Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays

J. Z. Bai; Y. Ban; J. G. Bian; X. Cai; J. F. Chang; H. F. Chen; H. S. Chen; J. Chen; Jie 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; Fang 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; R. Malchow; 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; W. Toki; G. L. Tong; G. S. Varner; J. Wang; J. Z. Wang; L. Wang; L. S. Wang; M. Wang; Meng Wang; P. Wang; P. L. Wang; W. F. Wang; Y. F. Wang; Zhe Wang; Z. Wang; Zheng 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; Yiyun Zhang; Y. Y. Zhang; Z. P. Zhang; D. X. Zhao; Jiawei 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; Yingchun Zhu; Y. C. Zhu; Y. S. Zhu; Z. A. Zhu; B. A. Zhuang; B. S. Zou

doi:10.1103/PhysRevLett.91.022001

Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays

J. Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. F. Chang, H. F. Chen, H. S. Chen, J. Chen, Jie 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. DunwoodieJ. 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, Fang 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, R. Malchow, 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, W. Toki, G. L. Tong, G. S. Varner, J. Wang, J. Z. Wang, L. Wang, L. S. Wang, M. Wang, Meng Wang, P. Wang, P. L. Wang, W. F. Wang, Y. F. Wang, Zhe Wang, Z. Wang, Zheng 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, Yiyun Zhang, Y. Y. Zhang, Z. P. Zhang, D. X. Zhao, Jiawei 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, Yingchun Zhu, Y. C. Zhu, Y. S. Zhu, Z. A. Zhu, B. A. Zhuang, B. S. Zou

Triple-Axis

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

15 Scopus citations

Abstract

We observe a narrow enhancement near [Formula presented] in the invariant mass spectrum of [Formula presented] pairs from radiative [Formula presented] decays. No similar structure is seen in [Formula presented] decays. The results are based on an analysis of a [Formula presented] event sample of [Formula presented] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an [Formula presented]- or [Formula presented]-wave Breit-Wigner resonance function. In the case of the [Formula presented]-wave fit, the peak mass is below [Formula presented] at [Formula presented] and the total width is [Formula presented] at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.

Original language	English
Journal	Physical Review Letters
Volume	91
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.91.022001
State	Published - Jul 10 2003

Access to Document

10.1103/PhysRevLett.91.022001

Cite this

Bai, J. Z., Ban, Y., Bian, J. G., Cai, X., Chang, J. F., Chen, H. F., Chen, H. S., Chen, J., Chen, J., Chen, J. C., Chen, Y. B., Chi, S. P., Chu, Y. P., Cui, X. Z., Dai, Y. M., Dai, Y. S., Dong, L. Y., Du, S. X., Du, Z. Z., ... Zou, B. S. (2003). Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays. Physical Review Letters, 91(2). https://doi.org/10.1103/PhysRevLett.91.022001

@article{d2273a3bfcb54144a79c4dc636177846,

title = "Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays",

abstract = "We observe a narrow enhancement near [Formula presented] in the invariant mass spectrum of [Formula presented] pairs from radiative [Formula presented] decays. No similar structure is seen in [Formula presented] decays. The results are based on an analysis of a [Formula presented] event sample of [Formula presented] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an [Formula presented]- or [Formula presented]-wave Breit-Wigner resonance function. In the case of the [Formula presented]-wave fit, the peak mass is below [Formula presented] at [Formula presented] and the total width is [Formula presented] at the 90\% confidence level. These mass and width values are not consistent with the properties of any known particle.",

