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Observation of a charged charmoniumlike structure in e+ e-&rarrπ+π-J/ψat √s=4.26 GeV

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成果类型:
期刊论文
作者:
Ablikim, M.*;Achasov, M.N.;Ai, X.C.;Albayrak, O.;Ambrose, D.J.;An, F.F.;An, Q.;Bai, J.Z.;Baldini Ferroli, R.;Ban, Y.;Becker, J.;Bennett, J.V.;Bertani, M.;Bian, J.M.;Boger, E.;Bondarenko, O.;Boyko, I.;Briere, R.A.;Bytev, V.;Cai, H.;Cai, X.;Cakir, O.;Calcaterra, A.;Cao, G.F.;Cetin, S.A.;Chang, J.F.;Chelkov, G.;Chen, G.;Chen, H.S.;Chen, J.C.;Chen, M.L.;Chen, S.J.;Chen, X.;Chen, Y.B.;Cheng, H.P.;Chu, Y.P.;Cronin-Hennessy, D.;Dai, H.L.;Dai, J.P.;Dedovich, D.;Deng, Z.Y.;Denig, A.;Denysenko, I.;Destefanis, M.;Ding, W.M.;Ding, Y.;Dong, L.Y.;Dong, M.Y.;Du, S.X.;Fang, J.;Fang, S.S.;Fava, L.;Feng, C.Q.;Friedel, P.;Fu, C.D.;Fu, J.L.;Fuks, O.;Gao, Q.;Gao, Y.;Geng, C.;Goetzen, K.;Gong, W.X.;Gradl, W.;Greco, M.;Gu, M.H.;Gu, Y.T.;Guan, Y.H.;Guo, A.Q.;Guo, L.B.;Guo, T.;Guo, Y.P.;Han, Y.L.;Harris, F.A.;He, K.L.;He, M.;He, Z.Y.;Held, T.;Heng, Y.K.;Hou, Z.L.;Hu, C.;Hu, H.M.;Hu, J.F.;Hu, T.;Huang, G.M.;Huang, G.S.;Huang, J.S.;Huang, L.;Huang, X.T.;Huang, Y.;Huang, Y.P.;Hussain, T.;Ji, C.S.;Ji, Q.;Ji, Q.P.;Ji, X.B.;Ji, X.L.;Jiang, L.L.;Jiang, X.S.;Jiao, J.B.;Jiao, Z.;Jin, D.P.;Jin, S.;Jing, F.F.;Kalantar-Nayestanaki, N.;Kavatsyuk, M.;Kopf, B.;Kornicer, M.;Kühn, W.;Lai, W.;Lange, J.S.;Lara, M.;Larin, P.;Leyhe, M.;Li, 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.;Liang, H.;Liang, Y.F.;Liang, Y.T.;Liao, G.R.;Liao, X.T.;Lin, D.;Liu, 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;Loehner, H.;Lou, X.C.;Lu, G.R.;Lu, H.J.;Lu, J.G.;Lu, Q.W.;Lu, X.R.;Lu, Y.P.;Luo, C.L.;Luo, M.X.;Luo, T.;Luo, X.L.;Lv, M.;Ma, C.L.;Ma, F.C.;Ma, H.L.;Ma, Q.M.;Ma, S.;Ma, T.;Ma, X.Y.;Maas, F.E.;Maggiora, M.;Malik, Q.A.;Mao, Y.J.;Mao, Z.P.;Messchendorp, J.G.;Min, J.;Min, T.J.;Mitchell, R.E.;Mo, X.H.
通讯作者:
Ablikim, M.
作者机构:
[Thorndike, E. H.; Ma, T. ; Ambrose, D.J. ] Univ Rochester, Rochester, NY 14627 USA.
[Peters, K.; Goetzen, K. ] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany.
[ Bai, J.Z. ; Li, W.D. ; Dai, H.L. ; Qin, X. S.; Zhu, K.; Liu, C.X. ; Han, Y.L. ; Ablikim, M. ; Chen, J.C. ; Zhao, J. W.; Qiu, J. F.; Ping, R. G.; Chen, G.; Liu, H.H. ; He, K.L. ; Zhang, J. Z.; Li, G.; Qin, Z. H.; Yang, H. X.; Song, W. M.; Tang, X.; Liu, H.W. ; Jin, S. ; Wang, L. S.; Zhang, J. Y.; Liu, F.H. ; Huang, Y. ; Zhang, S. H.; Liao, X.T. ; Liu, Zhiqing; Li, J.C. ; Zhuang, J.; Liu, H.B. ; Ji, X.L. ; Luo, X.L. ; Chu, Y. P.; Wu, Z.; Yuan, Y.; Zhu, S. H.; Zhao, G.; Wang, P. L.; Dai, J.P. ; Gong, W.X. ; Hu, H.M. ; Ma, X.Y. ; Dong, L.Y. ; Lu, Y.P. ; Gu, M.H. ; Jiang, X.S. ; Zhang, B. Y.; Li, X.N. ; Zhu, Y. S.; Zheng, J. P.; Shen, X. Y.; Huang, L. ; Gao, Q. ; Zhao, Y. B.; Fang, J. ; Wu, L. H.; Zhou, L.; Mo, X.H. ; Cao, G.F. ; Li, W.G. ; Lai, W. ; Zhang, X. J.; Zhang, B. X.; Jiang, L.L. ; Wang, Z. G.; Zou, J. H.; Lou, X.C. ; Zhang, Y.; Fu, C.D. ; Sun, S. S.; Ye, H.; An, F.F. ; Wang, Q. J.; Zhang, Y. H.; Wu, N.; Lv, M. ; Ai, X.C. ; Liu, Zhiqiang ; Zhao, T. C.; Wang, Z. Y.; Chang, J.F. ; Fang, S.S. ; Hu, C. ; Dong, M.Y. ; Ma, Q.M. ; Deng, Z.Y. ; Wang, P.; Qian, S.; Zhang, J. Q.; Ji, X.B. ; Chen, H.S. ; Zou, B. S.; Li, S.L. ; Achasov, M.N. ; Song, X. Y.; An, Q. ; Sheng, H. Y.; Xie, Y. G.; Ye, M.; Liu, Q. ; Jin, D.P. ; Wang, L. L.; Ma, H.L. ; Ji, Q. ; Liu, H.M. ; Zhu, K. J.; Wang, Y. F.; Min, T.J. ; Liu, B.J. ; Sun, Y. Z.; Li, Lei ; Rong, G.; Hou, Z.L. ; Zhang, J. W.; Li, Q.J. ; Heng, Y.K. ; Wang, K.; Xu, G. F.; Sun, D. H.; Zhu, Z. A.; Kavatsyuk, M. ; Cai, X. ; He, M. ; Zhao, Ling; Zhang, H. Y.; Min, J. ; Zhao, H. S.; Yuan, C. Z.; Li, Cheng ; Zhang, D. H.; Sun, G. X.; Wen, S. P.; Zhang, C. C.; Ning, Z.; Xue, Z.; Sun, Z. J.; Liu, Fang ; Wang, Z.; Hussain, T. ; Leyhe, M. ; Chen, Y.B. ; Li, G. ; Lu, J.G. ; Zhao, Q.; Mao, Z.P. ; Yu, B. X.] Inst High Energy Phys, Beijing 100049, Peoples R China.
