Measurement of the B+- --> rho+- pi0 Branching Fraction and Direct CP Asymmetry

Details Measurement of the B+- --> rho+- pi0 Branching Fraction and Direct CP Asymmetry Measurement of the B+- --> rho+- pi0 Branching Fraction and Direct CP Asymmetry

2005-06-27

arxiv.org/abs/hep-ex/0506069v1

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 5 postscript figures, contributed to Lepton-Photon 2005

Scientific paper

An improved measurement of the process B+- --> rho+- pi0 is presented. The data sample of 211/fb comprises 232 million Y(4S) --> BBbar decays collected with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. The yield and CP asymmetry are calculated using an extended maximum likelihood fitting method. The branching fraction and asymmetry are found to be BR(B+- --> rho+- pi0) = [10.0 +- 1.4 (stat) +- 0.9 (syst)]x 10^-6 and Acp(B+- --> rho+- pi0) = -0.01 +- 0.13 (stat) +- 0.02 (syst), superseding previous measurements. The statistical significance of the branching fraction is calculated to be 8.7sigma.

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