Letter
Open Access

Search for $B^{0}$ meson decays into $Λ$ and missing energy with a hadronic tagging method at Belle

C. Hadjivasiliou ⁶¹, B. G. Fulsom⁶¹, J. F. Strube⁶¹, I. Adachi^16,12, H. Aihara⁷⁸, D. M. Asner³, H. Atmacan⁶, T. Aushev¹⁸, V. Babu⁷ et al. (Belle Collaboration)

V. Babu⁷, K. Belous²⁸, J. Bennett⁴⁷, M. Bessner¹⁵, V. Bhardwaj²¹, B. Bhuyan²², T. Bilka⁵, J. Biswal³³, D. Bodrov^18,39, J. Borah²², A. Bozek⁵⁶, M. Bračko^44,33, P. Branchini³⁰, T. E. Browder¹⁵, A. Budano³⁰, M. Campajola^29,51, D. Červenkov⁵, M.-C. Chang⁹, P. Chang⁵⁵, A. Chen⁵³, B. G. Cheon¹⁴, K. Chilikin³⁹, H. E. Cho¹⁴, S.-K. Choi¹³, Y. Choi⁷¹, S. Choudhury²³, D. Cinabro⁸², S. Cunliffe⁷, S. Das⁴³, G. De Pietro³⁰, F. Di Capua^29,51, Z. Doležal⁵, T. V. Dong¹⁰, D. Dossett⁴⁶, D. Epifanov^4,59, T. Ferber⁷, R. Garg⁶², V. Gaur⁸¹, A. Giri²³, P. Goldenzweig³⁴, T. Gu⁶⁴, K. Gudkova^4,59, H. Hayashii⁵², W.-S. Hou⁵⁵, C.-L. Hsu⁷², T. Iijima^50,49, K. Inami⁴⁹, G. Inguglia²⁷, A. Ishikawa^16,12, M. Iwasaki⁶⁰, Y. Iwasaki¹⁶, W. W. Jacobs²⁵, S. Jia¹⁰, Y. Jin⁷⁸, J. Kahn³⁴, A. B. Kaliyar⁷³, K. H. Kang³⁷, G. Karyan⁷, C. Kiesling⁴⁵, C. H. Kim¹⁴, D. Y. Kim⁷⁰, K. T. Kim³⁶, Y.-K. Kim⁸⁴, P. Kodyš⁵, T. Konno³⁵, A. Korobov^4,59, S. Korpar^44,33, E. Kovalenko^4,59, P. Križan^40,33, R. Kroeger⁴⁷, P. Krokovny^4,59, R. Kumar⁶⁵, K. Kumara⁸², Y.-J. Kwon⁸⁴, S. C. Lee³⁷, L. K. Li⁶, S. X. Li¹⁰, Y. B. Li⁶³, L. Li Gioi⁴⁵, J. Libby²⁴, K. Lieret⁴¹, C. MacQueen⁴⁶, M. Masuda^77,66, D. Matvienko^4,59,39, M. Merola^29,51, K. Miyabayashi⁵², R. Mizuk^39,18, G. B. Mohanty⁷³, R. Mussa³¹, M. Nakao^16,12, Z. Natkaniec⁵⁶, A. Natochii¹⁵, M. Nayak⁷⁵, N. K. Nisar³, S. Nishida^16,12, K. Nishimura¹⁵, H. Ono^57,58, P. Oskin³⁹, P. Pakhlov^39,48, G. Pakhlova^18,39, T. Pang⁶⁴, S.-H. Park¹⁶, S. Paul^74,45, T. K. Pedlar⁴², L. E. Piilonen⁸¹, T. Podobnik^40,33, V. Popov¹⁸, E. Prencipe¹⁹, M. T. Prim², M. Röhrken⁷, A. Rostomyan⁷, N. Rout²⁴, G. Russo⁵¹, D. Sahoo⁷³, S. Sandilya²³, A. Sangal⁶, L. Santelj^40,33, T. Sanuki⁷⁶, V. Savinov⁶⁴, G. Schnell^1,20, C. Schwanda²⁷, Y. Seino⁵⁸, K. Senyo⁸³, M. Shapkin²⁸, C. P. Shen¹⁰, J.-G. Shiu⁵⁵, B. Shwartz^4,59, F. Simon⁴⁵, J. B. Singh⁶², E. Solovieva³⁹, M. Starič³³, Z. S. Stottler⁸¹, M. Sumihama¹¹, T. Sumiyoshi⁸⁰, M. Takizawa^69,17,67, K. Tanida³², F. Tenchini⁷, M. Uchida⁷⁹, T. Uglov^39,18, Y. Unno¹⁴, S. Uno^16,12, R. Van Tonder², G. Varner¹⁵, A. Vinokurova^4,59, E. Waheed¹⁶, C. H. Wang⁵⁴, E. Wang⁶⁴, M.-Z. Wang⁵⁵, P. Wang²⁶, X. L. Wang¹⁰, S. Watanuki³⁸, L. Wood⁶¹, B. D. Yabsley⁷², W. Yan⁶⁸, H. Ye⁷, J. Yelton⁸, J. H. Yin³⁶, Z. P. Zhang⁶⁸, V. Zhilich^4,59, and V. Zhukova³⁹ (Belle Collaboration)

