Analysis of BaBar, Belle, BES-II, CLEO and KEDR data on psi(3770) line shape and determination of the resonance parameters

作者：Shamov A G; Todyshev K Yu^*

来源：Physics Letters B, 2017, 769: 187-190.

DOI：10.1016/j.physletb.2017.03.057

The available data on the D<(D)over bar and inclusive hadronic cross sections in the psi(3770) region from the BaBar, Belle, BES-II, CLEO and KEDR experiments have been analyzed assuming that systematic uncertainties on cross sections measured by various detectors are not correlated. Four theoretical models predicting the psi(3770) line shape were considered for the D<(D)over bar> channel. All of them gave satisfactory description of the data. The combined analysis of the D (D) over bar and inclusive hadronic channels was performed using the model based on the vector dominance approach and accounting for the contribution of the psi(2S) tail to the D (D) over bar cross section. The following values of the mass, total width, electron width and decay probability to the non-D (D) over bar states were obtained:
M (MeV) Gamma (MeV) Gamma(ee) (eV) B-nD (D) over bar
3779.8 +/- 0.6 25.8 +/- 1.3 196 +/- 18 0.164 +/- 0.049
where the errors quoted include both statistical and dominant systematic uncertainties.

• 出版日期2017-6-10