Observation Of Y(2175) In J/Psi ->Eta Phi F(0)(980)
M. Ablikim,J. Z. Bai,Y. Bai,Y. Ban,X. Cai,H. F. Chen,H. S. Chen,H. X. Chen,J. C. Chen,Jin Chen,X. D. Chen,Y. B. Chen,Y. P. Chu,Y. S. Dai,Z. Y. Deng,S. X. Du,J. Fang,C. D. Fu,C. S. Gao,Y. N. Gao,S. D. Gu,Y. T. Gu,Y. N. Guo,Z. J. Guo,F. A. Harris,K. I. He,M. He,Y. K. Heng,J. Hou,H. H. Hu,T. Hu,G. S. Huang,X. T. Huang,Y. P. Huang,X. B. Ji,X. S. Jiang,J. B. Jiao,D. P. Jin,S. Jin,Y. F. Lai,H. B. Li,J. Li,R. Y. Li,W. D. Li,W. G. Li,X. I. Li,X. N. Li,X. Q. Li,Y. F. Liang,H. B. Liao,B. J. Liu,C. X. Liu,Fang Liu,Feng Liu,H. H. Liu,H. M. Liu,J. P. Liu,J. Liu,Q. Liu,R. G. Liu,S. Liu,Z. A. Liu,F. Lu,G. R. Lu,J. G. Lu,C. L. Luo,F. C. Ma,H. L. Ma,L. L. Ma,Q. M. Ma,M. Q. A. Malik,Z. P. Mao,X. H. Mo,J. Nie,S. I. Olsen,R. G. Ping,N. D. Qi,H. Qin,J. F. Qiu,G. Rong,X. D. Ruan,L. Y. Shan,I. Shang,C. P. Shen,D. L. Shen,X. Y. Shen,H. Y. Sheng,H. S. Sun,S. S. Sun,Y. Z. Sun,Z. J. Sun,X. Tang,J. P. Tian,G. L. Tong,G. S. Varner,X. Wan,L. Wang,L. L. Wang,L. S. Wang,P. Wamg,P. L. Wang,W. F. Wang,Y. F. Wang,Z. Wang,Z. Y. Wnag,C. I. Wei,D. H. Wei,Y. Weng,N. Wu,X. M. Xia,X. X. Xie,G. F. Xu,X. P. Xu,Y. Xu,M. L. Yan,H. X. Yang,M. Yang,Y. X. Yang,M. H. Ye,Y. X. Ye,C. Y. Yu,G. W. Yu,C. Z. Yuan,Y. Yuan,S. L. Zang,Y. Zeng,B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,H. Q. Zhang,H. Y. Zhnagg,J. W. Zhang,J. Y. Zhang,X. Y. Zhang,Y. Y. Zhang,Z. X. Zhang,Z. P. Zhang,D. X. Zhao,J. W. Zhao,M. G. Zhao,P. P. Zhao,Z. G. Zhao,H. Q. Zheng,J. P. Zheng,Z. P. Zheng,B. Zhong,L. Zhou,K. J. Zhu,Q. M. Zhu,X. W. Zhu,Y. C. Zhu,Y. S. Zhu,Z. A. Zhu,Z. L. Zhu,B. A. Zhuang,B. S. Zou
PHYSICAL REVIEW LETTERS（2008）
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摘要
The decays of J/psi ->eta phi f(0)(980)[eta ->gamma gamma, phi -> K+K-, f(0)(980)->pi(+)pi(-)] are analyzed using a sample of 5.8x10(7) J/psi events collected with the BESII detector at the Beijing Electron-Positron Collider. A structure at around 2.18 GeV/c(2) with about 5 sigma significance is observed in the phi f(0)(980) invariant mass spectrum. A fit with a Breit-Wigner function gives the peak mass and width of m=2.186 +/- 0.010(stat)+/- 0.006(syst) GeV/c(2) and Gamma=0.065 +/- 0.023(stat)+/- 0.017(syst) GeV/c(2), respectively, which are consistent with those of Y(2175), observed by the BABAR Collaboration in the initial-state radiation process e(+)e(-)->gamma(ISR)phi f(0)(980). The production branching ratio is determined to be Br(J/psi ->eta Y(2175))Br(Y(2175)->phi f(0)(980))Br(f(0)(980)->pi(+)pi(-))=[3.23 +/- 0.75(stat)+/- 0.73(syst)]x 10(-4), assuming that the Y(2175) is a 1(--) state.