¹Department of Physics, University of the Basque Country UPV/EHU, 48080 Bilbao
²University of Bonn, 53115 Bonn
³Brookhaven National Laboratory, Upton, New York 11973
⁴Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
⁵Faculty of Mathematics and Physics, Charles University, 121 16 Prague
⁶University of Cincinnati, Cincinnati, Ohio 45221
⁷Deutsches Elektronen–Synchrotron, 22607 Hamburg
⁸University of Florida, Gainesville, Florida 32611
⁹Department of Physics, Fu Jen Catholic University, Taipei 24205
¹⁰Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
¹¹Gifu University, Gifu 501-1193
¹²SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
¹³Gyeongsang National University, Jinju 52828
¹⁴Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
¹⁵University of Hawaii, Honolulu, Hawaii 96822
¹⁶High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
¹⁷J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
¹⁸National Research University Higher School of Economics, Moscow 101000
¹⁹Forschungszentrum Jülich, 52425 Jülich
²⁰IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
²¹Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
²²Indian Institute of Technology Guwahati, Assam 781039
²³Indian Institute of Technology Hyderabad, Telangana 502285
²⁴Indian Institute of Technology Madras, Chennai 600036
²⁵Indiana University, Bloomington, Indiana 47408
²⁶Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
²⁷Institute of High Energy Physics, Vienna 1050
²⁸Institute for High Energy Physics, Protvino 142281
²⁹INFN—Sezione di Napoli, I-80126 Napoli
³⁰INFN—Sezione di Roma Tre, I-00146 Roma
³¹INFN—Sezione di Torino, I-10125 Torino
³²Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
³³J. Stefan Institute, 1000 Ljubljana
³⁴Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
³⁵Kitasato University, Sagamihara 252-0373
³⁶Korea University, Seoul 02841
³⁷Kyungpook National University, Daegu 41566
³⁸Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay
³⁹P. N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
⁴⁰Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
⁴¹Ludwig Maximilians University, 80539 Munich
⁴²Luther College, Decorah, Iowa 52101
⁴³Malaviya National Institute of Technology Jaipur, Jaipur 302017
⁴⁴Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor
⁴⁵Max-Planck-Institut für Physik, 80805 München
⁴⁶School of Physics, University of Melbourne, Victoria 3010
⁴⁷University of Mississippi, University, Mississippi 38677
⁴⁸Moscow Physical Engineering Institute, Moscow 115409
⁴⁹Graduate School of Science, Nagoya University, Nagoya 464-8602
⁵⁰Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
⁵¹Università di Napoli Federico II, I-80126 Napoli
⁵²Nara Women’s University, Nara 630-8506
⁵³National Central University, Chung-li 32054
⁵⁴National United University, Miao Li 36003
⁵⁵Department of Physics, National Taiwan University, Taipei 10617
⁵⁶H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
⁵⁷Nippon Dental University, Niigata 951-8580
⁵⁸Niigata University, Niigata 950-2181
⁵⁹Novosibirsk State University, Novosibirsk 630090
⁶⁰Osaka City University, Osaka 558-8585
⁶¹Pacific Northwest National Laboratory, Richland, Washington 99352
⁶²Panjab University, Chandigarh 160014
⁶³Peking University, Beijing 100871
⁶⁴University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁶⁵Punjab Agricultural University, Ludhiana 141004
⁶⁶Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
⁶⁷Meson Science Laboratory, Cluster for Pioneering Research, RIKEN, Saitama 351-0198
⁶⁸Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026
⁶⁹Showa Pharmaceutical University, Tokyo 194-8543
⁷⁰Soongsil University, Seoul 06978
⁷¹Sungkyunkwan University, Suwon 16419
⁷²School of Physics, University of Sydney, New South Wales 2006
⁷³Tata Institute of Fundamental Research, Mumbai 400005
⁷⁴Department of Physics, Technische Universität München, 85748 Garching
⁷⁵School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978
⁷⁶Department of Physics, Tohoku University, Sendai 980-8578
⁷⁷Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
⁷⁸Department of Physics, University of Tokyo, Tokyo 113-0033
⁷⁹Tokyo Institute of Technology, Tokyo 152-8550
⁸⁰Tokyo Metropolitan University, Tokyo 192-0397
⁸¹Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁸²Wayne State University, Detroit, Michigan 48202
⁸³Yamagata University, Yamagata 990-8560
⁸⁴Yonsei University, Seoul 03722

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Phys. Rev. D 105, L051101 – Published 4 March, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L051101

Abstract

We present a search for the decays of $B^{0}$ mesons into a final state containing a $Λ$ baryon and missing energy. These results are obtained from a $711 {fb}^{- 1}$ data sample that contains $772 \times 10^{6} B \bar{B}$ pairs and was collected near the $ϒ (4 S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode and require the remainder of the event to consist of only a single $Λ$ . No evidence for these decays is found, and we set 90% confidence level upper limits on the branching fractions in the range $2.1 - 3.8 \times 10^{- 5}$ . This measurement provides the world’s most restrictive limits, with implications for baryogenesis and dark matter production.

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References (20)

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Phys. Rev. D 105, L051101– Published 4 March, 2022

Vol. 105, Iss. 5 — 1 March 2022

Received 29 October 2021
Accepted 17 February 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L051101

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Search for $B^{0}$ meson decays into $Λ$ and missing energy with a hadronic tagging method at Belle

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Search for B0 meson decays into Λ and missing energy with a hadronic tagging method at Belle

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Search for $B^{0}$ meson decays into $Λ$ and missing energy with a hadronic tagging method at Belle