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Aubert, B.; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Garra Tico, J.; Grauges, E.; Lopez, L.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Sun, L.; S. Abrams, G.; Battaglia, M.; N. Brown, D.; Button-Shafer, J.; N. Cahn, R.; Groysman, Y.; G. Jacobsen, R.; A. Kadyk, J.; T. Kerth, L.; G. Kolomensky, Yu; Kukartsev, G.; Lopes Pegna, D.; Lynch, G.; M. Mir, L.; J. Orimoto, T.; L. Osipenkov, I.; T. Ronan, M.; Tackmann, K.; Tanabe, T.; Wenzel, W.A.; del Amo Sanchez, P.; M. Hawkes, C.; T. Watson, A.; Koch, H.; Schroeder, T.; Walker, D.; J. Asgeirsson, D.; Cuhadar-Donszelmann, T.; G. Fulsom, B.; Hearty, C.; S. Mattison, T.; A. Mckenna, J.; Barrett, M.; Khan, A.; Saleem, M.; Teodorescu, L.; E. Blinov, V.; D. Bukin, A.; P. Druzhinin, V.; B. Golubev, V.; P. Onuchin, A.; I. Serednyakov, S.; I. Skovpen, Yu; P. Solodov, E.; Yu. Todyshev, K.; Bondioli, M.; Curry, S.; Eschrich, I.; Kirkby, D.; J. Lankford, A.; Lund, P.; Mandelkern, M.; C. Martin, E.; P. Stoker, D.; Abachi, S.; Buchanan, C.; D. Foulkes, S.; W. Gary, J.; Liu, F.; Long, O.; C. Shen, B.; M. Vitug, G.; Zhang, L.; P. Paar, H.; Rahatlou, S.; Sharma, V.; W. Berryhill, J.; Campagnari, C.; Cunha, A.; Dahmes, B.; M. Hong, T.; Kovalskyi, D.; D. Richman, J.; W. Beck, T.; M. Eisner, A.; J. Flacco, C.; Heusch, C.A.; Kroseberg, J.; S. Lockman, W.; Schalk, T.; A. Schumm, B.; Seiden, A.; G. Wilson, M.
Physical review letters, 2008, Letnik: 100Journal Article
We present partial branching fractions for inclusive charmless semileptonic B decays Bbar --> X_u ell nubar, and the determination of the CKM matrix element |V_{ub}|. The analysis is based on a sample of 383 million Y(4S) decays into B Bbar pairs collected with the BaBar detector at the PEP-II e+ e- storage rings. We select events using either the invariant mass M_X of the hadronic system, the invariant mass squared, q^2, of the lepton and neutrino pair, the kinematic variable P_+ or one of their combinations. We then determine partial branching fractions in limited regions of phase space: Delta B = (1.18 +- 0.09_{stat.} +- 0.07_{sys.} +- 0.01_{theo.}) x 10^{-3} (M_X < 1.55 GeV/c^2), Delta B = (0.95 +- 0.10_{stat.} +- 0.08_{sys.} +- 0.01_{theo.}) x 10^{-3} (P_+ < 0.66 GeV/c), and Delta B = (0.76 +- 0.08_{stat.} +- 0.07_{sys.} +- 0.02_{theo.}) x 10^{-3} (M_X < 1.7 GeV/c^2, q^2 > 8 GeV^2/c^4). Corresponding values of |V_{ub}| are extracted using several theoretical calculations.