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

year = "2003",

month = jul,

day = "10",

doi = "10.1103/PhysRevLett.91.022001",

language = "English",

volume = "91",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "2",

}

Bai, JZ, Ban, Y, Bian, JG, Cai, X, Chang, JF, Chen, HF, Chen, HS, Chen, J, Chen, J, Chen, JC, Chen, YB, Chi, SP, Chu, YP, Cui, XZ, Dai, YM, Dai, YS, Dong, LY, Du, SX, Du, ZZ, Dunwoodie, W, Fang, J, Fang, SS, Fu, CD, Fu, HY, Fu, LP, Gao, CS, Gao, ML, Gao, YN, Gong, MY, Gong, WX, Gu, SD, Guo, YN, Guo, YQ, Guo, ZJ, Han, SW, Harris, FA, He, J, He, KL, He, M, He, X, Heng, YK, Hong, T, Hu, HM, Hu, T, Huang, GS, Huang, L, Huang, XP, Izen, JM, Ji, XB, Jiang, CH, Jiang, XS, Jin, DP, Jin, S, Jin, Y, Jones, BD, Ke, ZJ, Kong, D, Lai, YF, Li, F, Li, G, Li, HH, Li, J, Li, JC, Li, K, Li, QJ, Li, RB, Li, RY, Li, W, Li, WG, Li, XQ, Li, XS, Liu, CF, Liu, CX, Liu, F, Liu, F, Liu, HM, Liu, JB, Liu, JP, Liu, RG, Liu, Y, Liu, ZA, Liu, ZX, Lou, XC, Lu, GR, Lu, F, Lu, HJ, Lu, JG, Lu, ZJ, Luo, XL, Ma, EC, Ma, FC, Ma, JM, Malchow, R, Mao, ZP, Meng, XC, Mo, XH, Nie, J, Nie, ZD, Olsen, SL, Paluselli, D, Peng, HP, Qi, ND, Qian, CD, Qiu, JF, Rong, G, Shen, DL, Shen, H, Shen, XY, Sheng, HY, Shi, F, Song, LW, Sun, HS, Sun, SS, Sun, YZ, Sun, ZJ, Tang, SQ, Tang, X, Tian, D, Tian, YR, Toki, W, Tong, GL, Varner, GS, Wang, J, Wang, JZ, Wang, L, Wang, LS, Wang, M, Wang, M, Wang, P, Wang, PL, Wang, WF, Wang, YF, Wang, Z, Wang, Z, Wang, Z, Wang, ZY, Wei, CL, Wu, N, Xia, XM, Xie, XX, Xu, GF, Xu, Y, Xue, ST, Yan, ML, Yan, WB, Yang, GA, Yang, HX, Yang, J, Yang, SD, Ye, MH, Ye, YX, Ying, J, Yu, CS, Yu, GW, Yuan, CZ, Yuan, JM, Yuan, Y, Yue, Q, Zang, SL, Zeng, Y, Zhang, BX, Zhang, BY, Zhang, CC, Zhang, DH, Zhang, HY, Zhang, J, Zhang, JM, Zhang, JW, Zhang, LS, Zhang, QJ, Zhang, SQ, Zhang, XY, Zhang, YJ, Zhang, Y, Zhang, YY, Zhang, ZP, Zhao, DX, Zhao, J, Zhao, JW, Zhao, PP, Zhao, WR, Zhao, YB, Zhao, ZG, Zheng, JP, Zheng, LS, Zheng, ZP, Zhong, XC, Zhou, BQ, Zhou, GM, Zhou, L, Zhou, NF, Zhu, KJ, Zhu, QM, Zhu, Y, Zhu, YC, Zhu, YS, Zhu, ZA, Zhuang, BA & Zou, BS 2003, 'Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays', Physical Review Letters, vol. 91, no. 2. https://doi.org/10.1103/PhysRevLett.91.022001

TY - JOUR

T1 - Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays

AU - Bai, J. Z.

AU - Ban, Y.

AU - Bian, J. G.

AU - Cai, X.

AU - Chang, J. F.

AU - Chen, H. F.

AU - Chen, H. S.

AU - Chen, J.

AU - Chen, Jie

AU - Chen, J. C.

AU - Chen, Y. B.

AU - Chi, S. P.

AU - Chu, Y. P.

AU - Cui, X. Z.

AU - Dai, Y. M.

AU - Dai, Y. S.

AU - Dong, L. Y.

AU - Du, S. X.

AU - Du, Z. Z.

AU - Dunwoodie, W.

AU - Fang, J.

AU - Fang, S. S.

AU - Fu, C. D.

AU - Fu, H. Y.

AU - Fu, L. P.

AU - Gao, C. S.

AU - Gao, M. L.

AU - Gao, Y. N.

AU - Gong, M. Y.

AU - Gong, W. X.

AU - Gu, S. D.

AU - Guo, Y. N.

AU - Guo, Y. Q.

AU - Guo, Z. J.

AU - Han, S. W.

AU - Harris, F. A.

AU - He, J.

AU - He, K. L.

AU - He, M.

AU - He, X.

AU - Heng, Y. K.

AU - Hong, T.

AU - Hu, H. M.

AU - Hu, T.

AU - Huang, G. S.

AU - Huang, L.

AU - Huang, X. P.

AU - Izen, J. M.

AU - Ji, X. B.

AU - Jiang, C. H.

AU - Jiang, X. S.

AU - Jin, D. P.

AU - Jin, S.

AU - Jin, Y.

AU - Jones, B. D.

AU - Ke, Z. J.

AU - Kong, D.

AU - Lai, Y. F.

AU - Li, F.

AU - Li, G.

AU - Li, H. H.

AU - Li, J.

AU - Li, J. C.

AU - Li, K.

AU - Li, Q. J.

AU - Li, R. B.

AU - Li, R. Y.

AU - Li, W.

AU - Li, W. G.

AU - Li, X. Q.

AU - Li, X. S.

AU - Liu, C. F.

AU - Liu, C. X.

AU - Liu, Fang

AU - Liu, F.

AU - Liu, H. M.

AU - Liu, J. B.

AU - Liu, J. P.

AU - Liu, R. G.

AU - Liu, Y.

AU - Liu, Z. A.

AU - Liu, Z. X.

AU - Lou, X. C.

AU - Lu, G. R.

