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Phys Rev Lett. 2017 Mar 3;118(9):092002. doi: 10.1103/PhysRevLett.118.092002. Epub 2017 Mar 1.

Evidence of Two Resonant Structures in e^{+}e^{-}→π^{+}π^{-}h_{c}.

Ablikim M1, Achasov MN2, Ahmed S3, Ai XC1, Albayrak O4, Albrecht M5, Ambrose DJ6, Amoroso A7,8, An FF1, An Q9, Bai JZ1, Bakina O10, Baldini Ferroli R11, Ban Y12, Bennett DW13, Bennett JV4, Berger N14, Bertani M11, Bettoni D15, Bian JM16, Bianchi F7,8, Boger E10, Boyko I10, Briere RA4, Cai H17, Cai X1, Cakir O18, Calcaterra A11, Cao GF1, Cetin SA19, Chai J8, Chang JF1, Chelkov G10, Chen G1, Chen HS1, Chen JC1, Chen ML1, Chen S20, Chen SJ21, Chen X1, Chen XR22, Chen YB1, Chu XK12, Cibinetto G15, Dai HL1, Dai JP23, Dbeyssi A3, Dedovich D10, Deng ZY1, Denig A14, Denysenko I10, Destefanis M7,8, De Mori F7,8, Ding Y24, Dong C25, Dong J1, Dong LY1, Dong MY1, Dou ZL21, Du SX26, Duan PF1, Fan JZ27, Fang J1, Fang SS1, Fang X9, Fang Y1, Farinelli R15,28, Fava L29,8, Feldbauer F14, Felici G11, Feng CQ9, Fioravanti E15, Fritsch M3,14, Fu CD1, Gao Q1, Gao XL9, Gao Y27, Gao Z9, Garzia I15, Goetzen K30, Gong L25, Gong WX1, Gradl W14, Greco M7,8, Gu MH1, Gu YT31, Guan YH1, Guo AQ1, Guo LB32, Guo RP1, Guo Y1, Guo YP14, Haddadi Z33, Hafner A14, Han S17, Hao XQ34, Harris FA35, He KL1, Heinsius FH5, Held T5, Heng YK1, Holtmann T5, Hou ZL1, Hu C32, Hu HM1, Hu JF7,8, Hu T1, Hu Y1, Huang GS9, Huang JS34, Huang XT36, Huang XZ21, Huang ZL24, Hussain T37, Ikegami Andersson W38, Ji Q1, Ji QP34, Ji XB1, Ji XL1, Jiang LW17, Jiang XS1, Jiang XY25, Jiao JB36, Jiao Z39, Jin DP1, Jin S1, Johansson T38, Julin A16, Kalantar-Nayestanaki N33, Kang XL1, Kang XS25, Kavatsyuk M33, Ke BC4, Kiese P14, Kliemt R30, Kloss B14, Kolcu OB19, Kopf B5, Kornicer M35, Kupsc A38, Kühn W40, Lange JS40, Lara M13, Larin P3, Lavezzi L1,8, Leithoff H14, Leng C8, Li C38, Li C9, Li DM26, Li F1, Li FY12, Li G1, Li HB1, Li HJ1, Li JC1, Li J41, Li K42, Li K36, Li L43, Li PR44,20, Li QY36, Li T36, Li WD1, Li WG1, Li XL36, Li XN1, Li XQ25, Li YB45, Li ZB46, Liang H9, Liang YF47, Liang YT40, Liao GR48, Lin DX3, Liu B23, Liu BJ1, Liu CX1, Liu D9, Liu FH49, Liu F1, Liu F50, Liu HB31, Liu HH1, Liu HH51, Liu HM1, Liu J1, Liu JB9, Liu JP17, Liu JY1, Liu K27, Liu KY24, Liu LD12, Liu PL1, Liu Q20, Liu SB9, Liu X22, Liu YB25, Liu YY25, Liu ZA1, Liu Z14, Loehner H33, Lou XC1, Lu HJ39, Lu JG1, Lu Y1, Lu YP1, Luo CL32, Luo MX52, Luo T35, Luo XL1, Lyu XR20, Ma FC24, Ma HL1, Ma LL36, Ma MM1, Ma QM1, Ma T1, Ma XN25, Ma XY1, Ma YM36, Maas FE3, Maggiora M7,8, Malik QA37, Mao YJ12, Mao ZP1, Marcello S7,8, Messchendorp JG33, Mezzadri G28, Min J1, Min TJ1, Mitchell RE13, Mo XH1, Mo YJ50, Morales Morales C3, Muchnoi NY2, Muramatsu H16, Musiol P5, Nefedov Y10, Nerling F30, Nikolaev IB2, Ning Z1, Nisar S53, Niu SL1, Niu XY1, Olsen SL41, Ouyang Q1, Pacetti S54, Pan Y9, Patteri P11, Pelizaeus M5, Peng HP9, Peters K30, Pettersson J38, Ping JL32, Ping RG1, Poling R16, Prasad V1, Qi HR45, Qi M21, Qian S1, Qiao CF20, Qin LQ36, Qin N17, Qin XS1, Qin ZH1, Qiu