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Observation of B+ -> rho+ K-(0) and measurement of its branching fraction and charge asymmetry

AuthorsAubert, B.; Garra Tico, J.; Grauges, E.; Azzolini, Virginia; López-March, Neus ; Martínez-Vidal, Fernando ; Milanés, Diego A. ; Oyanguren, Arantza ; Babar Collaboration
B mesons
C invariance
Meson hadronic decay
Standard model
Issue DateJul-2007
PublisherAmerican Physical Society
CitationPhysical Review D 76(1): 011103 (2007)
AbstractWe present the first observation of the decay B+ -> rho+ K-(0), using a data sample of 348 fb(-1) collected at the Upsilon(4S) resonance with the BABAR detector. The branching fraction and charge asymmetry are measured to be (8.0(-1.3)(+1.4) ± 0.6)x10(-6) and (-12.2 ± 16.6 ± 2.0)%, respectively, where the first uncertainty is statistical and the second is systematic. The charge asymmetry is defined by A(ch)=(Gamma(-)(B)-Gamma(+)(B))/(Gamma(-)(B)+Gamma(+)(B)) with Gamma(±)(B) the B-± decay rate. The significance of the observed branching fraction, including systematic uncertainties, is 7.9 standard deviations.
Description8 pages, 1 figure.-- PACS nrs.: 13.25.Hw; 11.30.Er; 12.15.Hh.-- ISI Article Identifier: 000248544300003.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ex/0702043.-- et al. (BABAR Collaboration).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.76.011103
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