APS » Phys. Rev. Lett. » Volume 100 » Issue 10

M. Ablikim,¹ J. Z. Bai,¹ Y. Bai,¹ Y. Ban,¹¹ X. Cai,¹ H. F. Chen,¹⁶ H. S. Chen,¹ H. X. Chen,¹ J. C. Chen,¹ Jin Chen,¹ X. D. Chen,⁵ Y. B. Chen,¹ Y. P. Chu,¹ Y. S. Dai,¹⁸ Z. Y. Deng,¹ S. X. Du,¹ J. Fang,¹ C. D. Fu,¹⁴ C. S. Gao,¹ Y. N. Gao,¹⁴ S. D. Gu,¹ Y. T. Gu,⁴ Y. N. Guo,¹ Z. J. Guo,¹⁵ F. A. Harris,¹⁵ K. L. He,¹ M. He,¹² Y. K. Heng,¹ J. Hou,¹⁰ H. M. Hu,¹ T. Hu,¹ G. S. Huang,¹ X. T. Huang,¹² Y. P. Huang,¹ X. B. Ji,¹ X. S. Jiang,¹ J. B. Jiao,¹² D. P. Jin,¹ S. Jin,¹ Y. F. Lai,¹ H. B. Li,¹ J. Li,¹ R. Y. Li,¹ W. D. Li,¹ W. G. Li,¹ X. L. Li,¹ X. N. Li,¹ X. Q. Li,¹⁰ Y. F. Liang,¹³ H. B. Liao,¹ B. J. Liu,¹ C. X. Liu,¹ Fang Liu,¹ Feng Liu,⁶ H. H. Liu,¹ H. M. Liu,¹ J. B. Liu,¹ J. P. Liu,¹⁷ H. B. Liu,⁴ J. Liu,¹ Q. Liu,¹⁵ R. G. Liu,¹ S. Liu,⁸ Z. A. Liu,¹ F. Lu,¹ G. R. Lu,⁵ J. G. Lu,¹ C. L. Luo,⁹ F. C. Ma,⁸ H. L. Ma,² L. L. Ma,¹ Q. M. Ma,¹ M. Q. A. Malik,¹ Z. P. Mao,¹ X. H. Mo,¹ J. Nie,¹ S. L. Olsen,¹⁵ R. G. Ping,¹ N. D. Qi,¹ H. Qin,¹ J. F. Qiu,¹ G. Rong,¹ X. D. Ruan,⁴ L. Y. Shan,¹ L. Shang,¹ C. P. Shen,¹⁵ D. L. Shen,¹ X. Y. Shen,¹ H. Y. Sheng,¹ H. S. Sun,¹ S. S. Sun,¹ Y. Z. Sun,¹ Z. J. Sun,¹ X. Tang,¹ J. P. Tian,¹⁴ G. L. Tong,¹ G. S. Varner,¹⁵ X. Wan,¹ L. Wang,¹ L. L. Wang,¹ L. S. Wang,¹ P. Wang,¹ P. L. Wang,¹ W. F. Wang,¹ Y. F. Wang,¹ Z. Wang,¹ Z. Y. Wang,¹ C. L. Wei,¹ D. H. Wei,³ Y. Weng,¹ N. Wu,¹ X. M. Xia,¹ X. X. Xie,¹ G. F. Xu,¹ X. P. Xu,⁶ Y. Xu,¹⁰ M. L. Yan,¹⁶ H. X. Yang,¹ M. Yang,¹ Y. X. Yang,³ M. H. Ye,² Y. X. Ye,¹⁶ C. X. Yu,¹⁰ G. W. Yu,¹ C. Z. Yuan,¹ Y. Yuan,¹ S. L. Zang,¹ Y. Zeng,⁷ B. X. Zhang,¹ B. Y. Zhang,¹ C. C. Zhang,¹ D. H. Zhang,¹ H. Q. Zhang,¹ H. Y. Zhang,¹ J. W. Zhang,¹ J. Y. Zhang,¹ X. Y. Zhang,¹² Y. Y. Zhang,¹³ Z. X. Zhang,¹¹ Z. P. Zhang,¹⁶ D. X. Zhao,¹ J. W. Zhao,¹ M. G. Zhao,¹ P. P. Zhao,¹ Z. G. Zhao,¹ H. Q. Zheng,¹¹ J. P. Zheng,¹ Z. P. Zheng,¹ B. Zhong L. Zhou,⁹ K. J. Zhu,¹ Q. M. Zhu,¹ X. W. Zhu,¹ Y. C. Zhu,¹ Y. S. Zhu,¹ Z. A. Zhu,¹ Z. L. Zhu,³ B. A. Zhuang,¹ and B. S. Zou¹

(BES Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China
²China Center for Advanced Science and Technology (CCAST), Beijing 100080, People's Republic of China
³Guangxi Normal University, Guilin 541004, People's Republic of China
⁴Guangxi University, Nanning 530004, People's Republic of China
⁵Henan Normal University, Xinxiang 453002, People's Republic of China
⁶Huazhong Normal University, Wuhan 430079, People's Republic of China
⁷Hunan University, Changsha 410082, People's Republic of China
⁸Liaoning University, Shenyang 110036, People's Republic of China
⁹Nanjing Normal University, Nanjing 210097, People's Republic of China
¹⁰Nankai University, Tianjin 300071, People's Republic of China
¹¹Peking University, Beijing 100871, People's Republic of China
¹²Shandong University, Jinan 250100, People's Republic of China
¹³Sichuan University, Chengdu 610064, People's Republic of China
¹⁴Tsinghua University, Beijing 100084, People's Republic of China
¹⁵University of Hawaii, Honolulu, Hawaii 96822, USA
¹⁶University of Science and Technology of China, Hefei 230026, People's Republic of China
¹⁷Wuhan University, Wuhan 430072, People's Republic of China
¹⁸Zhejiang University, Hangzhou 310028, People's Republic of China

The decays of J/f₀(980)[,K⁺K^-,f₀(980)^+-] are analyzed using a sample of 5.8×10⁷ J/ events collected with the BESII detector at the Beijing Electron-Positron Collider. A structure at around 2.18 GeV/c² with about 5 significance is observed in the f₀(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/c² and =0.065±0.023(stat)±0.017(syst) GeV/c², respectively, which are consistent with those of Y(2175), observed by the BABAR Collaboration in the initial-state radiation process e⁺e^-_ISRf₀(980). The production branching ratio is determined to be Br(J/Y(2175))Br(Y(2175)f₀(980))Br(f₀(980)^+-)=[3.23±0.75(stat)±0.73(syst)]×  10^-4, assuming that the Y(2175) is a 1^-- state.

©2008 The American Physical Society

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