Partial wave analyses of J/ψ→γπ+π− and γπ0π0

• Published in: Physics letters. B Vol. 642; no. 5-6; pp. 441 - 448
• Main Authors: Bai, J.Z., Chen, H.X., Chen, J.C., Chi, S.P., Chu, Y.P., Dai, Y.S., Diao, L.Y., Deng, Z.Y., Du, S.X., Fu, C.D., Gao, C.S., Gao, Y.N., Guo, Y.Q., He, K.L., He, M., Heng, Y.K., Hu, H.M., Huang, G.S., Huang, X.T., Ji, X.B., Jiang, X.Y., Jiao, J.B., Jin, Yi, Li, H.H., Li, R.Y., Li, S.M., Li, X.L., Li, X.N., Li, X.Q., Liang, Y.F., Liu, B.J., Liu, C.X., Liu, F., Liu, Fang, Liu, H.H., Liu, H.M., Liu, J., Liu, J.B., Liu, R.G., Liu, Z.A., Lu, G.R., Lu, J.G., Ma, F.C., Ma, H.L., Ma, L.L., Mo, X.H., Nie, J., Olsen, S.L., Ping, R.G., Qiu, J.F., Ren, Z.Y., Rong, G., Shan, L.Y., Shen, C.P., Shen, D.L., Shen, X.Y., Sun, H.S., Sun, Z.J., Varner, G.S., Wang, D.Y., Wang, L.L., Wang, L.S., Wang, M., Wang, P., Wang, W.F., Wang, Y.F., Wang, Z., Wang, Z.Y., Wang, Zheng, Wei, D.H., Wu, N., Xia, X.M., Xie, X.X., Xu, X.P., Ye, M.H., Ye, Y.X., Yu, G.W., Yuan, J.M., Yuan, Y., Zang, S.L., Zeng, Y., Zhang, B.X., Zhang, C.C., Zhang, H.Q., Zhang, J.Y., Zhang, X.M., Zhang, X.Y., Zhang, Yiyun, Zhao, J.W., Zhao, M.G., Zhao, W.R., Zheng, H.Q., Zhou, L., Zhou, N.F., Zhu, K.J., Zhu, Q.M., Zhu, Y.S., Zhu, Yingchun, Zhuang, B.A., Zou, B.S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 23-11-2006; Elsevier Science
• Subjects: Exact sciences and technology; Nuclear physics; Physics; The physics of elementary particles and fields; 12.39.Mk; 14.40.Cs; 13.25.Gv; Branching ratio; Radiative decay; GeV range; Tensor method
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2006.10.004

Results are presented on J/ψ radiative decays to π+π− and π0π0 based on a sample of 58M J/ψ events taken with the BES II detector. Partial wave analyses are carried out using the relativistic covariant tensor amplitude method in the 1.0 to 2.3GeV/c2ππ mass range. There are conspicuous peaks due to the f2(1270) and two 0++ states in the 1.45 and 1.75 GeV/c2 mass regions. The first 0++ state has a mass of 1466±6±20MeV/c2, a width of 108−11+14±25MeV/c2, and a branching fraction B(J/ψ→γf0(1500)→γπ+π−)=(0.67±0.02±0.30)×10−4. Spin 0 is strongly preferred over spin 2. The second 0++ state peaks at 1765−3+4±13MeV/c2 with a width of 145±8±69MeV/c2. If this 0++ is interpreted as coming from f0(1710), the ratio of its branching fractions to ππ and KK¯ is 0.41−0.17+0.11.