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Phys Rev Lett. 2017 Jun 2;118(22):221802. doi: 10.1103/PhysRevLett.118.221802. Epub 2017 May 30.

Observation of ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ.

Ablikim M1, Achasov MN2, Ai XC1, Albayrak O3, Albrecht M4, Ambrose DJ5, Amoroso A6,7, An FF1, An Q8, Bai JZ1, Baldini Ferroli R9, Ban Y10, Bennett DW11, Bennett JV3, Bertani M9, Bettoni D12, Bian JM13, Bianchi F6,7, Boger E14, Boyko I14, Briere RA3, Cai H15, Cai X1, Cakir O16, Calcaterra A9, Cao GF1, Cetin SA17, Chang JF1, Chelkov G14, Chen G1, Chen HS1, Chen HY18, Chen JC1, Chen ML1, Chen S19, Chen SJ20, Chen X1, Chen XR21, Chen YB1, Cheng HP22, Chu XK10, Cibinetto G12, Dai HL1, Dai JP23, Dbeyssi A24, Dedovich D14, Deng ZY1, Denig A25, Denysenko I14, Destefanis M6,7, De Mori F6,7, Ding Y26, Dong C27, Dong J1, Dong LY1, Dong MY1, Dou ZL20, Du SX28, Duan PF1, Fan JZ29, Fang J1, Fang SS1, Fang X8, Fang Y1, Farinelli R12,30, Fava L31,7, Fedorov O14, Feldbauer F25, Felici G9, Feng CQ8, Fioravanti E12, Fritsch M24,25, Fu CD1, Gao Q1, Gao XL8, Gao XY18, Gao Y29, Gao Z8, Garzia I12, Goetzen K32, Gong L27, Gong WX1, Gradl W25, Greco M6,7, Gu MH1, Gu YT33, Guan YH1, Guo AQ1, Guo LB34, Guo RP1, Guo Y1, Guo YP25, Haddadi Z35, Hafner A25, Han S15, Hao XQ36, Harris FA37, He KL1, Held T4, Heng YK1, Hou ZL1, Hu C34, Hu HM1, Hu JF6,7, Hu T1, Hu Y1, Huang GS8, Huang JS36, Huang XT38, Huang XZ20, Huang Y20, Huang ZL26, Hussain T39, Ji Q1, Ji QP27, Ji XB1, Ji XL1, Jiang LW15, Jiang XS1, Jiang XY27, Jiao JB38, Jiao Z22, Jin DP1, Jin S1, Johansson T40, Julin A13, Kalantar-Nayestanaki N35, Kang XL1, Kang XS27, Kavatsyuk M35, Ke BC3, Kiese P25, Kliemt R24, Kloss B25, Kolcu OB17, Kopf B4, Kornicer M37, Kupsc A40, Kühn W41, Lange JS41, Lara M11, Larin P24, Leng C7, Li C40, Li C8, Li DM28, Li F1, Li FY10, Li G1, Li HB1, Li HJ1, Li JC1, Li J42, Li K38, Li K43, Li L44, Li PR19, Li QY38, Li T38, Li WD1, Li WG1, Li XL38, Li XN1, Li XQ27, Li YB18, Li ZB45, Liang H8, Liang YF46, Liang YT41, Liao GR47, Lin DX24, Liu B23, Liu BJ1, Liu CX1, Liu D8, Liu FH48, Liu F1, Liu F49, Liu HB33, Liu HH50, Liu HH1, Liu HM1, Liu J1, Liu JB8, Liu JP15, Liu JY1, Liu K29, Liu KY26, Liu LD10, Liu PL1, Liu Q19, Liu SB8, Liu X21, Liu YB27, Liu ZA1, Liu Z25, Loehner H35, Lou XC1, Lu HJ22, Lu JG1, Lu Y1, Lu YP1, Luo CL34, Luo MX51, Luo