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  • Letter
  • Open Access

Search for invisible decays of the Λ baryon

M. Ablikim1, M. N. Achasov10,b, P. Adlarson66, S. Ahmed14, M. Albrecht4, R. Aliberti27, A. Amoroso65a,65c, M. R. An31, Q. An62,48 et al. (BESIII Collaboration)

Q. An62,48, X. H. Bai56, Y. Bai47, O. Bakina28, R. Baldini Ferroli22a, I. Balossino23a, Y. Ban37,h, K. Begzsuren25, N. Berger27, M. Bertani22a, D. Bettoni23a, F. Bianchi65a,65c, J. Bloms59, A. Bortone65a,65c, I. Boyko28, R. A. Briere5, H. Cai67, X. Cai1,48, A. Calcaterra22a, G. F. Cao1,53, N. Cao1,53, S. A. Cetin52a, J. F. Chang1,48, W. L. Chang1,53, G. Chelkov28,a, D. Y. Chen6, G. Chen1, H. S. Chen1,53, M. L. Chen1,48, S. J. Chen34, X. R. Chen24, Y. B. Chen1,48, Z. J. Chen19,i, W. S. Cheng65c, G. Cibinetto23a, F. Cossio65c, X. F. Cui35, H. L. Dai1,48, X. C. Dai1,53, A. Dbeyssi14, R. E. de Boer4, D. Dedovich28, Z. Y. Deng1, A. Denig27, I. Denysenko28, M. Destefanis65a,65c, F. De Mori65a,65c, Y. Ding32, C. Dong35, J. Dong1,48, L. Y. Dong1,53, M. Y. Dong1,48,53, X. Dong67, S. X. Du70, Y. L. Fan67, J. Fang1,48, S. S. Fang1,53, Y. Fang1, R. Farinelli23a, L. Fava65b,65c, F. Feldbauer4, G. Felici22a, C. Q. Feng62,48, J. H. Feng49, M. Fritsch4, C. D. Fu1, Y. Gao63, Y. Gao62,48, Y. Gao37,h, Y. G. Gao6, I. Garzia23a,23b, P. T. Ge67, C. Geng49, E. M. Gersabeck57, A. Gilman60, K. Goetzen11, L. Gong32, W. X. Gong1,48, W. Gradl27, M. Greco65a,65c, L. M. Gu34, M. H. Gu1,48, C. Y. Guan1,53, A. Q. Guo21, L. B. Guo33, R. P. Guo39, Y. P. Guo9,f, A. Guskov28,a, T. T. Han40, W. Y. Han31, X. Q. Hao15, F. A. Harris55, K. L. He1,53, F. H. Heinsius4, C. H. Heinz27, Y. K. Heng1,48,53, C. Herold50, M. Himmelreich11,d, T. Holtmann4, G. Y. Hou1,53, Y. R. Hou53, Z. L. Hou1, H. M. Hu1,53, J. F. Hu46,j, T. Hu1,48,53, Y. Hu1, G. S. Huang62,48, L. Q. Huang63, X. T. Huang40, Y. P. Huang1, Z. Huang37,h, T. Hussain64, N. Hüsken21,27, W. Ikegami Andersson66, W. Imoehl21, M. Irshad62,48, S. Jaeger4, S. Janchiv25, Q. Ji1, Q. P. Ji15, X. B. Ji1,53, X. L. Ji1,48, Y. Y. Ji40, H. B. Jiang40, X. S. Jiang1,48,53, J. B. Jiao40, Z. Jiao17, S. Jin34, Y. Jin56, M. Q. Jing1,53, T. Johansson66, N. Kalantar-Nayestanaki54, X. S. Kang32, R. Kappert54, M. Kavatsyuk54, B. C. Ke42,1, I. K. Keshk4, A. 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Thoren66, W. H. Tian42, Y. T. Tian24, I. Uman52b, B. Wang1, C. W. Wang34, D. Y. Wang37,h, H. J. Wang30,k,l, H. P. Wang1,53, K. Wang1,48, L. L. Wang1, M. Wang40, M. Z. Wang37,h, Meng Wang1,53, S. Wang9,f, W. Wang49, W. H. Wang67, W. P. Wang62,48, X. Wang37,h, X. F. Wang30,k,l, X. L. Wang9,f, Y. Wang49, Y. Wang62,48, Y. D. Wang36, Y. F. Wang1,48,53, Y. Q. Wang1, Y. Y. Wang30,k,l, Z. Wang1,48, Z. Y. Wang1, Ziyi Wang53, Zongyuan Wang1,53, D. H. Wei12, F. Weidner59, S. P. Wen1, D. J. White57, U. Wiedner4, G. Wilkinson60, M. Wolke66, L. Wollenberg4, J. F. Wu1,53, L. H. Wu1, L. J. Wu1,53, X. Wu9,f, Z. Wu1,48, L. Xia62,48, H. Xiao9,f, S. Y. Xiao1, Z. J. Xiao33, X. H. Xie37,h, Y. G. Xie1,48, Y. H. Xie6, T. Y. Xing1,53, C. J. Xu49, G. F. Xu1, Q. J. Xu13, W. Xu1,53, X. P. Xu45, Y. C. Xu53, F. Yan9,f, L. Yan9,f, W. B. Yan62,48, W. C. Yan70, Xu Yan45, H. J. Yang41,e, H. X. Yang1, L. Yang42, S. L. Yang53, Y. X. Yang12, Yifan Yang1,53, Zhi Yang24, M. Ye1,48, M. H. Ye7, J. H. Yin1, Z. Y. You49, B. X. 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Zhu61, T. J. Zhu68, W. J. Zhu9,f, W. J. Zhu35, Y. C. Zhu62,48, Z. A. Zhu1,53, B. S. Zou1, and J. H. Zou1 (BESIII Collaboration)

