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First test of lepton flavor universality in the charmed baryon decays $Ω_{c}^{0} \to Ω^{-} ℓ^{+} ν_{ℓ}$ using data of the Belle experiment

Y. B. Li¹³, C. P. Shen ¹³, I. Adachi^19,15, H. Aihara⁸⁵, S. Al Said^79,41, D. M. Asner³, H. Atmacan⁸, T. Aushev²¹, R. Ayad⁷⁹ et al. (The Belle Collaboration)

R. Ayad⁷⁹, V. Babu⁹, S. Bahinipati²⁵, P. Behera²⁸, K. Belous³², J. Bennett⁵⁴, F. Bernlochner², M. Bessner¹⁸, B. Bhuyan²⁶, T. Bilka⁵, A. Bobrov^4,64, D. Bodrov^21,46, J. Borah²⁶, A. Bozek⁶¹, M. Bračko^51,38, P. Branchini³⁴, T. E. Browder¹⁸, A. Budano³⁴, M. Campajola^33,57, D. Červenkov⁵, M.-C. Chang¹², P. Chang⁶⁰, V. Chekelian⁵², A. Chen⁵⁹, B. G. Cheon¹⁷, K. Chilikin⁴⁶, H. E. Cho¹⁷, K. Cho⁴³, S.-J. Cho⁹¹, S.-K. Choi⁷, Y. Choi⁷⁷, S. Choudhury³⁶, D. Cinabro⁸⁹, S. Cunliffe⁹, N. Dash²⁸, G. De Nardo^33,57, G. De Pietro³⁴, R. Dhamija²⁷, F. Di Capua^33,57, J. Dingfelder², Z. Doležal⁵, T. V. Dong¹⁰, T. Ferber⁹, D. Ferlewicz⁵³, B. G. Fulsom⁶⁶, R. Garg⁶⁷, V. Gaur⁸⁸, N. Gabyshev^4,64, A. Giri²⁷, P. Goldenzweig³⁹, B. Golob^47,38, E. Graziani³⁴, K. Gudkova^4,64, C. Hadjivasiliou⁶⁶, T. Hara^19,15, K. Hayasaka⁶³, H. Hayashii⁵⁸, M. T. Hedges¹⁸, W.-S. Hou⁶⁰, K. Inami⁵⁶, G. Inguglia³¹, A. Ishikawa^19,15, R. Itoh^19,15, M. Iwasaki⁶⁵, Y. Iwasaki¹⁹, W. W. Jacobs²⁹, E.-J. Jang¹⁶, S. Jia¹³, Y. Jin⁸⁵, K. K. Joo⁶, J. Kahn³⁹, K. H. Kang⁴⁰, T. Kawasaki⁴², H. Kichimi¹⁹, C. Kiesling⁵², C. H. Kim¹⁷, D. Y. Kim⁷⁶, K.-H. Kim⁹¹, K. T. Kim⁴⁴, Y.-K. Kim⁹¹, K. Kinoshita⁸, P. Kodyš⁵, T. Konno⁴², A. Korobov^4,64, S. Korpar^51,38, E. Kovalenko^4,64, P. Križan^47,38, R. Kroeger⁵⁴, P. Krokovny^4,64, M. Kumar⁵⁰, R. Kumar⁶⁹, K. Kumara⁸⁹, A. Kuzmin^4,64,46, Y.-J. Kwon⁹¹, K. Lalwani⁵⁰, T. Lam⁸⁸, M. Laurenza^34,72, S. C. Lee⁴⁵, J. Li⁴⁵, L. K. Li⁸, Y. Li¹³, L. Li Gioi⁵², J. Libby²⁸, K. Lieret⁴⁸, D. Liventsev^89,19, A. Martini⁹, M. Masuda^84,70, D. Matvienko^4,64,46, S. K. Maurya²⁶, M. Merola^33,57, K. Miyabayashi⁵⁸, R. Mizuk^46,21, G. B. Mohanty⁸⁰, M. Nakao^19,15, D. Narwal²⁶, A. Natochii¹⁸, L. Nayak²⁷, M. Nayak⁸², N. K. Nisar³, S. Nishida^19,15, K. Ogawa⁶³, S. Ogawa⁸³, H. Ono^62,63, P. Oskin⁴⁶, P. Pakhlov^46,55, G. Pakhlova^21,46, T. Pang⁶⁸, S. Pardi³³, S.-H. Park¹⁹, S. Patra²⁴, S. Paul^81,52, T. K. Pedlar⁴⁹, R. Pestotnik³⁸, L. E. Piilonen⁸⁸, T. Podobnik^47,38, E. Prencipe²², M. T. Prim², M. Röhrken⁹, A. Rostomyan⁹, N. Rout²⁸, G. Russo⁵⁷, D. Sahoo³⁶, S. Sandilya²⁷, A. Sangal⁸, L. Santelj^47,38, V. Savinov⁶⁸, G. Schnell^1,23, J. Schueler¹⁸, C. Schwanda³¹, Y. Seino⁶³, K. Senyo⁹⁰, M. E. Sevior⁵³, M. Shapkin³², C. Sharma⁵⁰, V. Shebalin¹⁸, J.-G. Shiu⁶⁰, B. Shwartz^4,64, J. B. Singh^67,*, A. Sokolov³², E. Solovieva⁴⁶, M. Starič³⁸, Z. S. Stottler⁸⁸, M. Sumihama^14,70, T. Sumiyoshi⁸⁷, M. Takizawa^74,20,71, U. Tamponi³⁵, K. Tanida³⁷, F. Tenchini⁹, M. Uchida⁸⁶, T. Uglov^46,21, Y. Unno¹⁷, K. Uno⁶³, S. Uno^19,15, P. Urquijo⁵³, S. E. Vahsen¹⁸, R. Van Tonder², G. Varner¹⁸, A. Vinokurova^4,64, E. Waheed¹⁹, D. Wang¹¹, E. Wang⁶⁸, M.-Z. Wang⁶⁰, S. Watanuki⁹¹, E. Won⁴⁴, X. Xu⁷⁵, B. D. Yabsley⁷⁸, W. Yan⁷³, S. B. Yang⁴⁴, H. Ye⁹, J. Yelton¹¹, J. H. Yin⁴⁴, C. Z. Yuan³⁰, Y. Yusa⁶³, Y. Zhai³⁶, Z. P. Zhang⁷³, V. Zhilich^4,64, and V. Zhukova⁴⁶ (The 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
⁶Chonnam National University, Gwangju 61186
⁷Chung-Ang University, Seoul 06974
⁸University of Cincinnati, Cincinnati, Ohio 45221
⁹Deutsches Elektronen–Synchrotron, 22607 Hamburg
¹⁰Institute of Theoretical and Applied Research (ITAR), Duy Tan University, Hanoi 100000
¹¹University of Florida, Gainesville, Florida 32611
¹²Department of Physics, Fu Jen Catholic University, Taipei 24205
¹³Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
¹⁴Gifu University, Gifu 501-1193
¹⁵SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
¹⁶Gyeongsang National University, Jinju 52828
¹⁷Department of Physics and Institute of Natural Sciences, Hanyang University, Seoul 04763
