Measurements of Partial Branching Fractions for Bbar --> X_u ell nubar and Determination of |V_{ub}|

Details Measurements of Partial Branching Fractions for Bbar --> X_u ell nubar and Determination of |V_{ub}| Measurements of Partial Branching Fractions for Bbar --> X_u ell nubar and Determination of |V_{ub}|

2007-08-28

arxiv.org/abs/0708.3702v2

Phys.Rev.Lett.100:171802,2008

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 postscript figures, accepted by PRL; this version contains changes requested by PRL referees, as well as a small bu

Scientific paper

10.1103/PhysRevLett.100.171802

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_{syst.} +- 0.01_{theo.}) x 10^{-3} (M_X < 1.55 GeV/c^2), Delta B = (0.95 +- 0.10_{stat.} +- 0.08_{syst.} +- 0.01_{theo.}) x 10^{-3} (P_+ < 0.66 GeV/c), and Delta B = (0.81 +- 0.08_{stat.} +- 0.07_{syst.} +- 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.

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