Determination of |V{sub ub}| in Inclusive Semileptonic B Meson Decays

Abstract

The authors present a preliminary determination of the CKM matrix element |V{sub ub}| based on the analysis of semileptonic B decays from a sample of 88 million {Upsilon}(4S) decays collected with the BaBar detector at the e{sup +}e{sup -} storage ring. Charmless semileptonic B decays are selected using the electron energy E-e and the invariant mass q{sup 2} of the electron-neutrino pair. The neutrino meomentum is inferred from a measurement of the visible energy and momentum in the detector and knowledge of the e{sup +}e{sup -} beam momenta. The partial branching fraction is determined in a region of the q{sup 2}-E-e plane where semileptonic B decays to charm are highly suppressed. The total charmless semileptonic branching fraction is extracted using a theoretical calculation based on the heavy quark expansion. Preliminary results yield |V{sub ub}| = (4.57 {+-} 0.21 {+-} 0.25 {+-} 0.34 + 0.59 - 0.29 {+-} 0.22) x 10{sup -3} where the uncertainties are from statistics (data and MC), detector modeling, background modeling, the shape function, and the heavy quark operator product expansion, respectively.

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