JF1, Rashid KH37, Redmer CF14, Ripka M14, Rong G1, Rosner C3, Ruan XD31, Sarantsev A10, Savrié M28, Schnier C5, Schoenning K38, Shan W12, Shao M9, Shen CP45, Shen PX25, Shen XY1, Sheng HY1, Song WM1, Song XY1, Sosio S7,8, Spataro S7,8, Sun GX1, Sun JF34, Sun SS1, Sun XH1, Sun YJ9, Sun YZ1, Sun ZJ1, Sun ZT13, Tang CJ47, Tang X1, Tapan I55, Thorndike EH6, Tiemens M33, Uman I56, Varner GS35, Wang B25, Wang BL20, Wang D12, Wang DY12, Wang K1, Wang LL1, Wang LS1, Wang M36, Wang P1, Wang PL1, Wang W1, Wang WP9, Wang XF27, Wang Y57, Wang YD3, Wang YF1, Wang YQ14, Wang Z1, Wang ZG1, Wang ZH9, Wang ZY1, Wang ZY1, Weber T14, Wei DH48, Weidenkaff P14, Wen SP1, Wiedner U5, Wolke M38, Wu LH1, Wu LJ1, Wu Z1, Xia L9, Xia LG27, Xia Y58, Xiao D1, Xiao H59, Xiao ZJ32, Xie YG1, Xie Y50, Xiu QL1, Xu GF1, Xu JJ1, Xu L1, Xu QJ42, Xu QN20, Xu XP57, Yan L7,8, Yan WB9, Yan WC9, Yan YH58, Yang HJ23, Yang HX1, Yang L17, Yang YX48, Ye M1, Ye MH44, Yin JH1, You ZY46, Yu BX1, Yu CX25, Yu JS22, Yuan CZ1, Yuan Y1, Yuncu A19, Zafar AA37, Zeng Y58, Zeng Z9, Zhang BX1, Zhang BY1, Zhang CC1, Zhang DH1, Zhang HH46, Zhang HY1, Zhang J1, Zhang JJ1, Zhang JL1, Zhang JQ1, Zhang JW1, Zhang JY1, Zhang JZ1, Zhang K1, Zhang L1, Zhang SQ25, Zhang XY36, Zhang Y1, Zhang Y1, Zhang YH1, Zhang YN20, Zhang YT9, Zhang Y20, Zhang ZH50, Zhang ZP9, Zhang ZY17, Zhao G1, Zhao JW1, Zhao JY1, Zhao JZ1, Zhao L9, Zhao L1, Zhao MG25, Zhao Q1, Zhao QW1, Zhao SJ26, Zhao TC1, Zhao YB1, Zhao ZG9, Zhemchugov A10, Zheng B59, Zheng JP1, Zheng WJ36, Zheng YH20, Zhong B32, Zhou L1, Zhou X17, Zhou XK9, Zhou XR9, Zhou XY1, Zhu K1, Zhu KJ1, Zhu S1, Zhu SH60, Zhu XL27, Zhu YC9, Zhu YS1, Zhu ZA1, Zhuang J1, Zotti L7,8, 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
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
4
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
5
Bochum Ruhr-University, D-44780 Bochum, Germany.
6
University of Rochester, Rochester, New York 14627, USA.
7
University of Turin, I-10125 Turin, Italy.
8
INFN, I-10125 Turin, Italy.
9
University of Science and Technology of China, Hefei 230026, People's Republic of China.
10
Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
11
INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
12
Peking University, Beijing 100871, People's Republic of China.
13
Indiana University, Bloomington, Indiana 47405, USA.
14
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
15
INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
16
University of Minnesota, Minneapolis, Minnesota 55455, USA.
17
Wuhan University, Wuhan 430072, People's Republic of China.
18
Ankara University, 06100 Tandogan, Ankara, Turkey.
19
Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey.
20
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
21
Nanjing University, Nanjing 210093, People's Republic of China.
22
Lanzhou University, Lanzhou 730000, People's Republic of China.
23
Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
24
Liaoning University, Shenyang 110036, People's Republic of China.
25