[Zafar, A. A.; Malik, Q.A. ; Hu, T. ; Rashid, K. H.] Univ Punjab, Lahore 54590, Pakistan.
[Xia, L. G.; Zhu, X. L.; Liao, G.R. ; Jing, F.F. ; Liu, K.Y. ; Wang, X. F.; Gao, Y. ] Tsinghua Univ, Beijing 100084, Peoples R China.
通讯机构:
[Ablikim, M] Inst High Energy Phys, Beijing 100049, Peoples R China.
语种:
英文
关键词:
Beijing Electron Positron Collider - Center-of-mass energies - Charmonium - Data sample - Invariant-mass spectra - Mass spectra - Production of
期刊:
Physical Review Letters
ISSN:
0031-9007
年:
2013
卷:
110
期:
25
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:物理学;WOS学科类别:Physics, Multidisciplinary
入藏号:
WOS:000320613800004;EI:20132616452980
基金类别:
Ministry of Science and Technology of China [2009CB825200]; National Natural Science Foundation of China (NSFC) [10625524, 10821063, 10825524, 10835001, 10935007, 11125525, 11235011]; Joint Funds of the National Natural Science Foundation of China [11079008, 11179007]; Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; CAS [KJCX2-YW-N29, KJCX2-YW-N45]; 100 Talents Program of CAS; German Research Foundation DFG under Contract No. Collaborative Research Center [CRC-1044]; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey [DPT2006K-120470]; U.S. Department of Energy [DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823]; U.S. National Science Foundation; University of Groningen (RuG); Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; National Research Foundation of Korea [2011-0029457]; WCU Grant [R32-10155]
机构署名:
本校为其他机构
摘要:
We study the process e<sup>+</sup>e <sup>-</sup>&rarr&pi;<sup>+</sup>&pi;<sup>-</sup>J/&psi;at a center-of-mass energy of 4.260 GeV using a 525 pb<sup>-</sup>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&plusmn;1.9&plusmn;3.7) pb, consistent with the production of the Y(4260). We observe a structure at around 3.9 GeV/c2 in the &pi;<sup>&plusmn;</sup>J/&psi;mass spectrum, which we refer to as the Z<inf>c</inf>(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 &pi;<sup>&plusmn;</sup>J/&psi;invariant mass spectrum, neglecting interference, results in a mass of (3899.0&plusmn;3.6&plusmn;4.9) MeV/c2 and a width of (46&plusmn;10&plusmn;20) MeV. Its production ratio is measured to be R=(&sigma;(e<sup>+</sup>e<sup>-</sup>&rarr&pi;<sup>&plusmn;</sup>Z <inf>c</inf>(3900)<sup>a&circ;&circ;</sup>&rarr&pi;<sup>+</sup>&pi;<sup>-</sup>J/&psi;)/&sigma;(e<sup>+</sup>e <sup>-</sup>&rarr&pi;<sup>+</sup>&pi;<sup>-</sup>J/&psi;))=(21.5&plusmn;3. 3&plusmn;7.5)%. In all measurements the first errors are statistical and the second are systematic. &copy;2013 American Physical Society.
参考文献:
Ablikim M, 2013, PHYS REV D, V87, DOI 10.1103/PhysRevD.87.012002
Ablikim M, 2010, NUCL INSTRUM METH A, V614, P345, DOI 10.1016/j.nima.2009.12.050
Adachi I, 2012, PHYS REV LETT, V108, DOI 10.1103/PhysRevLett.108.032001
Aubert B, 2005, PHYS REV LETT, V95, DOI 10.1103/PhysRevLett.95.142001
Aubert B, 2007, PHYS REV D, V76, DOI 10.1103/PhysRevD.76.111105

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