Measurement of the mass and full width of the ηc meson

J. Z. Bai; Y. Ban; J. G. Bian; I. Blum; A. D. Chen; G. P. Chen; H. F. Chen; H. S. Chen; J. Chen; J. C. Chen; X. D. Chen; Y. Chen; Y. B. Chen; B. S. Cheng; J. B. Choi; X. Z. Cui; H. L. Ding; L. Y. Dong; Z. Z. Du; W. Dunwoodie; C. S. Gao; M. L. Gao; S. Q. Gao; P. Gratton; J. H. Gu; S. D. Gu; W. X. Gu; Y. N. Guo; Z. J. Guo; S. W. Han; Y. Han; F. A. Harris; J. He; J. T. He; K. L. He; M. He; Y. K. Heng; D. G. Hitlin; G. Y. Hu; H. M. Hu; J. L. Hu; Q. H. Hu; T. Hu; G. S. Huang; X. P. Huang; Y. Z. Huang; J. M. Izen; C. H. Jiang; Y. Jin; B. D. Jones; X. Ju; J. S. Kang; Z. J. Ke; M. H. Kelsey; B. K. Kim; H. J. Kim; S. K. Kim; T. Y. Kim; D. Kong; Y. F. Lai; P. F. Lang; A. Lankford; C. G. Li; D. Li; H. B. Li; J. Li; J. C. Li; P. Q. Li; W. Li; W. G. Li; X. H. Li; X. N. Li; X. Q. Li; Z. C. Li; B. Liu; F. Liu; Feng Liu; H. M. Liu; J. Liu; J. P. Liu; R. G. Liu; Y. Liu; Z. X. Liu; X. C. Lou; B. Lowery; G. R. Lu; F. Lu; J. G. Lu; X. L. Luo; E. C. Ma; J. M. Ma; R. Malchow; H. S. Mao; Z. P. Mao; X. C. Meng; X. H. Mo; J. Nie; S. L. Olsen; J. Oyang; D. Paluselli; L. J. Pan; J. Panetta; H. Park; F. Porter; N. D. Qi; X. R. Qi; C. D. Qian; J. F. Qiu; Y. H. Qu; Y. K. Que; G. Rong; M. Schernau; Y. Y. Shao; B. W. Shen; D. L. Shen; H. Shen; H. Y. Shen; X. Y. Shen; F. Shi; H. Z. Shi; X. F. Song; J. Standifird; J. Y. Suh; H. S. Sun; L. F. Sun; Y. Z. Sun; S. Q. Tang; W. Toki; G. L. Tong; G. S. Varner; F. Wang; L. Wang; L. S. Wang; L. Z. Wang; P. Wang; P. L. Wang; S. M. Wang; Y. Y. Wang; Z. Y. Wang; M. Weaver; C. L. Wei; N. Wu; Y. G. Wu; D. M. Xi; X. M. Xia; Y. Xie; Y. H. Xie; G. F. Xu; S. T. Xue; J. Yan; W. G. Yan; C. M. Yang; C. Y. Yang; H. X. Yang; W. Yang; X. F. Yang; M. H. Ye; S. W. Ye; Y. X. Ye; C. S. Yu; C. X. Yu; G. W. Yu; Y. H. Yu; Z. Q. Yu; C. Z. Yuan; Y. Yuan; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; Dehong Zhang; H. L. Zhang; J. Zhang; J. W. Zhang; L. Zhang; Lei Zhang; L. S. Zhang; P. Zhang; Q. J. Zhang; S. Q. Zhang; X. Y. Zhang; Y. Y. Zhang; D. X. Zhao; H. W. Zhao; Jiawei Zhao; J. W. Zhao; M. Zhao; W. R. Zhao; Z. G. Zhao; J. P. Zheng; L. S. Zheng; Y. H. Zheng; Z. P. Zheng; B. Q. Zhou; L. Zhou; K. J. Zhu; Q. M. Zhu; Y. C. Zhu; Y. S. Zhu; Z. A. Zhu; B. A. Zhuang

