Search for a τ+τ- Resonance in e+e- →μ+μ-τ+τ- Events with the Belle II Experiment

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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, A. Johnson, K. K. Joo, H. Junkerkalefeld, H. Kakuno, M. Kaleta, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, R. Karl, G. Karyan, T. Kawasaki, F. Keil, C. Ketter, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, H. Kindo, 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, M. Kumar, R. 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. B. Li, J. Libby, K. Lieret, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, A. Lozar, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, R. Manfredi, E. 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8 Scopus citations

Abstract

We report the first search for a nonstandard-model resonance decaying into τ pairs in e+e-→μ+μ-τ+τ- events in the 3.6-10 GeV/c2 mass range. We use a 62.8 fb-1 sample of e+e- collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axionlike particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into τ pairs, ranging from 0.7 to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/c2 and for the axionlike particle model over the entire mass range.

Original languageEnglish
Article number121802
JournalPhysical Review Letters
Volume131
Issue number12
DOIs
StatePublished - 22 Sep 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
Ministry of Education and Science of the Russian Federation
TUBITAK ULAKBIM
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
Australian Research CouncilDP210101900, DP210102831, DP200101792, DE220100462, LE210100098, LE230100085
L’Agence Nationale de la RechercheANR-21-CE31-0009
SEP-CINVESTAV237
Grantová Agentura České Republiky22-18469S
Vietnam Academy of Science and TechnologyDL0000.05/21-23
U.S. Department of Energy and ResearchDE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0012704, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0023470, DE-SC0009824, DE-SC0007983, DE-SC0009973
Science Committee of the Republic of Armenia20TTCG-1C010
National Key Research and Development Program of China2022YFA1601903
Horizon 2020 ERC-Advanced884719
National Science FoundationPHY-2111604, 0010007, PHY-1913789
Horizon 2020 Framework Programme947006, 819127
National Research Foundation of Ukraine2020.02/0257
Ministry of Higher Education, MalaysiaFOINS-296, CB-180023, CB-254409, CB-236394, CB-221329
Department of Atomic Energy, Government of IndiaRTI 4002
Slovenian Research Agency and ResearchJ1-9124, P1-0135
European Commission267104
United States-Israel Binational Science Foundation2016113
Seventh Framework Programme622527
Israel Ministry of Science3-16543
Austrian Science FundP 31361, P 31361-N36
Horizon 2020 Marie Sklodowska-Curie700525, 822070, 101026516
Generalitat Valenciana, SpainCIDEGENT/2018/020
Japan Society for the Promotion of Science16H06492, 18H05226, 18K03621, 26400255, 22H00144, 19H00682, 26220706, 19K03888, 17H01133, 16K05323, 16H03993, 16H03968, 17H05405, 23H05433, 22K14056, 18H03710
Israel Science Foundation2476/17
Ministry of Science Research and TechnologyMOST107-2119-M-002-035-MY3, MOST106-2112-M-002-005-MY3
UPES SEEDUPES/RD-SOE/20062022/06, D-SEED-INFRA/17052023/01
Natural Science Foundation of Shandong ProvinceZR2022JQ02
Seventh FrameworkPIEF-GA-2013-622527
National Research Foundation of Korea2022R1A2C1003993, 2016R1D1A1B02012900, 2018R1A2B3003643, 2021R1F1A1064008, 2021R1A6A1A03043957, RS-2022-00197659, 2021R1F1A1060423, 2019R1I1A3A01058933, 2018R1A6A1A06024970
University of Tabuk ResearchS-0280-1439, S-0256-1438
Agencia Estatal de InvestigaciónRYC2020-029875-I
National Natural Science Foundation of China and Research12175041, 12135005, 11975076, 11761141009, 11575017, 12150004, 12161141008, 11705209

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