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Measurement of $η^{'} \to π^{+} π^{-} e^{+} e^{-}$ and $η^{'} \to π^{+} π^{-} μ^{+} μ^{-}$

M. Ablikim¹, M. N. Achasov⁶, O. Albayrak³, D. J. Ambrose³⁹, F. F. An¹, Q. An⁴⁰, J. Z. Bai¹, R. Baldini Ferroli^17a, Y. Ban²⁶ et al. (BESIII Collaboration)

Y. Ban²⁶, J. Becker², J. V. Bennett¹⁶, M. Bertani^17a, J. M. Bian³⁸, E. Boger^19,*, O. Bondarenko²⁰, I. Boyko¹⁹, R. A. Briere³, V. Bytev¹⁹, H. Cai⁴⁴, X. Cai¹, O. Cakir^34a, A. Calcaterra^17a, G. F. Cao¹, S. A. Cetin^34b, J. F. Chang¹, G. Chelkov^19,*, G. Chen¹, H. S. Chen¹, J. C. Chen¹, M. L. Chen¹, S. J. Chen²⁴, X. Chen²⁶, Y. B. Chen¹, H. P. Cheng¹⁴, Y. P. Chu¹, D. Cronin-Hennessy³⁸, H. L. Dai¹, J. P. Dai¹, D. Dedovich¹⁹, Z. Y. Deng¹, A. Denig¹⁸, I. Denysenko^19,†, M. Destefanis^43a,43c, W. M. Ding²⁸, Y. Ding²², L. Y. Dong¹, M. Y. Dong¹, S. X. Du⁴⁶, J. Fang¹, S. S. Fang¹, L. Fava^43b,43c, C. Q. Feng⁴⁰, P. Friedel², C. D. Fu¹, J. L. Fu²⁴, O. Fuks^19,*, Y. Gao³³, C. Geng⁴⁰, K. Goetzen⁷, W. X. Gong¹, W. Gradl¹⁸, M. Greco^43a,43c, M. H. Gu¹, Y. T. Gu⁹, Y. H. Guan³⁶, A. Q. Guo²⁵, L. B. Guo²³, T. Guo²³, Y. P. Guo²⁵, Y. L. Han¹, F. A. Harris³⁷, K. L. He¹, M. He¹, Z. Y. He²⁵, T. Held², Y. K. Heng¹, Z. L. Hou¹, C. Hu²³, H. M. Hu¹, J. F. Hu³⁵, T. Hu¹, G. M. Huang⁴, G. S. Huang⁴⁰, J. S. Huang¹², L. Huang¹, X. T. Huang²⁸, Y. Huang²⁴, Y. P. Huang¹, T. Hussain⁴², C. S. Ji⁴⁰, Q. Ji¹, Q. P. Ji²⁵, X. B. Ji¹, X. L. Ji¹, L. L. Jiang¹, X. S. Jiang¹, J. B. Jiao²⁸, Z. Jiao¹⁴, D. P. Jin¹, S. Jin¹, F. F. Jing³³, N. Kalantar-Nayestanaki²⁰, M. Kavatsyuk²⁰, B. Kopf², M. Kornicer³⁷, W. Kuehn³⁵, W. Lai¹, J. S. Lange³⁵, P. Larin¹¹, M. Leyhe², C. H. Li¹, Cheng Li⁴⁰, Cui Li⁴⁰, D. M. Li⁴⁶, F. Li¹, G. Li¹, H. B. Li¹, J. C. Li¹, K. Li¹⁰, Lei Li¹, Q. J. Li¹, S. L. Li¹, W. D. Li¹, W. G. Li¹, X. L. Li²⁸, X. N. Li¹, X. Q. Li²⁵, X. R. Li²⁷, Z. B. Li³², H. Liang⁴⁰, Y. F. Liang³⁰, Y. T. Liang³⁵, G. R. Liao³³, X. T. Liao¹, D. Lin¹¹, B. J. Liu¹, C. L. Liu³, C. X. Liu¹, F. H. Liu²⁹, Fang Liu¹, Feng Liu⁴, H. Liu¹, H. B. Liu⁹, H. H. Liu¹³, H. M. Liu¹, H. W. Liu¹, J. P. Liu⁴⁴, K. Liu³³, K. Y. Liu²², Kai Liu³⁶, P. L. Liu²⁸, Q. Liu³⁶, S. B. Liu⁴⁰, X. Liu²¹, Y. B. Liu²⁵, Z. A. Liu¹, Zhiqiang Liu¹, Zhiqing Liu¹, H. Loehner²⁰, G. R. Lu¹², H. J. Lu¹⁴, J. G. Lu¹, Q. W. Lu²⁹, X. R. Lu³⁶, Y. P. Lu¹, C. L. Luo²³, M. X. Luo⁴⁵, T. Luo³⁷, X. L. Luo¹, M. Lv¹, C. L. Ma³⁶, F. C. Ma²², H. L. Ma¹, Q. M. Ma¹, S. Ma¹, T. Ma¹, X. Y. Ma¹, F. E. Maas¹¹, M. Maggiora^43a,43c, Q. A. Malik⁴², Y. J. Mao²⁶, Z. P. Mao¹, J. G. Messchendorp²⁰, J. Min¹, T. J. Min¹, R. E. Mitchell¹⁶, X. H. Mo¹, H. Moeini²⁰, C. Morales Morales¹¹, K. Moriya¹⁶, N. Yu. Muchnoi⁶, H. Muramatsu³⁹, Y. Nefedov¹⁹, C. Nicholson³⁶, I. B. Nikolaev⁶, Z. Ning¹, S. L. Olsen²⁷, Q. Ouyang¹, S. Pacetti^17b, J. W. Park²⁷, M. Pelizaeus², H. P. Peng⁴⁰, K. Peters⁷, J. L. Ping²³, R. G. Ping¹, R. Poling³⁸, E. Prencipe¹⁸, M. Qi²⁴, S. Qian¹, C. F. Qiao³⁶, L. Q. Qin²⁸, X. S. Qin¹, Y. Qin²⁶, Z. H. Qin¹, J. F. Qiu¹, K. H. Rashid⁴², G. Rong¹, X. D. Ruan⁹, A. Sarantsev^19,‡, B. D. Schaefer¹⁶, M. Shao⁴⁰, C. P. Shen^37,§, X. Y. Shen¹, H. Y. Sheng¹, M. R. Shepherd¹⁶, W. M. Song¹, X. Y. Song¹, S. Spataro^43a,43c, B. Spruck³⁵, D. H. Sun¹, G. X. Sun¹, J. F. Sun¹², S. S. Sun¹, Y. J. Sun⁴⁰, Y. Z. Sun¹, Z. J. Sun¹, Z. T. Sun⁴⁰, C. J. Tang³⁰, X. Tang¹, I. Tapan^34c, E. H. Thorndike³⁹, D. Toth³⁸, M. Ullrich³⁵, I. Uman^34b, G. S. Varner³⁷, B. Q. Wang²⁶, D. Wang²⁶, D. Y. Wang²⁶, K. Wang¹, L. L. Wang¹, L. S. Wang¹, M. Wang²⁸, P. Wang¹, P. L. Wang¹, Q. J. Wang¹, S. G. Wang²⁶, X. F. Wang³³, X. L. Wang⁴⁰, Y. D. Wang^17a, Y. F. Wang¹, Y. Q. Wang¹⁸, Z. Wang¹, Z. G. Wang¹, Z. Y. Wang¹, D. H. Wei⁸, J. B. Wei²⁶, P. Weidenkaff¹⁸, Q. G. Wen⁴⁰, S. P. Wen¹, M. Werner³⁵, U. Wiedner², L. H. Wu¹, N. Wu¹, S. X. Wu⁴⁰, W. Wu²⁵, Z. Wu¹, L. G. Xia³³, Y. X. Xia¹⁵, Z. J. Xiao²³, Y. G. Xie¹, Q. L. Xiu¹, G. F. Xu¹, G. M. Xu²⁶, Q. J. Xu¹⁰, Q. N. Xu³⁶, X. P. Xu³¹, Z. R. Xu⁴⁰, F. Xue⁴, Z. Xue¹, L. Yan⁴⁰, W. B. Yan⁴⁰, Y. H. Yan¹⁵, H. X. Yang¹, Y. Yang⁴, Y. X. Yang⁸, H. Ye¹, M. Ye¹, M. H. Ye⁵, B. X. Yu¹, C. X. Yu²⁵, H. W. Yu²⁶, J. S. Yu²¹, S. P. Yu²⁸, C. Z. Yuan¹, Y. Yuan¹, A. A. Zafar⁴², A. Zallo^17a, S. L. Zang²⁴, Y. Zeng¹⁵, B. X. Zhang¹, B. Y. Zhang¹, C. Zhang²⁴, C. C. Zhang¹, D. H. Zhang¹, H. H. Zhang³², H. Y. Zhang¹, J. Q. Zhang¹, J. W. Zhang¹, J. Y. Zhang¹, J. Z. Zhang¹, LiLi