Semileptonic B Decays at BABAR

TL;DR

This paper reports on semileptonic B decay measurements at BABAR, utilizing a novel full reconstruction technique and traditional methods to improve precision in testing the Standard Model and CKM matrix elements.

Contribution

It introduces a new measurement approach combining full B meson reconstruction with traditional analysis, enhancing the accuracy of semileptonic B decay studies.

Findings

Precise measurements of |Vcb| and |Vub| constrain CKM unitarity.

Validation of Heavy Quark Effective Theory parameters.

Complementary high-statistics data analysis techniques.

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.