Measurements of Branching Fractions and Direct CP Asymmetries in pi⁺ pi⁰, K⁺ pi⁰ and K⁰ pi⁰ B Decays

2002/07/24 by B. Aubert, Aubert, B.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ex/0207065

openalex publication_date 2002/07/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present preliminary results of the analyses of B⁺ --> h⁺ pi⁰ (with h⁺ = pi⁺, K⁺) and B⁰ --> K⁰ pi⁰ decays from a sample of approximately 88 million B barB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the pi⁺ pi⁰ branching fraction and we obtain B(B⁺ --> pi⁺ pi⁰) = (5.5^+1.0_-0.9 +/- 0.6) times 10^-6 with a significance of 7.7 sigma including systematic uncertainties. We measure the K⁺ pi⁰ and K⁰ pi⁰ branching fractions to be B(B⁺ --> K⁺ pi⁰) = (12.8^+1.2_-1.1 +/- 1.0) times 10^-6 and B(B⁰ --> K⁰ pi⁰) = (10.4 +/- 1.5 +/- 0.8) times 10^-6. At the same time, the direct CP-violating asymmetries are investigated and we find A_{pi⁺ pi⁰} = -0.03_-0.17^+0.18 +/- 0.02, A_{K⁺ pi⁰} = -0.09 +/- 0.09 +/- 0.01 and A_{K⁰ pi⁰} = 0.03 +/- 0.36 +/- 0.09, where the errors are statistical and systematic, respectively.

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