doi:10.1103/PhysRevD.62.072001

Measurement of the mass and full width of the η_c meson

J. Z. Bai, Y. Ban, J. G. Bian, I. Blum, A. D. Chen, G. P. Chen, H. F. Chen, H. S. Chen, J. Chen, J. C. Chen, X. D. Chen, Y. Chen, Y. B. Chen, B. S. Cheng, J. B. Choi, X. Z. Cui, H. L. Ding, L. Y. Dong, Z. Z. Du, W. DunwoodieC. S. Gao, M. L. Gao, S. Q. Gao, P. Gratton, J. H. Gu, S. D. Gu, W. X. Gu, Y. N. Guo, Z. J. Guo, S. W. Han, Y. Han, F. A. Harris, J. He, J. T. He, K. L. He, M. He, Y. K. Heng, D. G. Hitlin, G. Y. Hu, H. M. Hu, J. L. Hu, Q. H. Hu, T. Hu, G. S. Huang, X. P. Huang, Y. Z. Huang, J. M. Izen, C. H. Jiang, Y. Jin, B. D. Jones, X. Ju, J. S. Kang, Z. J. Ke, M. H. Kelsey, B. K. Kim, H. J. Kim, S. K. Kim, T. Y. Kim, D. Kong, Y. F. Lai, P. F. Lang, A. Lankford, C. G. Li, D. Li, H. B. Li, J. Li, J. C. Li, P. Q. Li, W. Li, W. G. Li, X. H. Li, X. N. Li, X. Q. Li, Z. C. Li, B. Liu, F. Liu, Feng Liu, H. M. Liu, J. Liu, J. P. Liu, R. G. Liu, Y. Liu, Z. X. Liu, X. C. Lou, B. Lowery, G. R. Lu, F. Lu, J. G. Lu, X. L. Luo, E. C. Ma, J. M. Ma, R. Malchow, H. S. Mao, Z. P. Mao, X. C. Meng, X. H. Mo, J. Nie, S. L. Olsen, J. Oyang, D. Paluselli, L. J. Pan, J. Panetta, H. Park, F. Porter, N. D. Qi, X. R. Qi, C. D. Qian, J. F. Qiu, Y. H. Qu, Y. K. Que, G. Rong, M. Schernau, Y. Y. Shao, B. W. Shen, D. L. Shen, H. Shen, H. Y. Shen, X. Y. Shen, F. Shi, H. Z. Shi, X. F. Song, J. Standifird, J. Y. Suh, H. S. Sun, L. F. Sun, Y. Z. Sun, S. Q. Tang, W. Toki, G. L. Tong, G. S. Varner, F. Wang, L. Wang, L. S. Wang, L. Z. Wang, P. Wang, P. L. Wang, S. M. Wang, Y. Y. Wang, Z. Y. Wang, M. Weaver, C. L. Wei, N. Wu, Y. G. Wu, D. M. Xi, X. M. Xia, Y. Xie, Y. H. Xie, G. F. Xu, S. T. Xue, J. Yan, W. G. Yan, C. M. Yang, C. Y. Yang, H. X. Yang, W. Yang, X. F. Yang, M. H. Ye, S. W. Ye, Y. X. Ye, C. S. Yu, C. X. Yu, G. W. Yu, Y. H. Yu, Z. Q. Yu, C. Z. Yuan, Y. Yuan, B. Y. Zhang, C. Zhang, C. C. Zhang, D. H. Zhang, Dehong Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, L. Zhang, Lei Zhang, L. S. Zhang, P. Zhang, Q. J. Zhang, S. Q. Zhang, X. Y. Zhang, Y. Y. Zhang, D. X. Zhao, H. W. Zhao, Jiawei Zhao, J. W. Zhao, M. Zhao, W. R. Zhao, Z. G. Zhao, J. P. Zheng, L. S. Zheng, Y. H. Zheng, Z. P. Zheng, B. Q. Zhou, L. Zhou, K. J. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang

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

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Abstract

In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ→γη_c is observed for five different η_c decay channels: K⁺K^-π⁺π^-, π⁺π^-π⁺π^-, K±K_S⁰π∓ (with K_S⁰→π⁺π^-), φφ (with φ→K⁺K^-) and K⁺K^-π⁰. From these signals, we determine the mass of η_c to be 2976.6±2.9 ±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γη_c detected in the same spectrometer gives m_ηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γ_ηc=11.0±8.1±4.1 MeV.