¹⁸University of Hawaii, Honolulu, Hawaii 96822
¹⁹High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
²⁰J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
²¹National Research University Higher School of Economics, Moscow 101000
²²Forschungszentrum Jülich, 52425 Jülich
²³IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
²⁴Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
²⁵Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
²⁶Indian Institute of Technology Guwahati, Assam 781039
²⁷Indian Institute of Technology Hyderabad, Telangana 502285
²⁸Indian Institute of Technology Madras, Chennai 600036
²⁹Indiana University, Bloomington, Indiana 47408
³⁰Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
³¹Institute of High Energy Physics, Vienna 1050
³²Institute for High Energy Physics, Protvino 142281
³³INFN—Sezione di Napoli, I-80126 Napoli
³⁴INFN—Sezione di Roma Tre, I-00146 Roma
³⁵INFN—Sezione di Torino, I-10125 Torino
³⁶Iowa State University, Ames, Iowa 50011
³⁷Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
³⁸J. Stefan Institute, 1000 Ljubljana
³⁹Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
⁴⁰Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583
⁴¹Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
⁴²Kitasato University, Sagamihara 252-0373
⁴³Korea Institute of Science and Technology Information, Daejeon 34141
⁴⁴Korea University, Seoul 02841
⁴⁵Kyungpook National University, Daegu 41566
⁴⁶P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
⁴⁷Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
⁴⁸Ludwig Maximilians University, 80539 Munich
⁴⁹Luther College, Decorah, Iowa 52101
⁵⁰Malaviya National Institute of Technology Jaipur, Jaipur 302017
⁵¹Faculty of Chemistry and Chemical Engineering, University of Maribor, 2000 Maribor
⁵²Max-Planck-Institut für Physik, 80805 München
⁵³School of Physics, University of Melbourne, Victoria 3010
⁵⁴University of Mississippi, University, Mississippi 38677
⁵⁵Moscow Physical Engineering Institute, Moscow 115409
⁵⁶Graduate School of Science, Nagoya University, Nagoya 464-8602
⁵⁷Università di Napoli Federico II, I-80126 Napoli
⁵⁸Nara Women’s University, Nara 630-8506
⁵⁹National Central University, Chung-li 32054
⁶⁰Department of Physics, National Taiwan University, Taipei 10617
⁶¹H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
⁶²Nippon Dental University, Niigata 951-8580
⁶³Niigata University, Niigata 950-2181
⁶⁴Novosibirsk State University, Novosibirsk 630090
⁶⁵Osaka City University, Osaka 558-8585
⁶⁶Pacific Northwest National Laboratory, Richland, Washington 99352
⁶⁷Panjab University, Chandigarh 160014
⁶⁸University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁶⁹Punjab Agricultural University, Ludhiana 141004
⁷⁰Research Center for Nuclear Physics, Osaka University, Osaka 567-0047
⁷¹Meson Science Laboratory, Cluster for Pioneering Research, RIKEN, Saitama 351-0198
⁷²Dipartimento di Matematica e Fisica, Università di Roma Tre, I-00146 Roma
⁷³Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026
⁷⁴Showa Pharmaceutical University, Tokyo 194-8543
⁷⁵Soochow University, Suzhou 215006
⁷⁶Soongsil University, Seoul 06978
⁷⁷Sungkyunkwan University, Suwon 16419
⁷⁸School of Physics, University of Sydney, New South Wales 2006
⁷⁹Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
⁸⁰Tata Institute of Fundamental Research, Mumbai 400005
⁸¹Department of Physics, Technische Universität München, 85748 Garching
⁸²School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978
⁸³Toho University, Funabashi 274-8510
⁸⁴Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
⁸⁵Department of Physics, University of Tokyo, Tokyo 113-0033
⁸⁶Tokyo Institute of Technology, Tokyo 152-8550
⁸⁷Tokyo Metropolitan University, Tokyo 192-0397
⁸⁸Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁸⁹Wayne State University, Detroit, Michigan 48202
⁹⁰Yamagata University, Yamagata 990-8560
⁹¹Yonsei University, Seoul 03722