Nankai University, Tianjin 300071, People's Republic of China.
26
Zhengzhou University, Zhengzhou 450001, People's Republic of China.
27
Tsinghua University, Beijing 100084, People's Republic of China.
28
University of Ferrara, I-44122 Ferrara, Italy.
29
University of Eastern Piedmont, I-15121 Alessandria, Italy.
30
GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
31
Guangxi University, Nanning 530004, People's Republic of China.
32
Nanjing Normal University, Nanjing 210023, People's Republic of China.
33
KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands.
34
Henan Normal University, Xinxiang 453007, People's Republic of China.
35
University of Hawaii, Honolulu, Hawaii 96822, USA.
36
Shandong University, Jinan 250100, People's Republic of China.
37
University of the Punjab, Lahore-54590, Pakistan.
38
Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
39
Huangshan College, Huangshan 245000, People's Republic of China.
40
Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
41
Seoul National University, Seoul 151-747, Korea.
42
Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
43
Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China.
44
China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
45
Beihang University, Beijing 100191, People's Republic of China.
46
Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
47
Sichuan University, Chengdu 610064, People's Republic of China.
48
Guangxi Normal University, Guilin 541004, People's Republic of China.
49
Shanxi University, Taiyuan 030006, People's Republic of China.
50
Central China Normal University, Wuhan 430079, People's Republic of China.
51
Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
52
Zhejiang University, Hangzhou 310027, People's Republic of China.
53
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
54
INFN and University of Perugia, I-06100 Perugia, Italy.
55
Uludag University, 16059 Bursa, Turkey.
56
Near East University, Nicosia, North Cyprus, Mersin 10, Turkey.
57
Soochow University, Suzhou 215006, People's Republic of China.
58
Hunan University, Changsha 410082, People's Republic of China.
59
University of South China, Hengyang 421001, People's Republic of China.
60
University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

Abstract

The cross sections of e^{+}e^{-}→π^{+}π^{-}h_{c} at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e^{+}e^{-}→π^{+}π^{-}J/ψ and e^{+}e^{-}→π^{+}π^{-}ψ(2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e^{+}e^{-}→π^{+}π^{-}h_{c} cross sections around 4.22 and 4.39  GeV/c^{2}, which we call Y(4220) and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4_{-4.5}^{+5.5}±0.9)  MeV/c^{2} and a width of (66.0_{-8.3}^{+12.3}±0.4)  MeV for the Y(4220), and a mass of (4391.5_{-6.8}^{+6.3}±1.0)  MeV/c^{2} and a width of (139.5_{-20.6}^{+16.2}±0.6)  MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10σ over one structure assumption.

PMID:
28306302
DOI:
10.1103/PhysRevLett.118.092002
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