Original language	English
Article number	072001
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review D
Volume	62
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.62.072001
State	Published - 1 Oct 2000

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10.1103/PhysRevD.62.072001

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Bai, J. Z., Ban, Y., Bian, J. G., Blum, I., Chen, A. D., Chen, G. P., Chen, H. F., Chen, H. S., Chen, J., Chen, J. C., Chen, X. D., Chen, Y., Chen, Y. B., Cheng, B. S., Choi, J. B., Cui, X. Z., Ding, H. L., Dong, L. Y., Du, Z. Z., ... Zhuang, B. A. (2000). Measurement of the mass and full width of the η_c meson. Physical Review D, 62(7), 1-5. Article 072001. https://doi.org/10.1103/PhysRevD.62.072001

@article{ddab56b396fb46729ad6fecd16eddd46,

title = "Measurement of the mass and full width of the ηc meson",

abstract = "In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ→γηc is observed for five different ηc decay channels: K+K-π+π-, π+π-π+π-, K±KS0π∓ (with KS0→π+π-), φφ (with φ→K+K-) and K+K-π0. From these signals, we determine the mass of ηc to be 2976.6±2.9 ±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γηc detected in the same spectrometer gives mηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γηc=11.0±8.1±4.1 MeV.",

author = "Bai, {J. Z.} and Y. Ban and Bian, {J. G.} and I. Blum and Chen, {A. D.} and Chen, {G. P.} and Chen, {H. F.} and Chen, {H. S.} and J. Chen and Chen, {J. C.} and Chen, {X. D.} and Y. Chen and Chen, {Y. B.} and Cheng, {B. S.} and Choi, {J. B.} and Cui, {X. Z.} and Ding, {H. L.} and Dong, {L. Y.} and Du, {Z. Z.} and W. Dunwoodie and Gao, {C. S.} and Gao, {M. L.} and Gao, {S. Q.} and P. Gratton and Gu, {J. H.} and Gu, {S. D.} and Gu, {W. X.} and Guo, {Y. N.} and Guo, {Z. J.} and Han, {S. W.} and Y. Han and Harris, {F. A.} and J. He and He, {J. T.} and He, {K. L.} and M. He and Heng, {Y. K.} and Hitlin, {D. G.} and Hu, {G. Y.} and Hu, {H. M.} and Hu, {J. L.} and Hu, {Q. H.} and T. Hu and Huang, {G. S.} and Huang, {X. P.} and Huang, {Y. Z.} and Izen, {J. M.} and Jiang, {C. H.} and Y. Jin and Jones, {B. D.} and X. Ju and Kang, {J. S.} and Ke, {Z. J.} and Kelsey, {M. H.} and Kim, {B. K.} and Kim, {H. J.} and Kim, {S. K.} and Kim, {T. Y.} and D. Kong and Lai, {Y. F.} and Lang, {P. F.} and A. Lankford and Li, {C. G.} and D. Li and Li, {H. B.} and J. Li and Li, {J. C.} and Li, {P. Q.} and W. Li and Li, {W. G.} and Li, {X. H.} and Li, {X. N.} and Li, {X. Q.} and Li, {Z. C.} and B. Liu and F. Liu and Feng Liu and Liu, {H. M.} and J. Liu and Liu, {J. P.} and Liu, {R. G.} and Y. Liu and Liu, {Z. X.} and Lou, {X. C.} and B. Lowery and Lu, {G. R.} and F. Lu and Lu, {J. G.} and Luo, {X. L.} and Ma, {E. C.} and Ma, {J. M.} and R. Malchow and Mao, {H. S.} and Mao, {Z. P.} and Meng, {X. C.} and Mo, {X. H.} and J. Nie and Olsen, {S. L.} and J. Oyang and D. Paluselli and Pan, {L. J.} and J. Panetta and H. Park and F. Porter and Qi, {N. D.} and Qi, {X. R.} and Qian, {C. D.} and Qiu, {J. F.} and Qu, {Y. H.} and Que, {Y. K.} and G. Rong and M. Schernau and Shao, {Y. Y.} and Shen, {B. W.} and Shen, {D. L.} and H. Shen and Shen, {H. Y.} and Shen, {X. Y.} and F. Shi and Shi, {H. Z.} and Song, {X. F.} and J. Standifird and Suh, {J. Y.} and Sun, {H. S.} and Sun, {L. F.} and Sun, {Y. Z.} and Tang, {S. Q.} and W. Toki and Tong, {G. L.} and Varner, {G. S.} and F. Wang and L. Wang and Wang, {L. S.} and Wang, {L. Z.} and P. Wang and Wang, {P. L.} and Wang, {S. M.} and Wang, {Y. Y.} and Wang, {Z. Y.} and M. Weaver and Wei, {C. L.} and N. Wu and Wu, {Y. G.} and Xi, {D. M.} and Xia, {X. M.} and Y. Xie and Xie, {Y. H.} and Xu, {G. F.} and Xue, {S. T.} and J. Yan and Yan, {W. G.} and Yang, {C. M.} and Yang, {C. Y.} and Yang, {H. X.} and W. Yang and Yang, {X. F.} and Ye, {M. H.} and Ye, {S. W.} and Ye, {Y. X.} and Yu, {C. S.} and Yu, {C. X.} and Yu, {G. W.} and Yu, {Y. H.} and Yu, {Z. Q.} and Yuan, {C. Z.} and Y. Yuan and Zhang, {B. Y.} and C. Zhang and Zhang, {C. C.} and Zhang, {D. H.} and Dehong Zhang and Zhang, {H. L.} and J. Zhang and Zhang, {J. W.} and L. Zhang and Lei Zhang and Zhang, {L. S.} and P. Zhang and Zhang, {Q. J.} and Zhang, {S. Q.} and Zhang, {X. Y.} and Zhang, {Y. Y.} and Zhao, {D. X.} and Zhao, {H. W.} and Jiawei Zhao and Zhao, {J. W.} and M. Zhao and Zhao, {W. R.} and Zhao, {Z. G.} and Zheng, {J. P.} and Zheng, {L. S.} and Zheng, {Y. H.} and Zheng, {Z. P.} and Zhou, {B. Q.} and L. Zhou and Zhu, {K. J.} and Zhu, {Q. M.} and Zhu, {Y. C.} and Zhu, {Y. S.} and Zhu, {Z. A.} and Zhuang, {B. A.}",