T37, Luo XL1, Lyu XR19, Ma FC26, Ma HL1, Ma LL38, Ma MM1, Ma QM1, Ma T1, Ma XN27, Ma XY1, Ma YM38, Maas FE24, Maggiora M6,7, Mao YJ10, Mao ZP1, Marcello S6,7, Messchendorp JG35, Min J1, Mitchell RE11, Mo XH1, Mo YJ49, Morales Morales C24, Muchnoi NY2, Muramatsu H13, Nefedov Y14, Nerling F24, Nikolaev IB2, Ning Z1, Nisar S52, Niu SL1, Niu XY1, Olsen SL42, Ouyang Q1, Pacetti S53, Pan Y8, Patteri P9, Pelizaeus M4, Peng HP8, Peters K32, Pettersson J40, Ping JL34, Ping RG1, Poling R13, Prasad V1, Qi HR18, Qi M20, Qian S1, Qiao CF19, Qin LQ38, Qin N15, Qin XS1, Qin ZH1, Qiu JF1, Rashid KH39, Redmer CF25, Ripka M25, Rong G1, Rosner C24, Ruan XD33, Sarantsev A14, Savrié M30, Schoenning K40, Schumann S25, Shan W10, Shao M8, Shen CP18, Shen PX27, Shen XY1, Sheng HY1, Shi M1, Song WM1, Song XY1, Sosio S6,7, Spataro S6,7, Sun GX1, Sun JF36, Sun SS1, Sun XH1, Sun YJ8, Sun YZ1, Sun ZJ1, Sun ZT11, Tang CJ46, Tang X1, Tapan I54, Thorndike EH5, Tiemens M35, Ullrich M41, Uman I55, Varner GS37, Wang B27, Wang BL19, Wang D10, Wang DY10, Wang K1, Wang LL1, Wang LS1, Wang M38, Wang P1, Wang PL1, Wang SG10, Wang W1, Wang WP8, Wang XF29, Wang Y56, Wang YD24, Wang YF1, Wang YQ25, Wang Z1, Wang ZG1, Wang ZH8, Wang ZY1, Wang ZY1, Weber T25, Wei DH47, Wei JB10, Weidenkaff P25, Wen SP1, Wiedner U4, Wolke M40, Wu LH1, Wu LJ1, Wu Z1, Xia L8, Xia LG29, Xia Y57, Xiao D1, Xiao H58, Xiao ZJ34, Xie YG1, Xiu QL1, Xu GF1, Xu JJ1, Xu L1, Xu QJ43, Xu QN19, Xu XP56, Yan L6,7, Yan WB8, Yan WC8, Yan YH57, Yang HJ23, Yang HX1, Yang L15, Yang YX47, Ye M1, Ye MH59, Yin JH1, Yu BX1, Yu CX27, Yu JS21, Yuan CZ1, Yuan WL20, Yuan Y1, Yuncu A17, Zafar AA39, Zallo A9, Zeng Y57, Zeng Z8, Zhang BX1, Zhang BY1, Zhang C20, Zhang CC1, Zhang DH1, Zhang HH45, Zhang HY1, Zhang J1, Zhang JJ1, Zhang JL1, Zhang JQ1, Zhang JW1, Zhang JY1, Zhang JZ1, Zhang K1, Zhang L1, Zhang SQ27, Zhang XY38, Zhang Y1, Zhang YH1, Zhang YN19, Zhang YT8, Zhang Y19, Zhang ZH49, Zhang ZP8, Zhang ZY15, Zhao G1, Zhao JW1, Zhao JY1, Zhao JZ1, Zhao L8, Zhao L1, Zhao MG27, Zhao Q1, Zhao QW1, Zhao SJ28, Zhao TC1, Zhao YB1, Zhao ZG8, Zhemchugov A14, Zheng B58, Zheng JP1, Zheng WJ38, Zheng YH19, Zhong B34, Zhou L1, Zhou X15, Zhou XK8, Zhou XR8, Zhou XY1, Zhu K1, Zhu KJ1, Zhu S1, Zhu SH60, Zhu XL29, Zhu YC8, Zhu YS1, Zhu ZA1, Zhuang J1, Zotti L6,7, Zou BS1, Zou JH1; BESIII Collaboration.

