Speaker
Wolfgang Dungel
(Austrian Academy of Sciences)
Description
We present measurements of the branching fraction and the HQET form factors rho^2, R_1 and R_2 for the decay B0 -> D*-l^+ nu using untagged Upsilon(4S) -> B anti-B events. The Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}| is extracted and a test of the form factor parametrization is presented. The results are based on a large data sample recorded by the Belle detector at the KEKB e+ e- collider.
The measurement of the decay B+ -> anti-D*0 l nu does not rely on charged slow pion reconstruction, and thus allows us to cross-check measurements of B0 -> D*- l+ nu. We also present measurements of the branching fraction and of the HQET form factors rho^2, R_1 and R_2 obtained with this decay.
Author
Karim Trabelsi
(KEK)
