Observation of $B^{+}\to {\rho }^{+}{K}^0$ and Measurement of its Branching Fraction and Charge Asymmetry

Abstract

We present the first observation of the decay $B^{+}\to {\rho }^{+}{K}^0$, using a data sample of 348 fb${}^{-1}$ collected at the ${\rm Y}(4S)$ resonance with the \babar detector.The branching fraction and charge asymmetry are measured to be $(8.0_{-1.3}^{+1.4}\pm 0.6)\times 10^{-6}$ and ($-12.2\pm 16.6\pm 2.0)$, respectively, where the first uncertainty is statistical and the second is systematic. The significance of the observed branching fraction, including systematic uncertainties, is 7.9 standard deviations.

7 pages, 1 figure, Physical Review D 76, 011103 (R), 2007

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