Author information

1
Institute of High Energy Physics, Beijing 100049, People's Republic of China.
2
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
3
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
4
Bochum Ruhr-University, D-44780 Bochum, Germany.
5
University of Rochester, Rochester, New York 14627, USA.
6
University of Turin, I-10125 Turin, Italy.
7
INFN, I-10125 Turin, Italy.
8
University of Science and Technology of China, Hefei 230026, People's Republic of China.
9
INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
10
Peking University, Beijing 100871, People's Republic of China.
11
Indiana University, Bloomington, Indiana 47405, USA.
12
INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
13
University of Minnesota, Minneapolis, Minnesota 55455, USA.
14
Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
15
Wuhan University, Wuhan 430072, People's Republic of China.
16
Ankara University, 06100 Tandogan, Ankara, Turkey.
17
Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey.
18
Beihang University, Beijing 100191, People's Republic of China.
19
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
20
Nanjing University, Nanjing 210093, People's Republic of China.
21
Lanzhou University, Lanzhou 730000, People's Republic of China.
22
Huangshan College, Huangshan 245000, People's Republic of China.
23
Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
24
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
25
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
26
Liaoning University, Shenyang 110036, People's Republic of China.
27
Nankai University, Tianjin 300071, People's Republic of China.
28
Zhengzhou University, Zhengzhou 450001, People's Republic of China.
29
Tsinghua University, Beijing 100084, People's Republic of China.
30
University of Ferrara, I-44122 Ferrara, Italy.
31
University of Eastern Piedmont, I-15121 Alessandria, Italy.
32
GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
33
GuangXi University, Nanning 530004, People's Republic of China.
34
Nanjing Normal University, Nanjing 210023, People's Republic of China.
35
KVI-CART, University of Groningen, NL-9747 AA Groningen, Netherlands.
36
Henan Normal University, Xinxiang 453007, People's Republic of China.
37
University of Hawaii, Honolulu, Hawaii 96822, USA.
38
Shandong University, Jinan 250100, People's Republic of China.
39
University of the Punjab, Lahore-54590, Pakistan.
40
Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
41
Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
42
Seoul National University, Seoul, 151-747 Korea.
43
Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
44
Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China.
45
Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
46
Sichuan University, Chengdu 610064, People's Republic of China.
47
Guangxi Normal University, Guilin 541004, People's Republic of China.
48
Shanxi University, Taiyuan 030006, People's Republic of China.
49
Central China Normal University, Wuhan 430079, People's Republic of China.
50
Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
51
Zhejiang University, Hangzhou 310027, People's Republic of China.
52
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
53
INFN and University of Perugia, I-06100 Perugia, Italy.
54
Uludag University, 16059 Bursa, Turkey.
55
Near East University, Nicosia, North Cyprus, Mersin 10, Turkey.
56
Soochow University, Suzhou 215006, People's Republic of China.
57
Hunan University, Changsha 410082, People's Republic of China.
58
University of South China, Hengyang 421001, People's Republic of China.
59
China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
60
University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

Abstract

Using 4.479×10^{8}  ψ(3686) events collected with the BESIII detector, we search for the decays ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ, where J=0, 1, 2. The decays ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ are observed for the first time. The measured branching fractions are B(ψ(3686)→e^{+}e^{-}χ_{cJ})=(11.7±2.5±1.0)×10^{-4}, (8.6±0.3±0.6)×10^{-4}, (6.9±0.5±0.6)×10^{-4} for J=0, 1, 2, and B(χ_{cJ}→e^{+}e^{-}J/ψ)=(1.51±0.30±0.13)×10^{-4}, (3.73±0.09±0.25)×10^{-3}, (2.48±0.08±0.16)×10^{-3} for J=0, 1, 2, respectively. The ratios of the branching fractions B(ψ(3686)→e^{+}e^{-}χ_{cJ})/B(ψ(3686)→γχ_{cJ}) and B(χ_{cJ}→e^{+}e^{-}J/ψ)/B(χ_{cJ}→γJ/ψ) are also reported. Also, the α values of helicity angular distributions of the e^{+}e^{-} pair are determined for ψ(3686)→e^{+}e^{-}χ_{c1,2} and χ_{c1,2}→e^{+}e^{-}J/ψ.

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