Measurements of the cross sections for e+e−→hadrons at 3.650, 3.6648, 3.773 GeV and the branching fraction for ψ(3770)→non-DD

Measurements of the cross sections for e+e−→hadrons at 3.650, 3.6648, 3.773 GeV and the branching fraction for ψ(3770)→non-DD

Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the R values (R=σe+e−→hadrons0/σe+e−→μ+μ−0) for inclusive hadronic event production at the center-of-mass energies of 3.650, 3.6648 and 3.773 GeV. The results lead to R¯uds=2.218±0.019±0.089 which is the...

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Veröffentlicht in:Physics letters. B 2006-10, Vol.641 (2), p.145-155
Hauptverfasser: Bai, J.Z., Chen, H.X., Chen, J.C., Chi, S.P., Chu, Y.P., Dai, Y.S., Deng, Z.Y., Dong, L.Y., Du, S.X., Fang, S.S., Fu, C.D., Gao, C.S., Gao, Y.N., Gu, S.D., Gu, Y.T., Guo, Y.Q., He, M., Heng, Y.K., Hu, H.M., Huang, X.T., Jin, D.P., Jin, S., Jin, Yi, Lai, Y.F., Li, G., Li, H.B., Li, H.H., Li, J., Li, S.M., Li, W.D., Li, Y.L., Liang, Y.F., Liu, F., Liu, Fang, Liu, J.B., Liu, J.P., Liu, R.G., Lu, G.R., Lu, J.G., Luo, C.L., Ma, F.C., Ma, L.L., Ma, Q.M., Ma, X.B., Mao, Z.P., Nie, J., Qi, N.D., Qin, H., Qiu, J.F., Rong, G., Shang, L., Shen, D.L., Shen, X.Y., Sheng, H.Y., Shi, F., Sun, H.S., Sun, S.S., Sun, Z.J., Tan, Z.Q., Tang, X., Tian, Y.R., Tong, G.L., Wang, L.S., Wang, M., Wang, P., Wang, P.L., Wang, W.F., Wang, Y.F., Wang, Z., Wang, Zhe, Wei, D.H., Wu, N., Xie, X.X., Yan, M.L., Yang, H.X., Yang, J., Yang, Y.X., Ye, M.H., Ye, Y.X., Yuan, C.Z., Yuan, Y., Zeng, Y., Zeng, Yu, Zhang, B.Y., Zhang, D.H., Zhang, J.W., Zhang, J.Y., Zhang, Q.J., Zhang, X.M., Zhang, X.Y., Zhang, Yiyun, Zhang, Z.P., Zhao, M.G., Zhao, P.P., Zheng, H.Q., Zhu, Q.M., Zhu, Y.S., Zhu, Z.A., Zhuang, B.A., Zhuang, X.A.
Format: Artikel
Sprache:eng
Schlagworte:
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
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Zusammenfassung:Using the BES-II detector at the BEPC Collider, we measured the lowest order cross sections and the R values (R=σe+e−→hadrons0/σe+e−→μ+μ−0) for inclusive hadronic event production at the center-of-mass energies of 3.650, 3.6648 and 3.773 GeV. The results lead to R¯uds=2.218±0.019±0.089 which is the average of these measured at 3.650 GeV and 3.6648 GeV, and R=3.746±0.037±0.187 at s=3.773 GeV. We determined the lowest order cross section for ψ(3770) production to be σψ(3770)B=(9.323±0.253±0.801) nb at 3.773 GeV, the branching fractions for ψ(3770) decays to be BF(ψ(3770)→D0D¯0)=(49.5±1.3±3.8)%, BF(ψ(3770)→D+D−)=(35.7±1.1±3.4)% and BF(ψ(3770)→DD¯)=(85.5±1.7±5.8)%, which result in the total non-DD¯ branching fraction of ψ(3770) decay to be BF(ψ(3770)→non-DD¯)=(14.5±1.7±5.8)%.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2006.08.049