AU - Lu, F.

AU - Lu, H. J.

AU - Lu, J. G.

AU - Lu, Z. J.

AU - Luo, X. L.

AU - Ma, E. C.

AU - Ma, F. C.

AU - Ma, J. M.

AU - Malchow, R.

AU - Mao, Z. P.

AU - Meng, X. C.

AU - Mo, X. H.

AU - Nie, J.

AU - Nie, Z. D.

AU - Olsen, S. L.

AU - Paluselli, D.

AU - Peng, H. P.

AU - Qi, N. D.

AU - Qian, C. D.

AU - Qiu, J. F.

AU - Rong, G.

AU - Shen, D. L.

AU - Shen, H.

AU - Shen, X. Y.

AU - Sheng, H. Y.

AU - Shi, F.

AU - Song, L. W.

AU - Sun, H. S.

AU - Sun, S. S.

AU - Sun, Y. Z.

AU - Sun, Z. J.

AU - Tang, S. Q.

AU - Tang, X.

AU - Tian, D.

AU - Tian, Y. R.

AU - Toki, W.

AU - Tong, G. L.

AU - Varner, G. S.

AU - Wang, J.

AU - Wang, J. Z.

AU - Wang, L.

AU - Wang, L. S.

AU - Wang, M.

AU - Wang, Meng

AU - Wang, P.

AU - Wang, P. L.

AU - Wang, W. F.

AU - Wang, Y. F.

AU - Wang, Zhe

AU - Wang, Z.

AU - Wang, Zheng

AU - Wang, Z. Y.

AU - Wei, C. L.

AU - Wu, N.

AU - Xia, X. M.

AU - Xie, X. X.

AU - Xu, G. F.

AU - Xu, Y.

AU - Xue, S. T.

AU - Yan, M. L.

AU - Yan, W. B.

AU - Yang, G. A.

AU - Yang, H. X.

AU - Yang, J.

AU - Yang, S. D.

AU - Ye, M. H.

AU - Ye, Y. X.

AU - Ying, J.

AU - Yu, C. S.

AU - Yu, G. W.

AU - Yuan, C. Z.

AU - Yuan, J. M.

AU - Yuan, Y.

AU - Yue, Q.

AU - Zang, S. L.

AU - Zeng, Y.

AU - Zhang, B. X.

AU - Zhang, B. Y.

AU - Zhang, C. C.

AU - Zhang, D. H.

AU - Zhang, H. Y.

AU - Zhang, J.

AU - Zhang, J. M.

AU - Zhang, J. W.

AU - Zhang, L. S.

AU - Zhang, Q. J.

AU - Zhang, S. Q.

AU - Zhang, X. Y.

AU - Zhang, Y. J.

AU - Zhang, Yiyun

AU - Zhang, Y. Y.

AU - Zhang, Z. P.

AU - Zhao, D. X.

AU - Zhao, Jiawei

AU - Zhao, J. W.

AU - Zhao, P. P.

AU - Zhao, W. R.

AU - Zhao, Y. B.

AU - Zhao, Z. G.

AU - Zheng, J. P.

AU - Zheng, L. S.

AU - Zheng, Z. P.

AU - Zhong, X. C.

AU - Zhou, B. Q.

AU - Zhou, G. M.

AU - Zhou, L.

AU - Zhou, N. F.

AU - Zhu, K. J.

AU - Zhu, Q. M.

AU - Zhu, Yingchun

AU - Zhu, Y. C.

AU - Zhu, Y. S.

AU - Zhu, Z. A.

AU - Zhuang, B. A.

AU - Zou, B. S.

PY - 2003/7/10

Y1 - 2003/7/10

N2 - We observe a narrow enhancement near [Formula presented] in the invariant mass spectrum of [Formula presented] pairs from radiative [Formula presented] decays. No similar structure is seen in [Formula presented] decays. The results are based on an analysis of a [Formula presented] event sample of [Formula presented] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an [Formula presented]- or [Formula presented]-wave Breit-Wigner resonance function. In the case of the [Formula presented]-wave fit, the peak mass is below [Formula presented] at [Formula presented] and the total width is [Formula presented] at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.

AB - We observe a narrow enhancement near [Formula presented] in the invariant mass spectrum of [Formula presented] pairs from radiative [Formula presented] decays. No similar structure is seen in [Formula presented] decays. The results are based on an analysis of a [Formula presented] event sample of [Formula presented] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an [Formula presented]- or [Formula presented]-wave Breit-Wigner resonance function. In the case of the [Formula presented]-wave fit, the peak mass is below [Formula presented] at [Formula presented] and the total width is [Formula presented] at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.

UR - https://www.scopus.com/pages/publications/85038322265

U2 - 10.1103/PhysRevLett.91.022001

DO - 10.1103/PhysRevLett.91.022001

M3 - Article

AN - SCOPUS:85038322265

SN - 0031-9007

VL - 91

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

ER -

Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays

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