Search for Lepton-Flavor-Violating τ Decays to a Lepton and an Invisible Boson at Belle II

I. Adachi, K. Adamczyk, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, T. Aushev, V. Aushev, H. Bae, S. Bahinipati, P. Bambade, Sw Banerjee, J. Baudot, M. Bauer, A. Baur, A. Beaubien, J. BeckerP. K. Behera, J. V. Bennett, E. Bernieri, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, D. Bodrov, A. Bolz, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, M. C. Chang, P. Chang, R. Cheaib, P. Cheema, V. Chekelian, Y. Q. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H. E. Cho, K. Cho, S. J. Cho, S. K. Choi, S. Choudhury, D. Cinabro, L. Corona, S. Cunliffe, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, 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, D. Dossett, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, D. Epifanov, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, K. Flood, A. Fodor, F. Forti, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, P. Goldenzweig, W. Gradl, S. Granderath, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, K. Gudkova, J. Guilliams, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, I. Heredia De La Cruz, M. Hernández Villanueva, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hohmann, C. L. Hsu, T. Humair, 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, K. K. Joo, H. Junkerkalefeld, H. Kakuno, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, R. Karl, G. Karyan, 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, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M.G. Kraetzschmar, P. KriŽan, P. Krokovny, T. Kuhr, J. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y. J. Kwon, S. Lacaprara, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, K. Lautenbach, R. Leboucher, F. R. Le Diberder, P. Leitl, P. M. Lewis, C. Li, L. K. Li, Y. B. Li, J. Libby, K. Lieret, Z. Liptak, Q. Y. Liu, D. Liventsev, S. Longo, A. Lozar, T. Lueck, T. Luo, C. Lyu, M. Maggiora, R. Maiti, S. Maity, R. Manfredi, E. Manoni, A. Manthei, S. Marcello, C. Marinas, L. Martel, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Moneta, H. G. Moser, M. Mrvar, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, H. Nakayama, Y. Nakazawa, A. Narimani Charan, M. Naruki, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, C. Niebuhr, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, S. Pardi, K. Parham, H. Park, S. H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, I. Peruzzi, R. Peschke, R. Pestotnik, F. Pham, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L.M. Podesta-Lerma, T. Podobnik, S. Pokharel, L. Polat, C. Praz, S. Prell, E. Prencipe, M. T. Prim, H. Purwar, N. Rad, P. Rados, G. Raeuber, S. Raiz, A. Ramirez Morales, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, S. H. Robertson, D. Rodríguez Pérez, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, A. Sangal, L. Santelj, Y. Sato, V. Savinov, B. Scavino, J. Schueler, C. Schwanda, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, C. P. Shen, X. D. Shi, T. Shillington, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, Y. Sue, M. Sumihama, K. Sumisawa, W. Sutcliffe, S. Y. Suzuki, H. Svidras, M. Takizawa, U. Tamponi, K. Tanida, H. Tanigawa, F. Tenchini, A. Thaller, R. Tiwary, D. Tonelli, E. Torassa, N. Toutounji, K. Trabelsi, M. Uchida, I. Ueda, Y. Uematsu, T. Uglov, K. Unger, Y. Unno, K. Uno, S. Uno, Y. Ushiroda, S. E. Vahsen, R. Van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, L. Vitale, V. Vobbilisetti, H. M. Wakeling, E. Wang, M. Z. Wang, X. L. Wang, A. Warburton, M. Watanabe, S. Watanuki, M. Welsch, C. Wessel, J. Wiechczynski, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, Y. M. Yook, K. Yoshihara, C. Z. Yuan, Y. Yusa, L. Zani, Y. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, R. Žlebčík

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We search for lepton-flavor-violating τ-→e-α and τ-→μ-α decays, where α is an invisible spin-0 boson. The search uses electron-positron collisions at 10.58 GeV center-of-mass energy with an integrated luminosity of 62.8 fb-1, produced by the SuperKEKB collider and collected with the Belle II detector. We search for an excess in the lepton-energy spectrum of the known τ-→e-ν¯eντ and τ-→μ-ν¯μντ decays. We report 95% confidence-level upper limits on the branching-fraction ratio B(τ-→e-α)/B(τ-→e-ν¯eντ) in the range (1.1-9.7)×10-3 and on B(τ-→μ-α)/B(τ-→μ-ν¯μντ) in the range (0.7-12.2)×10-3 for α masses between 0 and 1.6 GeV/c2. These results provide the most stringent bounds on invisible boson production from τ decays.

Original languageEnglish
Article number181803
JournalPhysical Review Letters
Volume130
Issue number18
DOIs
StatePublished - 5 May 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
CAS Center for Excellence in Particle Physics
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
GLORIAD
Horizon 2020 ERC-Consolidator
Alexander von Humboldt-Stiftung
Ministry of Education, Culture, Sports, Science and Technology
Horizon 2020 Marie Sklodowska-Curie101026516
Agencia Estatal de InvestigaciónRYC2020-029875-I
National Science FoundationPHY-2111604, PHY-1913789, 1913789
Grantová Agentura České Republiky22-18469S
National Research Foundation of Ukraine2020.02/0257
Austrian Science FundP 31361, J 4625, P 31361-N36
Ministerstvo Školství, Mládeže a TělovýchovyLTT17020
Horizon 2020 Framework Programme947006, 700525, 822070, 884719, 267104, 819127, 101026516, 1913789
Australian Research CouncilDP170102204, FT120100745, DP180102629, DP150103061, DE220100462, FT130100018, DP170102389, FT130100303
Liaoning Revitalization Talents ProgramXLYC1807135
National Research Foundation of Korea2022R1-A2C-1003993, 2018R1-A2B-3003643, 2018R1-A6A1A-06024970, 2016R1-D1A1B-02012900, RS-2022-00197659, 2018R1-D1A1B-07047294, 2019R1-I1A3A-01058933
Science Committee of the Republic of Armenia20TTCG-1C010
United States-Israel Binational Science Foundation2016113
Natural Science Foundation of Shandong ProvinceZR2022JQ02
Shanghai Pujiang Program18PJ1401000
University of TabukS-0280-1439, S-0256-1438
Seventh FrameworkPIEF-GA-2013-622527
Japan Society for the Promotion of Science16H06492, 26400255, 18H05226, 18K03621, 22H00144, 19H00682, 26220706, 17H01133, 16K05323, 16H03993, 16H03968, 17H05405, 18H03710
National Natural Science Foundation of China11521505, 11975076, 11761141009, 11575017, 11675166, 11705209
Israel Science Foundation2476/17
Javna Agencija za Raziskovalno Dejavnost RSJ1-9124, P1-0135
U.S. Department of EnergyDE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0012704, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0009824, DE-SC0007983, DE-SC0009973
Generalitat Valenciana, SpainCIDEGENT/2018/020
Ministry of Higher Education, MalaysiaFOINS-296, CB-254409, CB-180023, CB-236394, CB-221329
Chinese Academy of SciencesQYZDJ-SSW-SLH011
Department of Atomic Energy, Government of IndiaRTI 4002
SEP-CINVESTAV237
Vietnam Academy of Science and TechnologyDL0000.05/21-23
Ministry of Science and TechnologyMOST107-2119-M-002-035-MY3, MOST106-2112-M-002-005-MY3
Univerzita Karlova v PrazeSVV 260448
Israel Ministry of Science3-16543

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