Letter
Open Access

Search for the decay $B^{0} \to K^{* 0} τ^{+} τ^{-}$ at the Belle experiment

T. V. Dong¹⁰, T. Luo ¹⁰, I. Adachi^16,12, H. Aihara⁸⁵, D. M. Asner³, H. Atmacan⁷, V. Aulchenko^4,64, T. Aushev¹⁸, R. Ayad⁹² et al. (The Belle Collaboration)

R. Ayad⁹², V. Babu⁸, S. Bahinipati²², P. Behera²⁵, K. Belous²⁹, F. Bernlochner², M. Bessner¹⁵, B. Bhuyan²³, T. Bilka⁵, J. Biswal³⁴, A. Bobrov^4,64, A. Bozek⁶¹, M. Bračko^49,34, P. Branchini³¹, T. E. Browder¹⁵, A. Budano³¹, M. Campajola^30,56, D. Červenkov⁵, M.-C. Chang⁹, P. Chang⁶⁰, A. Chen⁵⁸, B. G. Cheon¹⁴, K. Chilikin⁴⁴, H. E. Cho¹⁴, K. Cho³⁹, S.-J. Cho⁹¹, S.-K. Choi¹³, Y. Choi⁷⁸, S. Choudhury²⁴, D. Cinabro⁸⁹, S. Cunliffe⁸, T. Czank³⁶, S. Das⁴⁸, G. De Nardo^30,56, G. De Pietro³¹, R. Dhamija²⁴, F. Di Capua^30,56, J. Dingfelder², Z. Doležal⁵, S. Dubey¹⁵, D. Epifanov^4,64, T. Ferber⁸, D. Ferlewicz⁵¹, B. G. Fulsom⁶⁶, R. Garg⁶⁷, V. Gaur⁸⁸, N. Gabyshev^4,64, A. Garmash^4,64, A. Giri²⁴, P. Goldenzweig³⁵, E. Graziani³¹, T. Gu⁶⁹, K. Gudkova^4,64, T. Hara^16,12, O. Hartbrich¹⁵, K. Hayasaka⁶³, M. Hernandez Villanueva⁸, W.-S. Hou⁶⁰, C.-L. Hsu⁷⁹, K. Inami⁵⁵, G. Inguglia²⁸, A. Ishikawa^16,12, R. Itoh^16,12, M. Iwasaki⁶⁵, W. W. Jacobs²⁶, E.-J. Jang¹³, S. Jia¹⁰, Y. Jin⁸⁵, K. K. Joo⁶, J. Kahn³⁵, K. H. Kang⁴², H. Kichimi¹⁶, C. Kiesling⁵⁰, C. H. Kim¹⁴, D. Y. Kim⁷⁷, S. H. Kim⁷⁵, Y.-K. Kim⁹¹, T. D. Kimmel⁸⁸, P. Kodyš⁵, T. Konno³⁸, A. Korobov^4,64, S. Korpar^49,34, E. Kovalenko^4,64, P. Križan^45,34, R. Kroeger⁵², P. Krokovny^4,64, T. Kuhr⁴⁶, R. Kulasiri³⁷, M. Kumar⁴⁸, R. Kumar⁷⁰, K. Kumara⁸⁹, A. Kuzmin^4,64, Y.-J. Kwon⁹¹, M. Laurenza^31,73, S. C. Lee⁴², J. Li⁴², L. K. Li⁷, Y. B. Li⁶⁸, L. Li Gioi⁵⁰, J. Libby²⁵, K. Lieret⁴⁶, D. Liventsev^89,16, C. MacQueen⁵¹, M. Masuda^84,71, T. Matsuda⁵³, D. Matvienko^4,64,44, M. Merola^30,56, F. Metzner³⁵, K. Miyabayashi⁵⁷, R. Mizuk^44,18, G. B. Mohanty⁸⁰, M. Nakao^16,12, A. Natochii¹⁵, L. Nayak²⁴, M. Niiyama⁴¹, N. K. Nisar³, S. Nishida^16,12, K. Nishimura¹⁵, S. Ogawa⁸², H. Ono^62,63, Y. Onuki⁸⁵, P. Oskin⁴⁴, P. Pakhlov^44,54, G. Pakhlova^18,44, S. Pardi³⁰, H. Park⁴², S.-H. Park¹⁶, S. Patra²¹, S. Paul^81,50, T. K. Pedlar⁴⁷, R. Pestotnik³⁴, L. E. Piilonen⁸⁸, T. Podobnik^45,34, V. Popov¹⁸, E. Prencipe¹⁹, M. T. Prim², A. Rostomyan⁸, N. Rout²⁵, G. Russo⁵⁶, D. Sahoo⁸⁰, S. Sandilya²⁴, A. Sangal⁷, L. Santelj^45,34, T. Sanuki⁸³, V. Savinov⁶⁹, G. Schnell^1,20, J. Schueler¹⁵, C. Schwanda²⁸, Y. Seino⁶³, K. Senyo⁹⁰, M. E. Sevior⁵¹, M. Shapkin²⁹, C. Sharma⁴⁸, J.-G. Shiu⁶⁰, F. Simon⁵⁰, E. Solovieva⁴⁴, M. Starič³⁴, M. Sumihama¹¹, K. Sumisawa^16,12, T. Sumiyoshi⁸⁷, M. Takizawa^76,17,72, U. Tamponi³², K. Tanida³³, F. Tenchini⁸, K. Trabelsi⁴³, M. Uchida⁸⁶, Y. Unno¹⁴, S. Uno^16,12, R. Van Tonder², G. Varner¹⁵, K. E. Varvell⁷⁹, E. Waheed¹⁶, C. H. Wang⁵⁹, E. Wang⁶⁹, P. Wang²⁷, M. Watanabe⁶³, S. Watanuki⁴³, O. Werbycka⁶¹, E. Won⁴⁰, B. D. Yabsley⁷⁹, W. Yan⁷⁴, S. B. Yang⁴⁰, H. Ye⁸, J. H. Yin⁴⁰, Z. P. Zhang⁷⁴, V. Zhilich^4,64, and V. Zhukova⁴⁴ (The Belle Collaboration)

