分析BaBar、Belle、PDKEEPAAAAB、CLEO和KEDR数据对$ψ(3770)$线形的影响并确定共振参数
Analysis of BaBar, Belle, BES-II, CLEO and KEDR data on $ψ(3770)$ line shape and determination of the resonance parameters
摘要：
假设不同探测器测量的截面的系统不确定性是不相关的，对BaBar，Belle，BES-Ⅱ，CLEO和KEDR实验中的$D\overline{D}$和包含在$ψ(3770)$区域的强子截面的现有数据进行了分析。对于$D\overline{D}$通道，考虑了预测$ψ(3770)$线形的四种理论模型。所有这些都对数据进行了令人满意的描述。利用矢量占优方法建立的模型，考虑了$ψ(2S)$尾对$D\overline{D}$截面的贡献，对$D\overline{D}$和包含的强子通道进行了联合分析.获得了以下质量、总宽度、电子宽度和衰变到非$D\overline{D}$态的概率值：$M=3779.8 \pm 0.6 ~\text{MeV}, Γ=25.8 \pm 1.3 ~\text{MeV} , Γ_{ee}=196 \pm 18 ~\text{eV}, \mathcal{B}_{nD\overline{D}}=0.164 \pm 0.049$，其中引用的误差包括统计和主要的系统不确定性。
英文摘要：
The available data on the $D\overline{D}$ and inclusive hadronic cross sections in the $ψ(3770)$ region from the BaBar, Belle, BES-II, CLEO and KEDR experiments have been analyzed assuming that systematic uncertainties on cross sections measured by different detectors are not correlated. Four theoretical models predicting the $ψ(3770)$ line shape were considered for the $D\overline{D}$ channel. All of them gave satisfactory description of the data. The combined analysis of the $D\overline{D}$ and inclusive hadronic channel was performed using the model based on the vector dominance approach and accounting for the contribution of the $ψ(2S)$ tail to the $D\overline{D}$ cross section. The following values of the mass, total width, electron width and decay probability to the non-$D\overline{D}$ states were obtained: $M=3779.8 \pm 0.6 ~\text{MeV}, Γ=25.8 \pm 1.3 ~\text{MeV} , Γ_{ee}=196 \pm 18 ~\text{eV}, \mathcal{B}_{nD\overline{D}}=0.164 \pm 0.049$, where the errors quoted include both statistical and dominant systematic uncertainties.
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