ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 95, p. -
Determination of from measurements of the electron and neutrino momenta in inclusive semileptonic B decays
We present a determination of the Cabibbo-Kobayashi-Maskawa matrix element based on the analysis of semileptonic B decays from a sample of 88×106 Υ(4S) decays collected with the BABAR detector at the SLAC 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 =(3.95±0.26-0.42+0.58±0.25)×10-3, where the errors represent experimental uncertainties, heavy quark parameter uncertainties, and theoretical uncertainties, respectively. © 2005 The American Physical Society.