year = "2000",

month = oct,

day = "1",

doi = "10.1103/PhysRevD.62.072001",

language = "English",

volume = "62",

pages = "1--5",

journal = "Physical Review D",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "7",

}

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, AD, Chen, GP, Chen, HF, Chen, HS, Chen, J, Chen, JC, Chen, XD, Chen, Y, Chen, YB, Cheng, BS, Choi, JB, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Huang, GS, Huang, XP, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Kang, JS, Ke, ZJ, Kelsey, MH, Kim, BK, Kim, HJ, Kim, SK, Kim, TY, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, W, Li, WG, Li, XH, Li, XN, Li, XQ, Li, ZC, Liu, B, Liu, F, Liu, F, Liu, HM, Liu, J, Liu, JP, Liu, RG, Liu, Y, Liu, ZX, Lou, XC, Lowery, B, Lu, GR, Lu, F, Lu, JG, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Mo, XH, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Park, H, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, Shen, DL, Shen, H, Shen, HY, Shen, XY, Shi, F, Shi, HZ, Song, XF, Standifird, J, Suh, JY, Sun, HS, Sun, LF, Sun, YZ, Tang, SQ, Toki, W, Tong, GL, Varner, GS, Wang, F, Wang, L, Wang, LS, Wang, LZ, Wang, P, Wang, PL, Wang, SM, Wang, YY, Wang, ZY, Weaver, M, Wei, CL, Wu, N, Wu, YG, Xi, DM, Xia, XM, Xie, Y, Xie, YH, Xu, GF, Xue, ST, Yan, J, Yan, WG, Yang, CM, Yang, CY, Yang, HX, Yang, W, Yang, XF, Ye, MH, Ye, SW, Ye, YX, Yu, CS, Yu, CX, Yu, GW, Yu, YH, Yu, ZQ, Yuan, CZ, Yuan, Y, Zhang, BY, Zhang, C, Zhang, CC, Zhang, DH, Zhang, D, Zhang, HL, Zhang, J, Zhang, JW, Zhang, L, Zhang, L, Zhang, LS, Zhang, P, Zhang, QJ, Zhang, SQ, Zhang, XY, Zhang, YY, Zhao, DX, Zhao, HW, Zhao, J, Zhao, JW, Zhao, M, Zhao, WR, Zhao, ZG, Zheng, JP, Zheng, LS, Zheng, YH, Zheng, ZP, Zhou, BQ, Zhou, L, Zhu, KJ, Zhu, QM, Zhu, YC, Zhu, YS, Zhu, ZA & Zhuang, BA 2000, 'Measurement of the mass and full width of the η_c meson', Physical Review D, vol. 62, no. 7, 072001, pp. 1-5. https://doi.org/10.1103/PhysRevD.62.072001

