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Measurements of the mass and full-width of the ηc meson

  • J. Z. Bai
  • , Y. Ban
  • , J. G. Bian
  • , X. Cai
  • , J. F. Chang
  • , H. F. Chen
  • , H. S. Chen
  • , J. Chen
  • , J. C. Chen
  • , Y. B. Chen
  • , S. P. Chi
  • , Y. P. Chu
  • , X. Z. Cui
  • , Y. M. Dai
  • , Y. S. Dai
  • , L. Y. Dong
  • , S. X. Du
  • , Z. Z. Du
  • , W. Dunwoodie
  • , J. Fang
    • S. S. Fang, C. D. Fu, H. Y. Fu, L. P. Fu, C. S. Gao, M. L. Gao, Y. N. Gao, M. Y. Gong, W. X. Gong, S. D. Gu, Y. N. Guo, Y. Q. Guo, Z. J. Guo, S. W. Han, F. A. Harris, J. He, K. L. He, M. He, X. He, Y. K. Heng, T. Hong, H. M. Hu, T. Hu, G. S. Huang, L. Huang, X. P. Huang, J. M. Izen, X. B. Ji, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, B. D. Jones, Z. J. Ke, D. Kong, Y. F. Lai, F. Li, G. Li, H. H. Li, J. Li, J. C. Li, K. Li, Q. J. Li, R. B. Li, R. Y. Li, W. Li, W. G. Li, X. Q. Li, X. S. Li, C. F. Liu, C. X. Liu, F. Liu, F. Liu, H. M. Liu, J. B. Liu, J. P. Liu, R. G. Liu, Y. Liu, Z. A. Liu, Z. X. Liu, X. C. Lou, G. R. Lu, F. Lu, H. J. Lu, J. G. Lu, Z. J. Lu, X. L. Luo, E. C. Ma, F. C. Ma, J. M. Ma, Z. P. Mao, X. C. Meng, X. H. Mo, J. Nie, Z. D. Nie, S. L. Olsen, D. Paluselli, H. P. Peng, N. D. Qi, C. D. Qian, J. F. Qiu, G. Rong, D. L. Shen, H. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, L. W. Song, H. S. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, S. Q. Tang, X. Tang, D. Tian, Y. R. Tian, G. L. Tong, G. S. Varner, J. Wang, J. Z. Wang, L. Wang, L. S. Wang, M. Wang, M. Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, Z. Wang, Z. Wang, Z. Wang, Z. Y. Wang, C. L. Wei, N. Wu, X. M. Xia, X. X. Xie, G. F. Xu, Y. Xu, S. T. Xue, M. L. Yan, W. B. Yan, G. A. Yang, H. X. Yang, J. Yang, S. D. Yang, M. H. Ye, Y. X. Ye, J. Ying, C. S. Yu, G. W. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. Y. Zhang, J. Zhang, J. M. Zhang, J. W. Zhang, L. S. Zhang, Q. J. Zhang, S. Q. Zhang, X. Y. Zhang, Y. J. Zhang, Y. Zhang, Y. Y. Zhang, Z. P. Zhang, D. X. Zhao, J. Zhao, J. W. Zhao, P. P. Zhao, W. R. Zhao, Y. B. Zhao, Z. G. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. C. Zhong, B. Q. Zhou, G. M. Zhou, L. Zhou, N. F. Zhou, K. J. Zhu, Q. M. Zhu, Y. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, B. S. Zou

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

In a sample of 58 million J/Ψevents collected with the BES II detector, the process J/Ψ → γηc is observed in five different decay channels: gamma;K+K-π+π-, γπ+π-π+π-, γK±KS0π± (with KS0 → π+π-), γφφ (with φ → K+K-) and γpp. From a combined fit of all five channels, we determine the mass and full-width of the ηc to be mηc = 2977.5 ± 1.0 (stat.) ± 1.2 (syst.) MeV/c2 and Γηc = 17.0 ± 3.7 (stat.) ± 7.4 (syst.) MeV/c2.

Original languageEnglish
Pages (from-to)174-180
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume555
Issue number3-4
DOIs
StatePublished - Feb 6 2003
Externally publishedYes

Funding

The BES Collaboration expresses their thanks for the hard efforts of the staff of BEPC. This work is supported in part by the National Natural Science Foundation of China under contract No. 19991480, the Chinese Academy of Sciences under contract No. KJ 95T-03, the 100 Talents Program of CAS under Contract Nos. U-24, U-25, and the Knowledge Innovation Project of CAS under Contract Nos. U-602, U-34(IHEP); by the National Natural Science Foundation of China under contract No. 10175060(USTC); and by the Department of Energy under Contract Nos. DE-AC03-76SF00515 (SLAC), DE-FG03-94ER40833 (U Hawaii), DE-FG03-95ER40925 (UT Dallas).

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