Analysis of BaBar, Belle, BES-II, CLEO and KEDR data on ψ (3770) line shape and determination of the resonance parameters
A.G. Shamov (Novosibirsk State University, Novosibirsk, 630090, Russia, Budker Institute of Nuclear Physics, Siberian Div., Russian Acad. Sci., Novosibirsk, 630090, Russia); K.Yu. Todyshev (Novosibirsk State University, Novosibirsk, 630090, Russia, Budker Institute of Nuclear Physics, Siberian Div., Russian Acad. Sci., Novosibirsk, 630090, Russia)
The available data on the DDâ¾ and inclusive hadronic cross sections in the Ï(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 Ï(3770) line shape were considered for the DDâ¾ channel. All of them gave satisfactory description of the data. The combined analysis of the DDâ¾ and inclusive hadronic channels was performed using the model based on the vector dominance approach and accounting for the contribution of the Ï(2S) tail to the DDâ¾ cross section. The following values of the mass, total width, electron width and decay probability to the non- DDâ¾ states were obtained: M (MeV)Π(MeV)Îee (eV)BnDDâ¾3779.8±0.625.8±1.3196±180.164±0.049 where the errors quoted include both statistical and dominant systematic uncertainties.
