElectron
Abstract
We present the first search for the lepton flavor-violating decay modes $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp~(\ell=\mu, e)$ using the 711 fb$^{-1}$ and 365 fb$^{-1}$ data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic $B$-tagging technique, and search for the signal decay in the system recoiling against the fully reconstructed $B$ meson. We find no evidence for $B^0 \rightarrow K_S^0 \tau^\pm \ell^\mp$ decays and set 90% confidence level upper limits on the branching fractions in the range of $[0.8,\,3.6]\times10^{-5}$.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.001
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.003
Threshold uncertainty score0.011
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
Opus teacher head0.043
GPT teacher head0.216
Teacher spread0.173 · how far apart the two teachers sit on this one work
Validation status
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".
Quick stats
Citations0
Published2024
Admission routes1
Has abstractyes