Observation of a Broad 1^-- Resonant Structure around 1.5 GeV/c² in the K⁺K^- Mass Spectrum in J/K⁺K^-⁰

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

Received 21 June 2006; published 6 October 2006

Abroad peak is observed at low K⁺K^- invariant mass inJ/ psi --> K⁺K^-⁰ decays found in a sample of 5.8×10⁷ J/ psi eventscollected with the BESII detector. The statistical significance of thebroad resonance is much larger than 5 sigma . A partial waveanalysis shows that the J^PC of this structure is 1^--.Its pole position is determined to be [1576 -55+49 (stat) -91+98 (syst)] MeV/c²- (i/2) [818 -23+22 (stat) -133+64 (syst)] MeV/c². These parametersare not compatible with any known meson resonances.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.142002
DOI:	10.1103/PhysRevLett.97.142002
PACS:	13.25.Gv; 13.75.Lb; 14.40.-n 13.25.Gv Hadronic decays of J/, , and other quarkonia 13.75.Lb Meson–meson interactions (energy10 GeV) 14.40.-n Mesons YEAR: 2006