  • 1Institute of High Energy Physics, Beijing 100049, People’s Republic of China
  • 2Beihang University, Beijing 100191, People’s Republic of China
  • 3Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China
  • 4Bochum Ruhr-University, D-44780 Bochum, Germany
  • 5Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 6Central China Normal University, Wuhan 430079, People’s Republic of China
  • 7China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
  • 8COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
  • 9Fudan University, Shanghai 200443, People’s Republic of China
  • 10G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
  • 11GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
  • 12Guangxi Normal University, Guilin 541004, People’s Republic of China
  • 13Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
  • 14Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
  • 15Henan Normal University, Xinxiang 453007, People’s Republic of China
  • 16Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
  • 17Huangshan College, Huangshan 245000, People’s Republic of China
  • 18Hunan Normal University, Changsha 410081, People’s Republic of China
  • 19Hunan University, Changsha 410082, People’s Republic of China
  • 20Indian Institute of Technology Madras, Chennai 600036, India
  • 21Indiana University, Bloomington, Indiana 47405, USA
  • 22aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
  • 22bINFN Sezione di Perugia, I-06100, Perugia, Italy
  • 22cUniversity of Perugia, I-06100, Perugia, Italy
  • 23aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
  • 23bUniversity of Ferrara, I-44122, Ferrara, Italy
  • 24Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
  • 25Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
  • 26Jilin University, Changchun 130012, People’s Republic of China
  • 27Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
  • 28Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
  • 29Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
  • 30Lanzhou University, Lanzhou 730000, People’s Republic of China
  • 31Liaoning Normal University, Dalian 116029, People’s Republic of China
  • 32Liaoning University, Shenyang 110036, People’s Republic of China
  • 33Nanjing Normal University, Nanjing 210023, People’s Republic of China
  • 34Nanjing University, Nanjing 210093, People’s Republic of China
  • 35Nankai University, Tianjin 300071, People’s Republic of China
  • 36North China Electric Power University, Beijing 102206, People’s Republic of China
  • 37Peking University, Beijing 100871, People’s Republic of China
  • 38Qufu Normal University, Qufu 273165, People’s Republic of China
  • 39Shandong Normal University, Jinan 250014, People’s Republic of China
  • 40Shandong University, Jinan 250100, People’s Republic of China
  • 41Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
  • 42Shanxi Normal University, Linfen 041004, People’s Republic of China
  • 43Shanxi University, Taiyuan 030006, People’s Republic of China
  • 44Sichuan University, Chengdu 610064, People’s Republic of China
  • 45Soochow University, Suzhou 215006, People’s Republic of China
  • 46South China Normal University, Guangzhou 510006, People’s Republic of China
  • 47Southeast University, Nanjing 211100, People’s Republic of China
  • 48State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
  • 49Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
  • 50Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
  • 51Tsinghua University, Beijing 100084, People’s Republic of China
  • 52aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey
  • 52bNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
  • 53University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 54University of Groningen, NL-9747 AA Groningen, Netherlands
  • 55University of Hawaii, Honolulu, Hawaii 96822, USA
  • 56University of Jinan, Jinan 250022, People’s Republic of China
  • 57University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
  • 58University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 59University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Muenster, Germany
  • 60University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
  • 61University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
  • 62University of Science and Technology of China, Hefei 230026, People’s Republic of China
  • 63University of South China, Hengyang 421001, People’s Republic of China
  • 64University of the Punjab, Lahore-54590, Pakistan
  • 65aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy
  • 65bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
  • 65cINFN, I-10125, Turin, Italy
  • 66Uppsala University, Box 516, SE-75120 Uppsala, Sweden
  • 67Wuhan University, Wuhan 430072, People’s Republic of China
  • 68Xinyang Normal University, Xinyang 464000, People’s Republic of China
  • 69Zhejiang University, Hangzhou 310027, People’s Republic of China
  • 70Zhengzhou University, Zhengzhou 450001, People’s Republic of China

  • aAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
  • bAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
  • cAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
  • dAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
  • eAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
  • fAlso at Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, People’s Republic of China.
  • gAlso at Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.
  • hAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
  • iAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
  • jAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
  • kAlso at Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
  • lAlso at Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People’s Republic of China.
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Phys. Rev. D 105, L071101 – Published 19 April, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L071101

Abstract

A search for invisible decays of the Λ baryon is carried out in the process J/ψ→ΛΛ¯ based on (1.0087±0.0044)×1010  J/ψ events collected with the BESIII detector located at the BEPCII storage ring. No signals are found for the invisible decays of Λ baryon, and the upper limit of the branching fraction is determined to be 7.4×10−5 at the 90% confidence level. This is the first search for invisible decays of baryons; such searches will play an important role in constraining dark sector models related to the baryon asymmetry.

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Outline

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Phys. Rev. D 105, L071101– Published 19 April, 2022
  • Received 14 October 2021
  • Accepted 22 March 2022
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