Measurement of the Decays B -> Dlv

Enrico Feltresi, Technische Universität Dortmund, Technische Universität Dortmund
2010
One of the main goals of the BABAR Experiment at the SLAC National Accelerator Laboratory's e + e − storage ring PEP-II is the precise measurement of the CKM-Matrix elements. Semileptonic B-decays allow the extraction of both |V cb | and |V ub | . This analysis presents an exclusive untagged measurement of the semileptonic decay B → D ν to extract |V cb | and the form factor slopeρ 2 . Results are presented based on a data sample of approximately 390 fb −1 , which corresponds to (383.6 ± 4.2) ×
more » ... to (383.6 ± 4.2) × 10 6 Υ (4S) → BB decays. The results are: where the rst uncertainties are statistical and the second systematic, G(1) is the hadronic form factor at the point of zero recoil. Integrating the dierential decay rate dΓ/dw over the allowed values of w, and using the previous results, the branching fraction B(B → D ν) has been determined: B(B → D ν) = (2.38 ± 0.03 ± 0.10)%. (0.3)
doi:10.17877/de290r-15672 fatcat:tfmqymkm2fc3zm275lp2qj6uoi