Evidence for B+ →k+ν ν ¯ decays

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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, 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, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M.G. Kraetzschmar, P. KriŽan, P. Krokovny, Y. Kulii, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y. J. Kwon, S. Lacaprara, Y. T. Lai, T. Lam, 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, J. Libby, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, A. Lozar, T. Lueck, T. Luo, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, G. Mancinelli, R. Manfredi, E. Manoni, A. C. Manthei, M. Mantovano, D. Marcantonio, S. 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Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

We search for the rare decay B+→K+νν¯ in a 362 fb-1 sample of electron-positron collisions at the δ (4S) resonance collected with the Belle II detector at the SuperKEKB collider. We use the inclusive properties of the accompanying B meson in δ (4S)→BB¯ events to suppress background from other decays of the signal B candidate and light-quark pair production. We validate the measurement with an auxiliary analysis based on a conventional hadronic reconstruction of the accompanying B meson. For background suppression, we exploit distinct signal features using machine learning methods tuned with simulated data. The signal-reconstruction efficiency and background suppression are validated through various control channels. The branching fraction is extracted in a maximum likelihood fit. Our inclusive and hadronic analyses yield consistent results for the B+→K+νν¯ branching fraction of [2.7±0.5(stat)±0.5(syst)]×10-5 and [1.1-0.8+0.9(stat)-0.5+0.8(syst)]×10-5, respectively. Combining the results, we determine the branching fraction of the decay B+→K+νν¯ to be [2.3±0.5(stat)-0.4+0.5(syst)]×10-5, providing the first evidence for this decay at 3.5 standard deviations. The combined result is 2.7 standard deviations above the standard model expectation.

Original languageEnglish
Article number112006
JournalPhysical Review D
Volume109
Issue number11
DOIs
StatePublished - 1 Jun 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
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
Israel Ministry of Science3-16543
Natural Science Foundation of Shandong ProvinceZR2022JQ02
United States-Israel Binational Science Foundation2016113
Israel Science Foundation2476/17
Australian Research CouncilDP210101900, DP210102831, DP200101792, DE220100462, LE210100098, LE230100085
National Key Research and Development Program of China2022YFA1601903
University of Petroleum and Energy StudiesD-SOE/20062022/06, D-SEED-INFRA/17052023/01
Seventh FrameworkPIEF-GA-2013-622527
Horizon 2020 Marie Sklodowska-Curie700525, 822070, 101026516
National Research Foundation of Ukraine2020.02/0257
National Research Foundation of Korea2022R1A2C1003993, 2016R1D1A1B02012900, 2018R1A2B3003643, 2021R1A6A1A03043957, 2021R1F1A1064008, RS-2022-00197659, 2019R1I1A3A01058933, 2021R1F1A1060423, 2018R1A6A1A06024970
L'Agence Nationale de la RechercheANR-21-CE31-0009
U.S. Department of Energy and ResearchDE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0021616, DE-SC0012704, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0023470, DE-SC0009824, DE-SC0007983, DE-SC0009973
Ministry of Higher Education, MalaysiaFOINS-296, CB-254409, CB-180023, CB-236394, CB-221329
Department of Atomic Energy, Government of IndiaRTI 4002
Grantová Agentura České Republiky22-18469S
Generalitat Valenciana, SpainCIDEGENT/2018/020
University of Tabuk ResearchS-0280-1439, S-0256-1438
National Science FoundationPHY-2111604, PHY-1913789
Austrian Science FundP 31361-N36
Higher Education and Science Committee of the Republic of Armenia23LCG-1C011
Horizon 2020 Framework Programme947006, 819127
Agencia Estatal de InvestigaciónRYC2020-029875-I
Japan Society for the Promotion of Science26400255, 18K03621, 18H05226, 16H06492, 22H00144, 19H00682, 20H05850, 26220706, 17H01133, 22K21347, 16K05323, 20H05858, 16H03993, 16H03968, 17H05405, 23H05433, 22K14056, 18H03710
SEP-CINVESTAV237
Vietnam Academy of Science and TechnologyDL0000.02/24-25, NVCC.05.12/22-23
National Natural Science Foundation of China and Research12175041, 12135005, 11975076, 11761141009, 11575017, 12150004, 12161141008, 11705209
Slovenian Research Agency and ResearchJ1-9124, P1-0135
Horizon 2020 ERC-Advanced267104, 884719

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