Search for the Decay B + → K + τ + τ − Using Data from the Belle and Belle II Experiments
Year: 2026
Type: article
Abstract: We report a search for the rare decay B^{+}→K^{+}τ^{+}τ^{-} using 1.2×10^{9} ϒ(4S) mesons produced near threshold in electron-positron collisions and collected by the Belle and Belle II experiments. We fully reconstruct the hadronic decay of one B meson produced in the ϒ(4S)→B^{+}B^{-} decay, and search for B^{±}→K^{±}τ^{+}τ^{-} candidates among the remaining collision products, reconstructing a charged kaon and leptonic decays of the τ leptons. We optimize the selection for best sensitivity and look for an excess over background at low values of the residual energy detected in the calorimeter after full event reconstruction. We observe no significant excess and set the limit B(B^{+}→K^{+}τ^{+}τ^{-})<0.56×10^{-3} at the 90% confidence level, improving on the only previous result by a factor of four.
Source: Physical Review Letters
DOI: 10.1103/12f4-z51q
Authors: M. Abumusabh, I. Adachi, K. Adamczyk, A. Aggarwal, L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, M. Alhakami, A. Aloisio, N. Althubiti, K. Amos, M. Angelsmark, N. Anh Ky, C. Antonioli, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, H. Bae, N. K. Baghel, S. Bahinipati, P. Bambade, Sw. Banerjee, M. Barrett, M. Bartl, J. Baudot, A. Baur, A. Beaubien, F. Becherer, J. Becker, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, V. Bhardwaj, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bondar, G. Bonvicini, J. Borah, A. Boschetti, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, M.-C. Chang, P. Chang, P. Cheema, L. Chen, B. G. Cheon, C. Cheshta, H. Chetri, K. Chilikin, K. Chirapatpimol, H.-E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, S. Choudhury, S. Chutia, J. Cochran, J. A. Colorado-Caicedo, I. Consigny, L. Corona, J. X. Cui, E. De La Cruz-Burelo, S. A. De La Motte, G. de Marino, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhayal, A. Di Canto, J. Dingfelder, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, X. Dong, M. Dorigo, K. Dugic, G. Dujany, P. Ecker, J. Eppelt, R. Farkas, T. Ferber, T. Fillinger, C. Finck, G. Finocchiaro, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, A. Gale, E. Ganiev, M. Garcia-Hernandez, R. Garg, L. Gärtner, G. Gaudino, V. Gaur, V. Gautam, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, R. Giordano, A. Giri, P. Gironella Gironell, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, E. Graziani, D. Greenwald, Y. Guan, K. Gudkova, I. Haide, H. Haigh, Y. Han, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, G. Heine, I. Heredia de la Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, R. Hoppe, P. Horak, X. T. Hou, C.-L. Hsu, T. Humair, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, D. Jacobi, W. W. Jacobs, E.-J. Jang, Q. P. Ji, S. Jia, Y. Jin, A. Johnson, J. Kandra, K. H. Kang, S. Kang, G. Karyan, F. Keil, C. Ketter, C. Kiesling, C. Kim, D. Y. Kim, H. Kim, J.-Y. Kim, K.-H. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, P. Križan, P. Krokovny, T. Kuhr, Y. Kulii, D. Kumar, J. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, T. Lam, L. Lanceri, J. S. Lange, T. S. Lau, M. Laurenza, R. Leboucher, F. R. Le Diberder, H. Lee, M. J. Lee, C. Lemettais, P. Leo, P. M. Lewis, C. Li, H.-J. Li, L. K. Li, Q. M. Li, W. Z. Li, Y. Li, Y. B. Li, Y. P. Liao, J. Libby, J. Lin, S. Lin, Z. Liptak, V. Lisovskyi, M. H. Liu, Q. Y. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, A. Lozar, T. Lueck, C. Lyu, J. L. Ma, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, M. Marfoli, C. Marinas, C. Martellini, A. Martens, T. Martinov, L. Massaccesi, M. Masuda, D. Matvienko, S. K. Maurya, M. Maushart, J. A. McKenna, Z. Mediankin Gruberová, R. Mehta, F. Meier, D. Meleshko, M. Merola, C. Miller, M. Mirra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, S. Moneta, A. L. Moreira de Carvalho, H.-G. Moser, Th. Muller, R. Mussa, I. Nakamura, M. Nakao, Y. Nakazawa, M. Naruki, Z. Natkaniec, A. Natochii, M. Nayak, M. Neu, M. Niiyama, S. Nishida, R. Nomaru, S. Ogawa, R. Okubo, H. Ono, Y. Onuki, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, K. Parham, J. Park, K. