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

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.