TY - JOUR

T1 - Measurement of the mass and full width of the ηc meson

AU - Bai, J. Z.

AU - Ban, Y.

AU - Bian, J. G.

AU - Blum, I.

AU - Chen, A. D.

AU - Chen, G. P.

AU - Chen, H. F.

AU - Chen, H. S.

AU - Chen, J.

AU - Chen, J. C.

AU - Chen, X. D.

AU - Chen, Y.

AU - Chen, Y. B.

AU - Cheng, B. S.

AU - Choi, J. B.

AU - Cui, X. Z.

AU - Ding, H. L.

AU - Dong, L. Y.

AU - Du, Z. Z.

AU - Dunwoodie, W.

AU - Gao, C. S.

AU - Gao, M. L.

AU - Gao, S. Q.

AU - Gratton, P.

AU - Gu, J. H.

AU - Gu, S. D.

AU - Gu, W. X.

AU - Guo, Y. N.

AU - Guo, Z. J.

AU - Han, S. W.

AU - Han, Y.

AU - Harris, F. A.

AU - He, J.

AU - He, J. T.

AU - He, K. L.

AU - He, M.

AU - Heng, Y. K.

AU - Hitlin, D. G.

AU - Hu, G. Y.

AU - Hu, H. M.

AU - Hu, J. L.

AU - Hu, Q. H.

AU - Hu, T.

AU - Huang, G. S.

AU - Huang, X. P.

AU - Huang, Y. Z.

AU - Izen, J. M.

AU - Jiang, C. H.

AU - Jin, Y.

AU - Jones, B. D.

AU - Ju, X.

AU - Kang, J. S.

AU - Ke, Z. J.

AU - Kelsey, M. H.

AU - Kim, B. K.

AU - Kim, H. J.

AU - Kim, S. K.

AU - Kim, T. Y.

AU - Kong, D.

AU - Lai, Y. F.

AU - Lang, P. F.

AU - Lankford, A.

AU - Li, C. G.

AU - Li, D.

AU - Li, H. B.

AU - Li, J.

AU - Li, J. C.

AU - Li, P. Q.

AU - Li, W.

AU - Li, W. G.

AU - Li, X. H.

AU - Li, X. N.

AU - Li, X. Q.

AU - Li, Z. C.

AU - Liu, B.

AU - Liu, F.

AU - Liu, Feng

AU - Liu, H. M.

AU - Liu, J.

AU - Liu, J. P.

AU - Liu, R. G.

AU - Liu, Y.

AU - Liu, Z. X.

AU - Lou, X. C.

AU - Lowery, B.

AU - Lu, G. R.

AU - Lu, F.

AU - Lu, J. G.

AU - Luo, X. L.

AU - Ma, E. C.

AU - Ma, J. M.

AU - Malchow, R.

AU - Mao, H. S.

AU - Mao, Z. P.

AU - Meng, X. C.

AU - Mo, X. H.

AU - Nie, J.

AU - Olsen, S. L.

AU - Oyang, J.

AU - Paluselli, D.

AU - Pan, L. J.

AU - Panetta, J.

AU - Park, H.

AU - Porter, F.

AU - Qi, N. D.

AU - Qi, X. R.

AU - Qian, C. D.

AU - Qiu, J. F.

AU - Qu, Y. H.

AU - Que, Y. K.

AU - Rong, G.

AU - Schernau, M.