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, M. Piccolo, L. E. Piilonen, P. L. M. Podesta-Lerma, T. Podobnik, A. Prakash, C. Praz, S. Prell, E. Prencipe, M. T. Prim, S. Privalov, I. Prudiiev, H. Purwar, P. Rados, S. Raiz, K. Ravindran, J. U. Rehman, M. Reif, S. Reiter, L. Reuter, D. Ricalde Herrmann, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, J. M. Roney, A. Rostomyan, N. Rout, S. Saha, L. Salutari, D. A. Sanders, S. Sandilya, L. Santelj, C. Santos, V. Savinov, B. Scavino, C. Schmitt, S. Schneider, G. Schnell, K. Schoenning, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, G. Sharma, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J.-G. Shiu, D. Shtol, B. Shwartz, A. Sibidanov, F. Simon, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, W. Song, S. Spataro, K. Špenko, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, J. Strube, M. Sumihama, N. Suwonjandee, M. Takahashi, M. Takizawa, S. S. Tang, K. Tanida, F. Tenchini, F. Testa, A. Thaller, T. Tien Manh, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, F. F. Trantou, I. Tsaklidis, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. van Tonder, K. E. Varvell, M. Veronesi, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, M. Wakai, S. Wallner, M.-Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, W. Yan, W. Yan, J. Yelton, K. Yi, J. H. Yin, K. Yoshihara, J. Yuan, Y. Yusa, L. Zani, F. Zeng, M. Zeyrek, B. Zhang, V. Zhilich, J. S. Zhou, Q. D. Zhou, L. Zhu, R. Žlebčík
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
Funders: National Science and Technology Council, National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Univerzita Karlova v Praze, Grantová Agentura, Univerzita Karlova, University of Victoria, University of Tabuk, Ministry of Education, Secretaría de Educación Pública, Vietnam Academy of Science and Technology, Thailand Center of Excellence in Physics, Istituto Nazionale di Fisica Nucleare Sezione di Padova, University of Petroleum and Energy Studies, National Research Foundation of Ukraine, Canada Foundation for Innovation, European Commission, National Research Foundation, Department of Science and Technology, Ministry of Science and Technology, India, Department of Atomic Energy, Government of India, Helmholtz-Gemeinschaft, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, United States-Israel Binational Science Foundation, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, King Saud University, Austrian Science Fund, Generalitat Valenciana, Korea Institute of Science and Technology Information, National Research Foundation of Korea, Israel Science Foundation, Ikerbasque, Basque Foundation for Science, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Narodowe Centrum Nauki, Javna Agencija za Raziskovalno Dejavnost RS, Universiti Malaya, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Ministerstwo Edukacji i Nauki, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Ministry of Science and Technology, Israel, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, High Energy Accelerator Research Organization, 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, National Institute of Informatics, Istituto Nazionale di Fisica Nucleare, Bundesministerium für Bildung, Wissenschaft und Forschung, Kementerian Pendidikan Malaysia, National Science and Technology Council, Alliance de recherche numérique du Canada, Korea Research Environment Open Network, Seventh Framework Programme, HORIZON EUROPE Framework Programme, Natural Sciences and Engineering Research Council of Canada, European Research Council, Australian Research Council, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Akademi Sains Malaysia, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Agencia Estatal de Investigación, National Key Research and Development Program of China, Institut National de Physique Nucléaire et de Physique des Particules, H2020 European Research Council, H2020 Marie Skłodowska-Curie Actions, Pacific Northwest National Laboratory, NextGenerationEU
Awards: G1049003178, Effective Theories for Strong Interactions: Precision Tools to Meet Experiment, G1118820997, G1138632649, NEUTRINO CROSS SECTIONS: FOUNDATIONS OF THE FUTURE, NEw Physics searches with tAu Leptons, G1292439221, A search for new interactions at Belle II using leptons, G1446753731, G1466111314, G1490384003, G1509888190, Non-Leptonic Three-Body B Decays: Theory and Phenomenology, G1842629209, G1871341476, G1913364353, G1935710221, G1939714876, G196419191, G1996771453, Search for New Physics by Global Analysis, G2029582843, G2076608, G2297643115, G2366539284, G241279073, Non-Leptonic Three-Body B Decays: Theory and Phenomenology, 地盤の耐震応答に関する基礎動力学的研究, G2434243792, RUI: Studies of Heavy Quarkonium Spectroscopy with Belle and Belle II, G2522279099, Search