D^0→π^-e^+ν分支比,形状因子和V_(ub)的测量（英文）  

Measurement of the D^0→π^-e^+ν branchingfraction,form factor and implications for V_(ub)

作　　者：GRIESSINGER K. 

机构地区：[1]美因茨大学原子物理研究所,德国美因茨55128

出　　处：《中国科学技术大学学报》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)

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.

关 键 词：BABAR D0 分支比 形状因子 VCD Vub 

分 类 号：O572.2[理学—粒子物理与原子核物理]