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利用北京谱仪 (BES)在北京正负电子对撞机 (BEPC)e+e- 对撞质心系能量为 4.0 3GeV处收集的积分亮度为 2 2 .3pb- 1的数据 ,测量了带电及中性D介子的单举半轻子 (电子 )衰变的分支比 .分析中采用了“联合D0 和D+单双标记”的方法 ,测得D- 和D0 单举半轻子 (电子 )衰变的分支比分别为BF(D- →e- X) =( 2 1 .8± 8.5± 4.2 ) % ,BF(D0 →e- X) =( 8.9± 3 .0± 1 .6) % ,其相对比值为BF(D- →e- X)BF(D0 →e- X) =2 .4± 1 .7± 0 .8.
Based on the data collected by Beijing spectrometer (BES) with an integral brightness of 22.2pb-1 collected at the Beijing Center for Electron-Positron Colliders (BEPC) e + e-colliding mass centers at 4.0 3GeV, Sex D sub-single half-lift (electron) decay branch ratio.The analysis using the “combination of D0 and D + single and double labeling” method, measured D-and D0 single lift half son (electron) decay branch (BF (D → e-X) = (21.8 ± 8.5 ± 4.2)%, BF (D0 → e-X) = (8.9 ± 3.0 ± 1.6)%, respectively. The relative ratio Is BF (D → e-X) BF (D0 → e-X) = 2. 4 ± 1 .7 ± 0 .8.