for physics beyond the Standard Model by studying lepton universality in B meson decays, G2583900436, G2668241615, RESEARCH IN HIGH ENERGY PHYSICS AT DUKE UNIVERSITY, A state-of-the-art pulsar survey to aid gravitational wave detection efforts through pulsar timing, SEARCHES FOR NEW PHYSICS IN THE STANDARD MODEL PROCESSES AT THE INTENSITY FRONTIER: BELLE II, Flavour Anomalies with advanced particle Identification MEthods, Search for the Lepton Flavour Violating Decay Tau to Lepton + Gamma at the Belle II Experiment, G3000074094, G3046200081, EXPERIMENTAL NEUTRINO PHYSICS, G3136143680, G3234280719, Study of the structure for tau lepton flavor on Belle II, RESEARCH IN HIGH ENERGY PHYSICS, G326497735, A novel approach to meson or lepton decays to escaping particles, G3348048606, G3358600294, Enabling the Future of the Australian Collider Physics Program, Experimental Nuclear Physics and Fundamental Interactions at Indiana University, G3614130489, G3614640056, G3701425527, Investigation of New Physics via matter-antimatter asymmetries, G3775766869, G3820349873, G387734, キャビティショントラックチェンバー(超音波泡箱)の研究, Japan and Europe Network for Neutrino and Intensity Frontier Experimental Research 2, G4045687426, G405252872, G405563145, G4130209420, G4272034983, Search for the Lepton Flavour Violating Decay Tau to Lepton + Gamma at the Belle II Experiment, G4379173793, オルガノボラン(有機ほう素化合物)を用いる新しい有機合成に関する研究, Quark-hadron duality in B meson semileptonic decays, G466842207, G4673483196, G4716474093, G4737675266, Road toward the next standard model explored with muon precision physics, G4805177507, G4879365968, G4944932581, G4974551872, G5170186115, G5232368275, G5259210140, G5273183856, G5321654564, G5407126004, G545007060, Experimental Particle Physics, G5596435803, G5600723653, G5629441754, G5633341255, G5671187699, 赤芽球フェリチンの構造と機能に関する研究, Light new particles at electron-positron colliders, STUDIES IN ELEMENTARY PARTICLE PHYSICS, G5765906131, G5831461947, G5838019525, G5954829367, G5988284195, G608581630, Collaborative Research: Dynamic Vegetation Feedback and Regional Climate Predictions in West Africa, G6507815512, Experimental test of lepton universality and improvements of particle identification at the Belle II experiment, Multi-messenger particle physics: Hunting for Leptoquarks, RESEARCH IN EXPERIMENTAL AND THEORETICAL HIGH ENERGY PHYSICS, SEARCHES FOR LEPTON FLAVOR VIOLATION AND DARK MATTER AT THE INTENSITY FRONTIER, Probing New Physics with Tau-Lepton, Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment, G6830938910, Charmingly Direct CP Violation, G6915156049, G698819318, G7032149085, G7080048889, G7095037090, G7145191310, StrangeCharm: Precision study of strange-charm baryons, G7198535790, G7200992521, INTENSITY FRONTIER STUDIES AT THE UNIVERSITY OF MISSISSIPPI, Fundamental aspects of new physics search in precision spectroscopy, G758284975, G7586236497, G7692396955, Search for New Symmetry Violation in Leptons, G7848300060, Search for new physics by researching lepton universality with B and Y(2S) meson decays, Enabling the future of the Australian collider physics program, Determination of -Vcb- from exclusive B decays at Belle II, G7900824704, REU Site: Grand Valley State University Summer Undergraduate Research Program in Mathematics, 体温調節機構の性分化メカニズムの解析, G8077167703, Exploration of the particle physics frontier at the Super B-factory and cultivation o f young researchers, Top quark mass and Yukawa coupling determinations at ILC, G8099446405, G811852815, Measurement of Vcb in inclusive B decays at Belle II, G8140083606, Test of lepton universality in bottomonium decays, Precise measurement of muonium HFS for new physics search hunting, PARTICLE PHYSICS RESEARCH PROGRAM, G8363112480, NOVEL EXPERIMENTAL PROBES OF QCD IN SIDIS AND E+E- ANNIHILATION, CP VIOLATION SEARCHES AND DISTRIBUTED COMPUTING DEVELOPMENT WITH THE BELLE II EXPERIMENT AT THE UNIVERSITY OF MISSISSIPPI AND BROOKHAVEN NATIONAL LAB, G8517107566, Searching for New CP Violating Phenomena at the Intensity Frontier, G872144517, G8920660035, Charmingly Radiative CP Violation, G9000132604, G9000229261, G9000236791, G9000354113, G9000845012, Investigation of the flavor anomaly problem by the world's highest luminosity accelerator experiment, RESEARCH IN PARTICLE THEORY AND EXPERIMENT AT THE UNIVERSITY OF CINCINNATI, World's best sensitivities of new physics searches with Electroweak Penguin B decays and development of light-weight and fast-readout pixel detector
OpenAlex ID: W7165043177