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Phys Rev Lett. 2014 Mar 7;112(9):092001. Epub 2014 Mar 3.

Observation of e+e- → γX(3872) at BESIII.

Ablikim M1, Achasov MN2, Ai XC1, Albayrak O3, Ambrose DJ4, An FF1, An Q5, Bai JZ1, Baldini Ferroli R6, Ban Y7, Bennett JV8, Bertani M6, Bian JM9, Boger E10, Bondarenko O11, Boyko I10, Braun S12, Briere RA3, Cai H13, Cai X1, Cakir O14, Calcaterra A6, Cao GF1, Cetin SA15, Chang JF1, Chelkov G10, Chen G1, Chen HS1, Chen JC1, Chen ML1, Chen SJ16, Chen X1, Chen XR17, Chen YB1, Cheng HP18, Chu XK7, Chu YP1, Cronin-Hennessy D9, Dai HL1, Dai JP1, Dedovich D10, Deng ZY1, Denig A19, Denysenko I10, Destefanis M20, Ding WM21, Ding Y22, Dong C23, Dong J1, Dong LY1, Dong MY1, Du SX24, Fan JZ25, Fang J1, Fang SS1, Fang Y1, Fava L26, Feng CQ5, Fu CD1, Fu JL16, Fuks O10, Gao Q1, Gao Y25, Geng C5, Goetzen K27, Gong WX1, Gradl W19, Greco M20, Gu MH1, Gu YT28, Guan YH1, Guo AQ23, Guo LB29, Guo T29, Guo YP19, Han YL1, Harris FA30, He KL1, He M1, He ZY23, Held T31, Heng YK1, Hou ZL1, Hu C29, Hu HM1, Hu JF12, Hu T1, Huang GM32, Huang GS5, Huang JS33, Huang L1, Huang XT21, Huang Y16, Hussain T34, Ji CS5, Ji Q1, Ji QP23, Ji XB1, Ji XL1, Jiang LL1, Jiang XS1, Jiao JB21, Jiao Z18, Jin DP1, Jin S1, Johansson T35, Kalantar-Nayestanaki N11, Kang XL1, Kang XS23, Kavatsyuk M11, Kloss B19, Kopf B31, Kornicer M30, Kuehn W12, Kupsc A35, Lai W1, Lange JS12, Lara M8, Larin P36, Leyhe M31, Li CH1, Li C5, Li C5, Li D37, Li DM24, Li F1, Li G1, Li HB1, Li JC1, Li K21, Li K38, Li L1, Li PR39, Li QJ1, Li T21, Li WD1, Li WG1, Li XL21, Li XN1, Li XQ23, Li XR40, Li ZB41, Liang H5, Liang YF42, Liang YT12, Lin DX36, Liu BJ1, Liu CL3, Liu CX1, Liu FH43, Liu F1, Liu F32, Liu HB28, Liu HH44, Liu HM1, Liu J1, Liu JP13, Liu K25, Liu KY22, Liu PL21, Liu Q39, Liu SB5, Liu X17, Liu YB23, Liu ZA1, Liu Z1, Liu Z19, Loehner H11, Lou XC1, Lu GR33, Lu HJ18, Lu HL1, Lu JG1, Lu XR39, Lu Y1, Lu YP1, Luo CL29, Luo MX45, Luo T30, Luo XL1, Lv M1, Ma FC22, Ma HL1, Ma QM1, Ma S1, Ma T1, Ma XY1, Maas FE36, Maggiora M20, Malik QA34, Mao YJ7, Mao ZP1, Messchendorp JG11, Min J1, Min TJ1, Mitchell RE8, Mo XH1, Mo YJ32, Moeini H11, Morales Morales C36, Moriya K8, Muchnoi NY2, Muramatsu H9, Nefedov Y10, Nikolaev IB2, Ning Z1, Nisar S46, Niu XY1, Olsen SL40, Ouyang Q1, Pacetti S47, Pelizaeus M31, Peng HP5, Peters K27, Ping JL29, Ping RG1, Poling R9, Prencipe E19, Qi M16, Qian S1, Qiao CF39, Qin LQ21, Qin XS1, Qin Y7, Qin ZH1, Qiu JF1, Rashid KH34, Redmer CF19, Ripka M19, Rong G1, Ruan XD28, Sarantsev A10, Schoenning K35, Schumann S19, Shan W7, Shao M5, Shen CP48, Shen XY1, Sheng HY1, Shepherd MR8, Song WM1, Song XY1, Spataro S20, Spruck B12, Sun GX1, Sun JF33, Sun SS1, Sun YJ5, Sun YZ1, Sun ZJ1, Sun ZT5, Tang CJ42, Tang X1, Tapan I49, Thorndike EH4, Toth D9, Ullrich M12, Uman I15, Varner GS30, Wang B23, Wang D7, Wang DY7, Wang K1, Wang LL1, Wang LS1, Wang M21, Wang P1, Wang PL1, Wang QJ1, Wang SG7, Wang W1, Wang XF25, Wang YD6, Wang YF1, Wang YQ19, Wang Z1, Wang ZG1, Wang ZH5, Wang ZY1, Wei DH50, Wei JB7, Weidenkaff P19, Wen SP1, Werner M12, Wiedner U31, Wolke M35, Wu LH1, Wu N1, Wu Z1, Xia LG25, Xia Y37, Xiao D1, Xiao ZJ29, Xie YG1, Xiu QL1, Xu GF1, Xu L1, Xu QJ38, Xu QN39, Xu XP51, Xue Z1, Yan L5, Yan WB5, Yan WC5, Yan YH37, Yang HX1, Yang Y32, Yang YX50, Ye H1, Ye M1, Ye MH52, Yu BX1, Yu CX23, Yu HW7, Yu JS17, Yu SP21, Yuan CZ1, Yuan WL16, Yuan Y1, Zafar AA34, Zallo A6, Zang SL16, Zeng Y37, Zhang BX1, Zhang BY1, Zhang C16, Zhang CB37, Zhang CC1, Zhang DH1, Zhang HH41, Zhang HY1, Zhang JJ1, Zhang JQ1, Zhang JW1, Zhang JY1, Zhang JZ1, Zhang SH1, Zhang XJ1, Zhang XY21, Zhang Y1, Zhang YH1, Zhang ZH32, Zhang ZP5, Zhang ZY13, Zhao G1, Zhao JW1, Zhao L5, Zhao L1, Zhao MG23, Zhao Q1, Zhao QW1, Zhao SJ24, Zhao TC1, Zhao XH16, Zhao YB1, Zhao ZG5, Zhemchugov A10, Zheng B53, Zheng JP1, Zheng YH39, Zhong B29, Zhou L1, Zhou L23, Zhou X13, Zhou XK39, Zhou XR5, Zhou XY1, Zhu K1, Zhu KJ1, Zhu XL25, Zhu YC5, Zhu YS1, Zhu ZA1, Zhuang J1, 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
