D0→π-e+ν分支比，形状因子和Vub的测量

Measurement of the D0→π-e+ν branching fraction, form factor and implications for Vub

摘要: 利用在质心能量106 GeV附近获取的500兆c事例，在BaBar实验中对衰变D0→π-e+ν进行了研究.利用这些数据，测量了D0→π-e+ν的分支比，同时测量了强子形状因子fπ+,D和CKM矩阵元Vcd.应用衰变D0→π-e+ν和B0→π-e+ν之间的关系，计算了矩阵元Vub，一旦出现新的理论计算,其精度将可以和其他实验测量相媲美.

Abstract: The decay D0→π-e+ν is studied at the BaBar experiment using a sample of 500 million c events recorded near the CM energy 106 GeV. Using this data, the branching fraction of the process D0→π-e+ν is extracted, as well as the hadronic form factor fπ+,D and the CKM matrix element Vcd. Applying a relation between the decays D0→π-e+ν and B0→π-e+ν, the matrix element Vub is calculated and its precision will become competitive once new theoretical calculations appear.