BaBar Collaborat (Including:

). (2006) Measurement of the B ->pi l nu branching fraction and determination of vertical bar V-ub vertical bar with tagged B mesons. PHYSICAL REVIEW LETTERS, 97 (21). -. doi:10.1103/PhysRevLett.97.211801 ISSN 0031-9007.

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Abstract

We report a measurement of the B ->pi center dot nu branching fraction based on 211 fb(-1) of data collected with the BABAR detector. We use samples of B-0 and B+ mesons tagged by a second B meson reconstructed in a semileptonic or hadronic decay and combine the results assuming isospin symmetry to obtain B(B-0 ->pi(-)center dot(+)nu)=(1.33 +/- 0.17(stat)+/- 0.11(syst))x10(-4). We determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar by combining the partial branching fractions measured in ranges of the momentum transfer squared and theoretical calculations of the form factor. Using a recent lattice QCD calculation, we find vertical bar V-ub vertical bar=(4.5 +/- 0.5(stat)+/- 0.3(syst)0.7/0.5(FF))x10(-3), where the last error is due to the normalization of the form factor.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW LETTERS
Publisher:	AMERICAN PHYSICAL SOC
ISSN:	0031-9007
Official Date:	24 November 2006
Dates:	Date Event 24 November 2006 UNSPECIFIED
Volume:	97
Number:	21
Number of Pages:	7
Page Range:	-
DOI:	10.1103/PhysRevLett.97.211801
Publication Status:	Published

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