Determination of the bquark mass and nonperturbative parameters in semileptonic and radiat.pdf

SLAC-PUB-13036 Determination of the b-quark mass and nonperturbative parameters in semileptonic and radiative penguin decays at BABAR Kerstin Tackmann (on behalf of the BABAR collaboration) Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720 8 0 Abstract 0 2 Knowing the mass of the b-quark is essential to the study of the structure and decays of B mesons n as well as to future tests of the Higgs mechanism of mass generation. We present recent prelimi- a nary measurements of the b-quark mass and related nonperturbative parameters from moments of J kinematic distributions in charmed and charmless semileptonic and radiative penguin B decays. 3 2 Their determination from charmless semileptonic B decays is the first measurement in this mode. The data were collected by the BABAR detector at the PEP-II asymmetric-energy e+e−–collider at ] x the Stanford Linear Accelerator Center at a center-of-momentum energy of 10.58 GeV. e - p e h [ 2 v 5 8 9 2 . 1 0 8 0 : v i X r a 1 1. INTRODUCTION An important goal of the B-physics program is the precise measurement of the CKM matrix [1] elements |Vcb | and |Vub |. The most accurate determinations are obtained from semileptonic decays B → X ℓν and B → X ℓν , respectively. Generally, two different c u approaches can be used: The hadronic state Xc,u can be reconstructed either in specific exclusive modes, or inclusivel