Zhang¹⁵, R. Zhang³⁶, S. H. Zhang¹, X. J. Zhang¹, X. Y. Zhang²⁸, Y. Zhang¹, Y. H. Zhang¹, Z. P. Zhang⁴⁰, Z. Y. Zhang⁴⁴, Zhenghao Zhang⁴, G. Zhao¹, H. S. Zhao¹, J. W. Zhao¹, K. X. Zhao²³, Lei Zhao⁴⁰, Ling Zhao¹, M. G. Zhao²⁵, Q. Zhao¹, S. J. Zhao⁴⁶, T. C. Zhao¹, X. H. Zhao²⁴, Y. B. Zhao¹, Z. G. Zhao⁴⁰, A. Zhemchugov^19,*, B. Zheng⁴¹, J. P. Zheng¹, Y. H. Zheng³⁶, B. Zhong²³, L. Zhou¹, X. Zhou⁴⁴, X. K. Zhou³⁶, X. R. Zhou⁴⁰, C. Zhu¹, K. Zhu¹, K. J. Zhu¹, S. H. Zhu¹, X. L. Zhu³³, Y. C. Zhu⁴⁰, Y. M. Zhu²⁵, Y. S. Zhu¹, Z. A. Zhu¹, J. Zhuang¹, B. S. Zou¹, and J. H. Zou¹ (BESIII Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People’s Republic of China
²Bochum Ruhr-University, D-44780 Bochum, Germany
³Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁴Central China Normal University, Wuhan 430079, People’s Republic of China
⁵China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
⁶G. I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
⁷GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
⁸Guangxi Normal University, Guilin 541004, People’s Republic of China
⁹GuangXi University, Nanning 530004, People’s Republic of China
¹⁰Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
¹¹Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, Mainz D-55099, Germany
¹²Henan Normal University, Xinxiang 453007, People’s Republic of China
¹³Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
¹⁴Huangshan College, Huangshan 245000, People’s Republic of China
¹⁵Hunan University, Changsha 410082, People’s Republic of China
¹⁶Indiana University, Bloomington, Indiana 47405, USA
^17aINFN Laboratori Nazionali di Frascati, Frascati I-00044, Italy
^17bINFN and University of Perugia, Perugia I-06100, Italy
¹⁸Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, Mainz D-55099, Germany
¹⁹Joint Institute for Nuclear Research, Dubna 141980, Moscow region, Russia
²⁰KVI, University of Groningen, NL-9747 AA Groningen, The Netherlands
²¹Lanzhou University, Lanzhou 730000, People’s Republic of China
²²Liaoning University, Shenyang 110036, People’s Republic of China
²³Nanjing Normal University, Nanjing 210023, People’s Republic of China
²⁴Nanjing University, Nanjing 210093, People’s Republic of China
²⁵Nankai University, Tianjin 300071, People’s Republic of China
²⁶Peking University, Beijing 100871, People’s Republic of China
²⁷Seoul National University, Seoul 151-747, Korea
²⁸Shandong University, Jinan 250100, People’s Republic of China
²⁹Shanxi University, Taiyuan 030006, People’s Republic of China
³⁰Sichuan University, Chengdu 610064, People’s Republic of China
³¹Soochow University, Suzhou 215006, People’s Republic of China
³²Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
³³Tsinghua University, Beijing 100084, People’s Republic of China
^34aAnkara University, Dogol Caddesi, Tandogan 06100, Ankara, Turkey
^34bDogus University, Istanbul 34722, Turkey
^34cUludag University, Bursa 16059, Turkey
³⁵Universitaet Giessen, Giessen D-35392, Germany
³⁶University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
³⁷University of Hawaii, Honolulu, Hawaii 96822, USA
³⁸University of Minnesota, Minneapolis, Minnesota 55455, USA
³⁹University of Rochester, Rochester, New York 14627, USA
⁴⁰University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁴¹University of South China, Hengyang 421001, People’s Republic of China
⁴²University of the Punjab, Lahore 54590, Pakistan
^43aUniversity of Turin, Turin I-10125, Italy
^43bUniversity of Eastern Piedmont, Alessandria I-15121, Italy
^43cINFN, Turin I-10125, Italy
⁴⁴Wuhan University, Wuhan 430072, People’s Republic of China
⁴⁵Zhejiang University, Hangzhou 310027, People’s Republic of China
⁴⁶Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^*Also at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^†On leave from the Bogolyubov Institute for Theoretical Physics, Kiev 03680, Ukraine.
^‡Also at the PNPI, Gatchina 188300, Russia.
^§Present address: Nagoya University, Nagoya 464-8601, Japan.