¹Department of Physics, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain
²University of Bonn, 53115 Bonn, Germany
³Brookhaven National Laboratory, Upton, New York 11973, USA
⁴Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia
⁵Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
⁶Chonnam National University, Gwangju 61186, South Korea
⁷University of Cincinnati, Cincinnati, Ohio 45221, USA
⁸Deutsches Elektronen–Synchrotron, 22607 Hamburg, Germany
⁹Department of Physics, Fu Jen Catholic University, Taipei 24205, Taiwan
¹⁰Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, China
¹¹Gifu University, Gifu 501-1193, Japan
¹²SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan
¹³Gyeongsang National University, Jinju 52828, South Korea
¹⁴Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763, South Korea
¹⁵University of Hawaii, Honolulu, Hawaii 96822, USA
¹⁶High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
¹⁷J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
¹⁸National Research University Higher School of Economics, Moscow 101000, Russia
¹⁹Forschungszentrum Jülich, 52425 Jülich, Germany
²⁰IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
²¹Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306, India
²²Indian Institute of Technology Bhubaneswar, Satya Nagar 751007, India
²³Indian Institute of Technology Guwahati, Assam 781039, India
²⁴Indian Institute of Technology Hyderabad, Telangana 502285, India
²⁵Indian Institute of Technology Madras, Chennai 600036, India
²⁶Indiana University, Bloomington, Indiana 47408, USA
²⁷Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
²⁸Institute of High Energy Physics, Vienna 1050, Austria
²⁹Institute for High Energy Physics, Protvino 142281, Russia
³⁰INFN - Sezione di Napoli, I-80126 Napoli, Italy
³¹INFN - Sezione di Roma Tre, I-00146 Roma, Italy
³²INFN - Sezione di Torino, I-10125 Torino, Italy
³³Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195, Japan
³⁴J. Stefan Institute, 1000 Ljubljana, Slovenia
³⁵Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany
³⁶Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583, Kashiwa, Japan
³⁷Kennesaw State University, Kennesaw, Georgia 30144, USA
³⁸Kitasato University, Sagamihara 252-0373, Japan
³⁹Korea Institute of Science and Technology Information, Daejeon 34141, South Korea
⁴⁰Korea University, Seoul 02841, South Korea
⁴¹Kyoto Sangyo University, Kyoto 603-8555, Japan
⁴²Kyungpook National University, Daegu 41566, South Korea
⁴³Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
⁴⁴P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia
⁴⁵Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
⁴⁶Ludwig Maximilians University, 80539 Munich, Germany
⁴⁷Luther College, Decorah, Iowa 52101, USA
⁴⁸Malaviya National Institute of Technology Jaipur, Jaipur 302017, India
⁴⁹Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor, Slovenia
⁵⁰Max-Planck-Institut für Physik, 80805 München, Germany
⁵¹School of Physics, University of Melbourne, Victoria 3010, Australia
⁵²University of Mississippi, University, Mississippi 38677, USA
⁵³University of Miyazaki, Miyazaki 889-2192, Japan
⁵⁴Moscow Physical Engineering Institute, Moscow 115409, Russia
⁵⁵Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
⁵⁶Università di Napoli Federico II, I-80126 Napoli, Italy
⁵⁷Nara Women’s University, Nara 630-8506, Japan
⁵⁸National Central University, Chung-li 32054, Taiwan
⁵⁹National United University, Miao Li 36003, Taiwan
⁶⁰Department of Physics, National Taiwan University, Taipei 10617, Taiwan
⁶¹H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342, Poland
⁶²Nippon Dental University, Niigata 951-8580, Japan
⁶³Niigata University, Niigata 950-2181, Japan
⁶⁴Novosibirsk State University, Novosibirsk 630090, Russia
⁶⁵Osaka City University, Osaka 558-8585, Japan
⁶⁶Pacific Northwest National Laboratory, Richland, Washington 99352, USA
⁶⁷Panjab University, Chandigarh 160014, India
⁶⁸Peking University, Beijing 100871, China
⁶⁹University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
⁷⁰Punjab Agricultural University, Ludhiana 141004, India
⁷¹Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
⁷²Meson Science Laboratory, Cluster for Pioneering Research, RIKEN, Saitama 351-0198, Japan
⁷³Dipartimento di Matematica e Fisica, Università di Roma Tre, I-00146 Roma, Italy
⁷⁴Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
⁷⁵Seoul National University, Seoul 08826, South Korea
⁷⁶Showa Pharmaceutical University, Tokyo 194-8543, Japan
⁷⁷Soongsil University, Seoul 06978, South Korea
⁷⁸Sungkyunkwan University, Suwon 16419, South Korea
⁷⁹School of Physics, University of Sydney, New South Wales 2006, Australia
⁸⁰Tata Institute of Fundamental Research, Mumbai 400005, India
⁸¹Department of Physics, Technische Universität München, 85748 Garching, Germany
⁸²Toho University, Funabashi 274-8510, Japan
⁸³Department of Physics, Tohoku University, Sendai 980-8578, Japan
⁸⁴Earthquake Research Institute, University of Tokyo, Tokyo 113-0032, Japan
⁸⁵Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
⁸⁶Tokyo Institute of Technology, Tokyo 152-8550, Japan
⁸⁷Tokyo Metropolitan University, Tokyo 192-0397, Japan
⁸⁸Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
⁸⁹Wayne State University, Detroit, Michigan 48202, USA
⁹⁰Yamagata University, Yamagata 990-8560, Japan
⁹¹Yonsei University, Seoul 03722, South Korea
⁹²Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Saudi Arabia

