摘要
利用在质心能量10.6GeV附近获取的500兆cc事例,在BaBar实验中对衰变D^0→π^-e^+ν进行了研究.利用这些数据,测量了D^0→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D^0→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.
The decay D^0→π^-e^+νis studied at the BaBar experiment using a sample of 500 million cc events recorded near the CM energy 10.6GeV.Using this data,the branching fraction of the process D^0→π^-e^+νis extracted,as well as the hadronic form factor fπ+,Dand the CKM matrix element Vcd.Applying a relation between the decays D^0→π^-e^+νand B0→π-e+ν,the matrix element V_(ub) is calculated and its precision will become competitive once new theoretical calculations appear.
出处
《中国科学技术大学学报》
CAS
CSCD
北大核心
2016年第5期369-373 382,382,共6页
JUSTC
基金
Supported by DOE and NSF(USA)
NSERC(Canada)
CEA and CNRS-IN2P3(France)
BMBF and DFG(Germany)
INFN(Italy)
FOM(The Netherlands)
NFR(Norway)
MES(Russia)
MICIIN(Spain)
STFC(United Kingdom)
Individuals have received support from the DFG(Germany)