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Phys. Rev. D 87, 092011 – Published 28 May, 2013

DOI: https://doi.org/10.1103/PhysRevD.87.092011

Abstract

Based on a sample of 225.3 million $J / ψ$ events accumulated with the BESIII detector at the BEPCII, the decays of $η^{'} \to π^{+} π^{-} l^{+} l^{-}$ are studied via $J / ψ \to γ η^{'}$ . A clear $η^{'}$ signal is observed in the $π^{+} π^{-} e^{+} e^{-}$ mass spectrum, and the branching fraction is measured to be $B (η^{'} \to π^{+} π^{-} e^{+} e^{-}) = (2.11 \pm 0.12 (stat) \pm 0.14 (syst)) \times 10^{- 3}$ , which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No $η^{'}$ signal is found in the $π^{+} π^{-} μ^{+} μ^{-}$ mass spectrum, and the upper limit is determined to be $B (η^{'} \to π^{+} π^{-} μ^{+} μ^{-}) < 2.9 \times 10^{- 5}$ at the 90% confidence level.

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References (23)

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Measurement of $η^{'} \to π^{+} π^{-} e^{+} e^{-}$ and $η^{'} \to π^{+} π^{-} μ^{+} μ^{-}$

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Measurement of η′→π+π−e+e− and η′→π+π−μ+μ−

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Measurement of $η^{'} \to π^{+} π^{-} e^{+} e^{-}$ and $η^{'} \to π^{+} π^{-} μ^{+} μ^{-}$