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Observation of a charged charmoniumlike structure in e+ e- → π+ π- J/ψ at sqrt[s] = 4.26  GeV.

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Physical review letters Pub Date : 2013-06-21 Epub Date: 2013-06-17 DOI:10.1103/PhysRevLett.110.252001
M Ablikim, M N Achasov, X C Ai, O Albayrak, D J Ambrose, F F An, Q An, J Z Bai, R Baldini Ferroli, Y Ban, J Becker, J V Bennett, M Bertani, J M Bian, E Boger, O Bondarenko, I Boyko, R A Briere, V Bytev, H Cai, X Cai, O Cakir, A Calcaterra, G F Cao, S A Cetin, J F Chang, G Chelkov, G Chen, H S Chen, J C Chen, M L Chen, S J Chen, X Chen, Y B Chen, H P Cheng, Y P Chu, D Cronin-Hennessy, H L Dai, J P Dai, D Dedovich, Z Y Deng, A Denig, I Denysenko, M Destefanis, W M Ding, Y Ding, L Y Dong, M Y Dong, S X Du, J Fang, S S Fang, L Fava, C Q Feng, P Friedel, C D Fu, J L Fu, O Fuks, Q Gao, Y Gao, C Geng, K Goetzen, W X Gong, W Gradl, M Greco, M H Gu, Y T Gu, Y H Guan, A Q Guo, L B Guo, T Guo, Y P Guo, Y L Han, F A Harris, K L He, M He, Z Y He, T Held, Y K Heng, Z L Hou, C Hu, H M Hu, J F Hu, T Hu, G M Huang, G S Huang, J S Huang, L Huang, X T Huang, Y Huang, Y P Huang, T Hussain, C S Ji, Q Ji, Q P Ji, X B Ji, X L Ji, L L Jiang, X S Jiang, J B Jiao, Z Jiao, D P Jin, S Jin, F F Jing, N Kalantar-Nayestanaki, M Kavatsyuk, B Kopf, M Kornicer, W Kühn, W Lai, J S Lange, M Lara, P Larin, M Leyhe, C H Li, Cheng Li, Cui Li, D M Li, F Li, G Li, H B Li, J C Li, K Li, Lei Li, Q J Li, S L Li, W D Li, W G Li, X L Li, X N Li, X Q Li, X R Li, Z B Li, H Liang, Y F Liang, Y T Liang, G R Liao, X T Liao, D Lin, B J Liu, C L Liu, C X Liu, F H Liu, Fang Liu, Feng Liu, H Liu, H B Liu, H H Liu, H M Liu, H W Liu, J P Liu, K Liu, K Y Liu, Kai Liu, P L Liu, Q Liu, S B Liu, X Liu, Y B Liu, Z A Liu, Zhiqiang Liu, Zhiqing Liu, H Loehner, X C Lou, G R Lu, H J Lu, J G Lu, Q W Lu, X R Lu, Y P Lu, C L Luo, M X Luo, T Luo, X L Luo, M Lv, C L Ma, F C Ma, H L Ma, Q M Ma, S Ma, T Ma, X Y Ma, F E Maas, M Maggiora, Q A Malik, Y J Mao, Z P Mao, J G Messchendorp, J Min, T J Min, R E Mitchell, X H Mo, Y J Mo, H Moeini, C Morales Morales, K Moriya, N Yu Muchnoi, H Muramatsu, Y Nefedov, C Nicholson, I B Nikolaev, Z Ning, S L Olsen, Q Ouyang, S Pacetti, J W Park, M Pelizaeus, H P Peng, K Peters, J L Ping, R G Ping, R Poling, E Prencipe, M Qi, S Qian, C F Qiao, L Q Qin, X S Qin, Y Qin, Z H Qin, J F Qiu, K H Rashid, G Rong, X D Ruan, A Sarantsev, B D Schaefer, M Shao, C P Shen, X Y Shen, H Y Sheng, M R Shepherd, W M Song, X Y Song, S Spataro, B Spruck, D H Sun, G X Sun, J F Sun, S S Sun, Y J Sun, Y Z Sun, Z J Sun, Z T Sun, C J Tang, X Tang, I Tapan, E H Thorndike, D Toth, M Ullrich, I Uman, G S Varner, B Q Wang, D Wang, D Y Wang, K Wang, L L Wang, L S Wang, M Wang, P Wang, P L Wang, Q J Wang, S G Wang, X F Wang, X L Wang, Y D Wang, Y F Wang, Y Q Wang, Z Wang, Z G Wang, Z Y Wang, D H Wei, J B Wei, P Weidenkaff, Q G Wen, S P Wen, M Werner, U Wiedner, L H Wu, N Wu, S X Wu, W Wu, Z Wu, L G Xia, Y X Xia, Z J Xiao, Y G Xie, Q L Xiu, G F Xu, G M Xu, Q J Xu, Q N Xu, X P Xu, Z R Xu, F Xue, Z Xue, L Yan, W B Yan, Y H Yan, H X Yang, Y Yang, Y X Yang, H Ye, M Ye, M H Ye, B X Yu, C X Yu, H W Yu, J S Yu, S P Yu, C Z Yuan, Y Yuan, A A Zafar, A Zallo, S L Zang, Y Zeng, B X Zhang, B Y Zhang, C Zhang, C C Zhang, D H Zhang, H H Zhang, H Y Zhang, J Q Zhang, J W Zhang, J Y Zhang, J Z Zhang, LiLi Zhang, R Zhang, S H Zhang, X J Zhang, X Y Zhang, Y Zhang, Y H Zhang, Z P Zhang, Z Y Zhang, Zhenghao Zhang, G Zhao, H S Zhao, J W Zhao, K X Zhao, Lei Zhao, Ling Zhao, M G Zhao, Q Zhao, S J Zhao, T C Zhao, X H Zhao, Y B Zhao, Z G Zhao, A Zhemchugov, B Zheng, J P Zheng, Y H Zheng, B Zhong, L Zhou, X Zhou, X K Zhou, X R Zhou, C Zhu, K Zhu, K J Zhu, S H Zhu, X L Zhu, Y C Zhu, Y M Zhu, Y S Zhu, Z A Zhu, J Zhuang, B S Zou, J H Zou
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The Born cross section is measured to be (62.9±1.9±3.7)  pb, consistent with the production of the Y(4260). We observe a structure at around 3.9  GeV/c2 in the π(±)J/ψ mass spectrum, which we refer to as the Z(c)(3900). If interpreted as a new particle, it is unusual in that it carries an electric charge and couples to charmonium. A fit to the π(±)J/ψ invariant mass spectrum, neglecting interference, results in a mass of (3899.0±3.6±4.9)  MeV/c2 and a width of (46±10±20)  MeV. Its production ratio is measured to be R = (σ(e+ e- → π(±)Z(c)(3900)(∓) → π+ π- J/ψ)/σ(e+ e- → π+ π- J/ψ)) = (21.5±3.3±7.5)%. 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引用次数: 334

