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Measurements of B ->{pi,eta,eta '}l nu(l) branching fractions and determination of vertical bar V-ub vertical bar with semileptonically tagged B mesons

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BaBar Collaboration (Including:

Aubert, B., Bona, M., Karyotakis, Y., Lees, J. P., Poireau, V., Prencipe, E., Prudent, X., Tisserand, V., Tico, J. Garra, Grauges, E. et al.
). (2008) Measurements of B ->{pi,eta,eta '}l nu(l) branching fractions and determination of vertical bar V-ub vertical bar with semileptonically tagged B mesons. Physical Review Letters, Vol.101 (No.8). article no. 081801. doi:10.1103/PhysRevLett.101.081801

Research output not available from this repository, contact author.
Official URL: http://dx.doi.org/10.1103/PhysRevLett.101.081801

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Abstract

We report measurements of branching fractions for the decays B -> Pl nu(l), where P are the pseudoscalar charmless mesons pi(-), pi(0), eta and eta('), based on 348 fb(-1) of data collected with the BABAR detector, using B-0 and B+ mesons found in the recoil of a second B meson decaying as B -> D-(*())l nu(l). Assuming isospin symmetry, we combine pionic branching fractions to obtain B(B-0 -> pi(-)l(+)nu(l)) = (1.54 +/- 0.17((stat)) +/- 0.09((syst))) x 10(-4); we find 3.2 sigma evidence of the decay B+ -> eta l(+)nu(l) and measure its branching fraction to be (0.64 +/- 0.20((stat))+/- 0.03((syst)))x10(-4), and determine B(B+ -> eta'l(+)nu(l)) < 0.47 x 10(-4) to 90% confidence level. Using partial branching fractions for the pionic decays in ranges of the momentum transfer and a variety of form factor calculation, we obtain values of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar in ranging from 3.6 x 10(-3) to 4.1 x 10(-3).

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: 22 August 2008
Dates:
DateEvent
22 August 2008UNSPECIFIED
Volume: Vol.101
Number: No.8
Number of Pages: 7
Page Range: article no. 081801
DOI: 10.1103/PhysRevLett.101.081801
Status: Peer Reviewed
Publication Status: Published
Funder: SLAC, DOE, NSF (USA), NSERC (Canada), CEA, CNRS-IN2P3 (France), BMBF, DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), Marie Curie EIF (European Union), A. P. Sloan Foundation

Data sourced from Thomson Reuters' Web of Knowledge

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