Determination of |Vub| from Measurements of the Electron and Neutrino Momenta in Inclusive Semileptonic B Decays

Abstract

We present a determination of the CKM matrix element |Vub| based on the analysis of semileptonic B decays from a sample of 88 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II e+e- storage ring. Charmless semileptonic B decays are selected using measurements of the electron energy and the invariant mass squared of the electron-neutrino pair. We obtain |Vub| = (3.95 +/- 0.26 ^{+0.58}_{-0.42} +/- 0.25) x 10^{-3}, where the errors represent experimental uncertainties, heavy quark parameter uncertainties, and theoretical uncertainties, respectively.

7 pages, 2 figures. This version contains updated values for the efficiencies, partial branching fractions and |Vub| that result from correcting an error in the calculation of the efficiency. None of the yields measured in the analysis have changed. An erratum to Phys. Rev. Lett. 95, 111801 (2005) with the updated numbers will appear soon