Measurement of the τ -lepton mass with the Belle II experiment

I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw Banerjee, M. Barrett, J. BaudotM. Bauer, A. Baur, A. Beaubien, F. Becherer, J. Becker, P. K. Behera, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M. C. Chang, P. Chang, R. Cheaib, P. Cheema, V. Chekelian, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H. E. Cho, K. Cho, S. J. Cho, S. K. Choi, S. Choudhury, J. Cochran, L. Corona, L. M. Cremaldi, S. Das, 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, S. Dey, A. De Yta-Hernandez, R. Dhamija, A. Di Canto, F. Di Capua, J. Dingfelder, Z. DoleŽal, I. Domínguez Jiménez, T. V. Dong, M. Dorigo, K. Dort, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, A. Garmash, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, P. Grace, W. Gradl, T. Grammatico, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, S. Halder, Y. Han, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, I. Heredia De La Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hoek, M. Hohmann, C. L. Hsu, T. Iijima, K. Inami, G. Inguglia, N. Ipsita, A. Ishikawa, S. Ito, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, D. E. Jaffe, E. J. Jang, Q. P. Ji, S. Jia, Y. Jin, A. Johnson, K. K. Joo, H. Junkerkalefeld, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, H. Kindo, 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, J. Kumar, M. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y. J. Kwon, S. Lacaprara, Y. T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, P. Leitl, D. Levit, P. M. Lewis, C. Li, L. K. Li, Y. Li, J. Libby, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, 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, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H. G. Moser, M. Mrvar, R. Mussa, I. Nakamura, Y. Nakazawa, A. Narimani Charan, M. Naruki, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, C. Niebuhr, N. K. Nisar, S. Nishida, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, S. Pardi, K. Parham, H. Park, S. H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, F. Pham, 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, N. Rad, P. Rados, G. Raeuber, S. Raiz, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, 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. Sharma, C. P. Shen, X. D. Shi, T. Shillington, J. G. Shiu, D. Shtol, B. Shwartz, 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, Z. S. Stottler, R. Stroili, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takahashi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, A. Thaller, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, N. Toutounji, K. Trabelsi, I. Tsaklidis, I. Ueda, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. Van Tonder, G. S. Varner, K. E. Varvell, M. Veronesi, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M. Z. Wang, Z. Wang, A. Warburton, M. Watanabe, S. Watanuki, M. Welsch, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. H. Yin, K. Yoshihara, C. Z. Yuan, Y. Yusa, L. Zani, V. Zhilich, J. S. Zhou, Q. D. Zhou, V. I. Zhukova, R. Žlebčík

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11 Scopus citations

Abstract

We present a measurement of the τ-lepton mass using a sample of about 175 million e+e-→τ+τ- events collected with the Belle II detector at the SuperKEKB e+e- collider at a center-of-mass energy of 10.579 GeV. This sample corresponds to an integrated luminosity of 190 fb-1. We use the kinematic edge of the τ pseudomass distribution in the decay τ-→π-π+π-ντ and measure the τ mass to be 1777.09±0.08±0.11 MeV/c2, where the first uncertainty is statistical and the second systematic. This result is the most precise to date.

Original languageEnglish
Article number032006
JournalPhysical Review D
Volume108
Issue number3
DOIs
StatePublished - 1 Aug 2023

Funding

FundersFunder number
Ministry of Education
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
Deutsche Forschungsgemeinschaft
European Commission
Ministry of Education and Science of the Russian Federation
Natural Sciences and Engineering Research Council of Canada
TUBITAK ULAKBIM
Horizon 2020 ERC-Advanced
National Research University Higher School of Economics
Compute Canada
European Research Council
Ministerstwo Edukacji i Nauki
Generalitat Valenciana, Spain
GLORIAD
Horizon 2020 ERC-Consolidator
Alexander von Humboldt-Stiftung
Ministry of Education, Culture, Sports, Science and Technology
Israel Science Foundation2476/17
Japan Society for the Promotion of Science18K03621, 16H06492, 18H05226, 26400255, 22H00144, 19H00682, 26220706, 17H01133, 19K03888, 16K05323, 16H03993, 16H03968, 17H05405, 18H03710
Australian Research CouncilDP210101900, DP210102831, DE220100462, DP200101792, LE210100098, LE230100085
University of TabukS-0280-1439, S-0256-1438
Vietnam Academy of Science and TechnologyDL0000.05/21-23
Seventh Framework Programme700525, 822070, 267104, 884719, 622527, 819127, 101026516, 1913789
National Key Research and Development Program of China2022YFA1601903
Ministry of Higher Education, Malaysia237, FOINS-296, CB-180023, CB-254409, CB-236394, CB-221329
National Science Foundation2111604, PHY-1913789
Science Committee of the Republic of Armenia20TTCG-1C010
Natural Science Foundation of Shandong ProvinceZR2022JQ02
Agencia Estatal de InvestigaciónRYC2020-029875-I
Javna Agencija za Raziskovalno Dejavnost RSJ1-9124, P1-0135
National Research Foundation of Ukraine2020.02/0257
Seventh FrameworkPIEF-GA-2013-622527
Austrian Science FundP 31361, J 4625, P 31361-N36
Department of Atomic Energy, Government of IndiaRTI 4002
Horizon 2020 Marie Sklodowska-Curie101026516
United States-Israel Binational Science Foundation2016113
U.S. Department of EnergyDE-SC0010007, DE-SC0010118, DE-AC06-76RLO1830, DE-SC0010504, DE-SC0012704, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0023470, DE-SC0009824, DE-SC0007983, DE-SC0009973
Ministerstvo Školství, Mládeže a TělovýchovyLTT17020
National Natural Science Foundation of China12175041, 12135005, 11975076, 11761141009, 11575017, 12150004, 12161141008, 11705209
Univerzita Karlova v PrazeSVV 260448
Grantová Agentura České Republiky22-18469S
Horizon 2020 Framework Programme947006
Israel Ministry of Science3-16543
National Research Foundation of Korea2022R1-A2C-1003993, 2018R1-A6A1A-06024970, 2018R1-A2B-3003643, 2016R1-D1A1B-02012900, RS-2022-00197659, 2018R1-D1A1B-07047294, 2019R1-I1A3A-01058933
CIDEGENT/2018/020 Ministry of Science and TechnologyMOST107-2119-M-002-035-MY3, MOST106-2112-M-002-005-MY3

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