First Measurement of R (Xτ/ℓ) as an Inclusive Test of the b →cτν Anomaly

I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, V. Babu, S. Bahinipati, P. Bambade, Sw Banerjee, S. Bansal, M. Barrett, J. Baudot, A. BaurA. Beaubien, F. Becherer, J. Becker, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M. C. Chang, P. Chang, P. Cheema, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H. E. Cho, K. Cho, S. J. Cho, S. K. Choi, S. Choudhury, L. Corona, L. M. Cremaldi, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Marino, G. De Nardo, M. De Nuccio, G. De Pietro, R. De Sangro, M. Destefanis, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. DoleŽal, T. V. Dong, M. Dorigo, K. Dort, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, K. Gudkova, S. Halder, Y. Han, T. Hara, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia De La Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C. L. Hsu, T. Humair, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, D. E. Jaffe, E. J. Jang, S. Jia, Y. Jin, K. K. Joo, H. Junkerkalefeld, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M.G. Kraetzschmar, P. KriŽan, P. Krokovny, T. Kuhr, Y. Kulii, M. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y. J. Kwon, S. Lacaprara, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, R. Leboucher, F. R. Le Diberder, M. J. Lee, D. Levit, P. M. Lewis, L. K. Li, Y. Li, Y. B. Li, J. Libby, M. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, T. Luo, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, A. C. Manthei, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, T. Martinov, L. Massaccesi, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, M. Mirra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H. G. Moser, M. Mrvar, R. Mussa, I. Nakamura, M. Nakao, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, C. Niebuhr, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, H. Park, S. H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, P. L.M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, P. Rocchetti, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, Y. Sakai, D. A. Sanders, S. Sandilya, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, C. P. Shen, X. D. Shi, T. Shillington, T. Shimasaki, J. G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, K. Sumisawa, H. Svidras, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, Y. Uematsu, 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, A. Vinokurova, V. S. Vismaya, L. Vitale, R. Volpe, B. Wach, M. Wakai, S. Wallner, M. Z. Wang, X. L. Wang, Z. Wang, A. Warburton, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, B. Zhang, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We measure the tau-to-light-lepton ratio of inclusive B-meson branching fractions R(Xτ/ℓ)B(B→Xτν)/B(B→Xℓν), where ℓ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed B meson and a charged lepton candidate from 189 fb-1 of electron-positron collision data collected with the Belle II detector. We find R(Xτ/ℓ)=0.228±0.016(stat)±0.036(syst), in agreement with standard-model expectations. This is the first direct measurement of R(Xτ/ℓ).

Original languageEnglish
Article number211804
JournalPhysical Review Letters
Volume132
Issue number21
DOIs
StatePublished - 24 May 2024

Funding

FundersFunder number
University of Victoria
Narodowe Centrum Nauki
Institut National de Physique Nucléaire et de Physique des Particules
Korea Research Environment Open Network
Akademi Sains Malaysia
Universiti Malaya
National Institute of Informatics
Korea Institute of Science and Technology Information
Bundesministerium für Bildung, Wissenschaft und Forschung
Instituto Nazionale di Fisica Nucleare
Thailand Center of Excellence in Physics
Department of Science and Technology, Ministry of Science and Technology, India
Centre National de la Recherche Scientifique
Max-Planck-Gesellschaft
Bundesministerium für Bildung und Forschung
Ministry of Education and Science of Ukraine
Helmholtz-Gemeinschaft
Canarie
GridKA
Deutsche Forschungsgemeinschaft
Ministry of Education and Science of the Russian Federation
Natural Sciences and Engineering Research Council of Canada
National Science and Technology Council
TUBITAK ULAKBIM
Ministry of Education
National Research University Higher School of Economics
Compute Canada
European Research Council
Ministerstwo Edukacji i Nauki
GLORIAD
Alexander von Humboldt-Stiftung
Ministry of Education, Culture, Sports, Science and Technology
United States-Israel Binational Science Foundation2016113
United States-Israel Binational Science Foundation
National Science FoundationPHY-2111604, PHY-1913789
National Science Foundation
Vietnam Academy of Science and TechnologyDL0000.02/24-25, NVCC.05.12/22-23
Vietnam Academy of Science and Technology
National Research Foundation of Korea2022R1A2C1003993, 2016R1D1A1B02012900, 2018R1A2B3003643, 2021R1F1A1064008, 2021R1A6A1A03043957, RS-2022-00197659, 2019R1I1A3A01058933, 2021R1F1A1060423, 2018R1A6A1A06024970
National Research Foundation of Korea
National Natural Science Foundation of China and Research12175041, 12135005, 11761141009, 11975076, 11575017, 12150004, 12161141008, 11705209
Grantová Agentura, Univerzita Karlova246122
Grantová Agentura, Univerzita Karlova
UPES SEEDD-SOE/20062022/06, D-SEED-INFRA/17052023/01
Slovenian Research Agency and ResearchJ1-9124, P1-0135
Australian Research CouncilDP210101900, DP210102831, DP200101792, DE220100462, LE210100098, LE230100085
Australian Research Council
Horizon 2020 Marie Sklodowska-Curie700525, 822070, 101026516
Higher Education and Science Committee of the Republic of Armenia23LCG-1C011
National Research Foundation of Ukraine2020.02/0257
National Research Foundation of Ukraine
Austrian Science Fund34529
Austrian Science Fund
Seventh FrameworkPIEF-GA-2013-622527
Agencia Estatal de InvestigaciónRYC2020-029875-I
Agencia Estatal de Investigación
SEP-CINVESTAV237
Department of Atomic Energy, Government of IndiaRTI 4002
Department of Atomic Energy, Government of India
Israel Ministry of Science3-16543
Generalitat Valenciana, SpainCIDEGENT/2018/020
Agence Nationale de la RechercheANR-21-CE31-0009
Agence Nationale de la Recherche
University of Tabuk ResearchS-0280-1439, S-0256-1438
Horizon 2020 ERC-Advanced267104, 884719
Israel Science Foundation2476/17
Israel Science Foundation
Ministry of Higher Education, MalaysiaFOINS-296, CB-236394, CB-180023, CB-254409, CB-221329
Ministry of Higher Education, Malaysia
Japan Society for the Promotion of Science16H06492, 18H05226, 18K03621, 26400255, 22H00144, 20H05850, 19H00682, 26220706, 17H01133, 22K21347, 16K05323, 20H05858, 16H03993, 16H03968, 17H05405, 23H05433, 22K14056, 18H03710
Japan Society for the Promotion of Science
National Key Research and Development Program of China2022YFA1601903
National Key Research and Development Program of China
Grantová Agentura České Republiky22-18469S
Grantová Agentura České Republiky
Horizon 2020 ERC-Consolidator819127
Horizon 2020 Framework Programme947006
Horizon 2020 Framework Programme
U.S. Department of Energy and ResearchDE-SC0010007, DE-SC0010118, DE-AC06-76RLO1830, DE-SC0010504, DE-SC0012704, DE-SC0021616, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0023470, DE-SC0009824, DE-SC0007983, DE-SC0009973
Natural Science Foundation of Shandong ProvinceZR2022JQ02
Natural Science Foundation of Shandong Province

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