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Phys. Rev. D 108, L011102 – Published 13 July, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L011102

Abstract

This paper presents a search for the rare flavor-changing neutral current process $B^{0} \to K^{* 0} τ^{+} τ^{-}$ using data taken with the Belle detector at the KEKB asymmetric energy $e^{+} e^{-}$ collider. The analysis is based on the entire $ϒ (4 S)$ resonance data sample of $711 {fb}^{- 1}$ , corresponding to $772 \times 10^{6} B \bar{B}$ pairs. In our search we fully reconstruct the companion $B$ meson produced in the process $e^{+} e^{-} \to ϒ (4 S) \to B \bar{B}$ from its hadronic decay modes, and look for the decay $B^{0} \to K^{* 0} τ^{+} τ^{-}$ in the rest of the event. No evidence for a signal is found. We report an upper limit on the branching fraction $B (B^{0} \to K^{* 0} τ^{+} τ^{-}) < 3.1 \times 10^{- 3}$ at 90% confidence level. This is the first direct limit on $B (B^{0} \to K^{* 0} τ^{+} τ^{-})$ .

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Phys. Rev. D 108, L011102– Published 13 July, 2023

Vol. 108, Iss. 1 — 1 July 2023

Received 10 October 2021
Revised 17 February 2023
Accepted 22 May 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L011102

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 the decay $B^{0} \to K^{* 0} τ^{+} τ^{-}$ at the Belle experiment

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Search for the decay B0→K*0τ+τ− at the Belle experiment

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References (40)

Search for the decay $B^{0} \to K^{* 0} τ^{+} τ^{-}$ at the Belle experiment