AU - Shao, Y. Y.

AU - Shen, B. W.

AU - Shen, D. L.

AU - Shen, H.

AU - Shen, H. Y.

AU - Shen, X. Y.

AU - Shi, F.

AU - Shi, H. Z.

AU - Song, X. F.

AU - Standifird, J.

AU - Suh, J. Y.

AU - Sun, H. S.

AU - Sun, L. F.

AU - Sun, Y. Z.

AU - Tang, S. Q.

AU - Toki, W.

AU - Tong, G. L.

AU - Varner, G. S.

AU - Wang, F.

AU - Wang, L.

AU - Wang, L. S.

AU - Wang, L. Z.

AU - Wang, P.

AU - Wang, P. L.

AU - Wang, S. M.

AU - Wang, Y. Y.

AU - Wang, Z. Y.

AU - Weaver, M.

AU - Wei, C. L.

AU - Wu, N.

AU - Wu, Y. G.

AU - Xi, D. M.

AU - Xia, X. M.

AU - Xie, Y.

AU - Xie, Y. H.

AU - Xu, G. F.

AU - Xue, S. T.

AU - Yan, J.

AU - Yan, W. G.

AU - Yang, C. M.

AU - Yang, C. Y.

AU - Yang, H. X.

AU - Yang, W.

AU - Yang, X. F.

AU - Ye, M. H.

AU - Ye, S. W.

AU - Ye, Y. X.

AU - Yu, C. S.

AU - Yu, C. X.

AU - Yu, G. W.

AU - Yu, Y. H.

AU - Yu, Z. Q.

AU - Yuan, C. Z.

AU - Yuan, Y.

AU - Zhang, B. Y.

AU - Zhang, C.

AU - Zhang, C. C.

AU - Zhang, D. H.

AU - Zhang, Dehong

AU - Zhang, H. L.

AU - Zhang, J.

AU - Zhang, J. W.

AU - Zhang, L.

AU - Zhang, Lei

AU - Zhang, L. S.

AU - Zhang, P.

AU - Zhang, Q. J.

AU - Zhang, S. Q.

AU - Zhang, X. Y.

AU - Zhang, Y. Y.

AU - Zhao, D. X.

AU - Zhao, H. W.

AU - Zhao, Jiawei

AU - Zhao, J. W.

AU - Zhao, M.

AU - Zhao, W. R.

AU - Zhao, Z. G.

AU - Zheng, J. P.

AU - Zheng, L. S.

AU - Zheng, Y. H.

AU - Zheng, Z. P.

AU - Zhou, B. Q.

AU - Zhou, L.

AU - Zhu, K. J.

AU - Zhu, Q. M.

AU - Zhu, Y. C.

AU - Zhu, Y. S.

AU - Zhu, Z. A.

AU - Zhuang, B. A.

PY - 2000/10/1

Y1 - 2000/10/1

N2 - In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ→γηc is observed for five different ηc decay channels: K+K-π+π-, π+π-π+π-, K±KS0π∓ (with KS0→π+π-), φφ (with φ→K+K-) and K+K-π0. From these signals, we determine the mass of ηc to be 2976.6±2.9 ±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γηc detected in the same spectrometer gives mηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γηc=11.0±8.1±4.1 MeV.

AB - In a sample of 7.8 million J/ψ decays collected in the Beijing Spectrometer, the process J/ψ→γηc is observed for five different ηc decay channels: K+K-π+π-, π+π-π+π-, K±KS0π∓ (with KS0→π+π-), φφ (with φ→K+K-) and K+K-π0. From these signals, we determine the mass of ηc to be 2976.6±2.9 ±1.3 MeV. Combining this result with a previously reported result from a similar study using ψ(2S)→γηc detected in the same spectrometer gives mηc=2976.3±2.3±1.2 MeV. For the combined samples, we obtain Γηc=11.0±8.1±4.1 MeV.

UR - http://www.scopus.com/inward/record.url?scp=17944368189&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.62.072001

DO - 10.1103/PhysRevD.62.072001

M3 - Article

AN - SCOPUS:17944368189

SN - 0556-2821

VL - 62

SP - 1

EP - 5

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - 072001

ER -

Measurement of the mass and full width of the η_c meson

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