【摘要】 在正负电子对撞能量 4 0 3GeV处 ,BES实验在BEPC对撞机上完成了Ds 介子纯轻子衰变 ,半轻子衰变和φπ+ 分支比的绝对测量 .文章详细描述了用于π与K识别的联合置信度方法 ,Ds单标记和双标记技术 ,以及计算Ds 衰变分支比的最大似然函数 .对所得物理结果做了讨论和评述 .对未来Ds物理改进测量做了展望更多还原

【Abstract】 Absolute measurement of branching fractions of purely leptonic decay, semi leptonic decay and φπ + decay of the D s meson at a c. m. energy of 4.03 GeV were completed from the BES experiment at the BEPC electron positron collider. The method by using combined confidence level for pion and kaon separation, the D s single and double tagging technology, and the maximum likelihood functions in the estimate of the D s branching fractions are described in details. Discussion and comments on these physics results are made. Prospect for improved measurement of D s physics in future is also given.更多还原