University of Rochester, Rochester, New York 14627, USA.
5
University of Science and Technology of China, Hefei 230026, People's Republic of China.
6
INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
7
Peking University, Beijing 100871, People's Republic of China.
8
Indiana University, Bloomington, Indiana 47405, USA.
9
University of Minnesota, Minneapolis, Minnesota 55455, USA.
10
Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
11
KVI, University of Groningen, NL-9747 AA Groningen, The Netherlands.
12
Universitaet Giessen, D-35392 Giessen, Germany.
13
Wuhan University, Wuhan 430072, People's Republic of China.
14
Ankara University, Dogol Caddesi, 06100 Tandogan, Ankara, Turkey;
15
Dogus University, 34722 Istanbul, Turkey.
16
Nanjing University, Nanjing 210093, People's Republic of China.
17
Lanzhou University, Lanzhou 730000, People's Republic of China.
18
Huangshan College, Huangshan 245000, People's Republic of China.
19
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
20
University of Turin, I-10125 Turin, Italy and INFN, I-10125 Turin, Italy.
21
Shandong University, Jinan 250100, People's Republic of China.
22
Liaoning University, Shenyang 110036, People's Republic of China.
23
Nankai university, Tianjin 300071, People's Republic of China.
24
Zhengzhou University, Zhengzhou 450001, People's Republic of China.
25
Tsinghua University, Beijing 100084, People's Republic of China.
26
University of Eastern Piedmont, I-15121 Alessandria, Italy and INFN, I-10125 Turin, Italy.
27
GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
28
GuangXi University, Nanning 530004, People's Republic of China.
29
Nanjing Normal University, Nanjing 210023, People's Republic of China.
30
University of Hawaii, Honolulu, Hawaii 96822, USA.
31
Bochum Ruhr-University, D-44780 Bochum, Germany.
32
Central China Normal University, Wuhan 430079, People's Republic of China.
33
Henan Normal University, Xinxiang 453007, People's Republic of China.
34
University of the Punjab, Lahore 54590, Pakistan.
35
Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
36
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
37
Hunan University, Changsha 410082, People's Republic of China.
38
Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
39
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
40
Seoul National University, Seoul 151-747, Korea.
41
Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
42
Sichuan University, Chengdu 610064, People's Republic of China.
43
Shanxi University, Taiyuan 030006, People's Republic of China.
44
Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
45
Zhejiang University, Hangzhou 310027, People's Republic of China.
46
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
47
INFN and University of Perugia, I-06100 Perugia, Italy.
48
Beihang University, Beijing 100191, People's Republic of China.
49
Uludag University, 16059 Bursa, Turkey.
50
Guangxi Normal University, Guilin 541004, People's Republic of China.
51
Soochow University, Suzhou 215006, People's Republic of China.
52
China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
53
University of South China, Hengyang 421001, People's Republic of China.

Abstract

With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e+e-→ γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9 ± 0.7s tat ± 0.2 syst)  MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section σ[e+e- → γX(3872)] and the branching fraction B[X(3872)→π+π-J/ψ] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) → γX(3872).

PMID:
24655246
DOI:
10.1103/PhysRevLett.112.092001
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