SEMILEPTONIC B-DECAYS AT BABAR

Abstract

We present results on semileptonic B-decays obtained with the BABAR detector. The large data set accumulated at the PEP-II asymmetric-energy B-factory allows a new measurement technique, where the hadronic decay of one B-meson is fully reconstructed and the semileptonic decay of the recoiling B-meson is studied. Traditional analysis techniques of inclusive and exclusive B-decays complement this approach with very high statistics data samples. These measurements play an important role in the tests of the description of CP violation in the Standard Model: The determinations of the Cabibbo-Kobayashi-Maskawa matrix elements |Vcb| and |Vub| provide constraints on the unitarity of the CKM triangle. Furthermore, the experimental measurement of parameters of Heavy Quark Effective Theory test the consistency of the theoretical description of semileptonic B-decays.