^*University of Petroleum and Energy Studies, Dehradun 248007.

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Phys. Rev. D 105, L091101 – Published 16 May, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L091101

Abstract

We present the first observation of the $Ω_{c}^{0} \to Ω^{-} μ^{+} ν_{μ}$ decay and present measurements of the branching fraction ratios of the $Ω_{c}^{0} \to Ω^{-} ℓ^{+} ν_{ℓ}$ decays compared to the reference mode $Ω_{c}^{0} \to Ω^{-} π^{+}$ , ( $ℓ = e$ or $μ$ ). This analysis is based on $89.5 {fb}^{- 1}$ , $711 {fb}^{- 1}$ , and $121.1 {fb}^{- 1}$ data samples collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider at the center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.86 GeV, respectively. The $Ω_{c}^{0}$ signal yields are extracted by fitting $M_{Ω ℓ}$ and $M_{Ω π}$ spectra. The branching fraction ratios $B (Ω_{c}^{0} \to Ω^{-} e^{+} ν_{e}) / B (Ω_{c}^{0} \to Ω^{-} π^{+})$ and $B (Ω_{c}^{0} \to Ω^{-} μ^{+} ν_{μ}) / B (Ω_{c}^{0} \to Ω^{-} π^{+})$ are measured to be $1.98 \pm 0.13 (stat) \pm 0.08 (syst)$ and $1.94 \pm 0.18 (stat) \pm 0.10 (syst)$ , respectively. The ratio of $B (Ω_{c}^{0} \to Ω^{-} e^{+} ν_{e}) / B (Ω_{c}^{0} \to Ω^{-} μ^{+} ν_{μ})$ is measured to be $1.02 \pm 0.10 (stat) \pm 0.02 (syst)$ , which is consistent with the expectation of lepton flavor universality.

Physics Subject Headings (PhySH)

Corrections

23 May, 2022

Correction: The title was altered incorrectly during the review process and has been fixed.

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Phys. Rev. D 105, L091101– Published 16 May, 2022

Vol. 105, Iss. 9 — 1 May 2022

Received 20 December 2021
Accepted 26 April 2022
Corrected 23 May 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L091101

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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First test of lepton flavor universality in the charmed baryon decays $Ω_{c}^{0} \to Ω^{-} ℓ^{+} ν_{ℓ}$ using data of the Belle experiment

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First test of lepton flavor universality in the charmed baryon decays Ωc0→Ω−ℓ+νℓ using data of the Belle experiment

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References (44)

First test of lepton flavor universality in the charmed baryon decays $Ω_{c}^{0} \to Ω^{-} ℓ^{+} ν_{ℓ}$ using data of the Belle experiment