Abstract

We study the process ee+ e- → π+ π- J/ψ at a center-of-mass energy of 4.260 GeV using a 525  pb(-1) data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross section is measured to be (62.9±1.9±3.7)  pb, consistent with the production of the Y(4260). We observe a structure at around 3.9  GeV/c2 in the π(±)J/ψ mass spectrum, which we refer to as the Z(c)(3900). If interpreted as a new particle, it is unusual in that it carries an electric charge and couples to charmonium. A fit to the π(±)J/ψ invariant mass spectrum, neglecting interference, results in a mass of (3899.0±3.6±4.9)  MeV/c2 and a width of (46±10±20)  MeV. Its production ratio is measured to be R = (σ(e+ e- → π(±)Z(c)(3900)(∓) → π+ π- J/ψ)/σ(e+ e- → π+ π- J/ψ)) = (21.5±3.3±7.5)%. In all measurements the first errors are statistical and the second are systematic.

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在sqrt[s] = 4.26 GeV时，e+ e-→π+ π- J/ψ中带电类谐元结构的观察。
利用北京正电子对撞机BESIII探测器采集的525 pb(-1)数据样本，研究了质心能量为4.260 GeV时的ee+ e-→π+ π- J/ψ过程。Born截面测量值为(62.9±1.9±3.7)pb，与Y(4260)的产量一致。我们在π(±)J/ψ的质谱中观察到3.9 GeV/c2左右的结构，我们称之为Z(c)(3900)。如果把它解释为一种新粒子，它的不同寻常之处在于它携带一个电荷，并与调和体偶联。对π(±)J/ψ不变质谱进行拟合，忽略干扰，得到质量为(3899.0±3.6±4.9)MeV/c2，宽度为(46±10±20)MeV。其生产比率测量R =(σ(e + e -→π(±)Z (c)(3900)(∓)→π+π- J /ψ)/σ(e + e -→π+π- J /ψ))=(21.5±3.3±7.5)%。在所有的测量中，第一个误差是统计误差，第二个误差是系统误差。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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来源期刊
Physical review letters
Physical review letters 物理-物理：综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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