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Observation of B+ → ρ+K0 and measurement of its branching fraction and charge asymmetry
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We present the first observation of the decay B + → ρ + K 0 , using a data sample of 348 fb − 1 collected at the Υ ( 4 S ) resonance with the BABAR detector. The branching fraction and charge asymmetry are measured to be ( 8.0 + 1.4 − 1.3 ± 0.6 ) × 10 − 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 = ( Γ B − − Γ B + ) / ( Γ B − + Γ B + ) with Γ B ± the B ± decay rate. The significance of the observed branching fraction, including systematic uncertainties, is 7.9 standard deviations.
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GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Observation of B+ → ρ+K0 and measurement of its branching fraction and charge asymmetry. Physical Review D. 2007. Vol. 76, num. 1, pags. 011103(R). ISSN 1550-7998. [consulted: 3 of July of 2026]. Available at: https://hdl.handle.net/2445/131453