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Measurements of partial branching fractions for (B)over-bar -> X(u)l(nu)over-bar and determination of vertical bar V-ub vertical bar

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Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Tico, J. Garra et al.
(2008) Measurements of partial branching fractions for (B)over-bar -> X(u)l(nu)over-bar and determination of vertical bar V-ub vertical bar. Physical Review Letters, Vol.100 (No.17). doi:10.1103/PhysRevLett.100.171802

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.100.171802

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Abstract

We present partial branching fractions for inclusive charmless semileptonic B decays (B) over bar -> X(u)l (nu) over bar, and the determination of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar. The analysis is based on a sample of 383 x 10(6) gamma(4S) decays into B (B) over bar pairs collected with the BABAR detector at the SLAC PEP-II e(+)e(-) storage rings. We select events using 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(theor)) x 10(-3) (M-X < 1.55 GeV/c(2)), Delta B = (0.95 +/- 0.10(stat) +/- 0.08(syst) +/- 0.01(theor)) x 10(-3) (P+ < 0.66 GeV/c), and Delta B = (0.81 +/- 0.08(stat) +/- 0.07(syst) +/- 0.02(theor)) x 10(-3) (M-X < 1.7 GeV/c(2), q(2) > 8 GeV2/c(4)). Corresponding values of vertical bar V-ub vertical bar are extracted using several theoretical calculations.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 2 May 2008
Dates:
DateEvent
2 May 2008Published
Volume: Vol.100
Number: No.17
Number of Pages: 7
DOI: 10.1103/PhysRevLett.100.171802
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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