Measurement of the branching fractions and CP asymmetries of B⁺ → π⁺ π⁰ and B⁺ → K⁺ π⁰ decays in 2019-2021 Belle II data

2022/09/12 by Belle II Collaboration, F. Abudinén, I. Adachi +679
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.2209.05154

openalex publication_date 2022/09/12 · openalex created_date 2022/09/14 · openalex updated_date 2026/07/28

Abstract

We determine the branching fractions B and CP asymmetries A_{\it CP} of the decays B⁺ → π⁺ π⁰ and B⁺ → K⁺ π⁰. The results are based on a data set containing 198 million bottom-antibottom meson pairs corresponding to an integrated luminosity of 190 fb^-1 recorded by the Belle II detector in energy-asymmetric electron-positron collisions at the Υ(4S) resonance. We measure B(B⁺ → π⁺ π⁰) = (6.12 ± 0.53 ± 0.53)× 10^-6, B(B⁺ → K⁺ π⁰) = (14.30 ± 0.69 ± 0.79)× 10^-6, A_{\it CP}(B⁺ → π⁺ π⁰) = -0.085 ± 0.085 ± 0.019, and A_{\it CP}(B⁺ → K⁺ π⁰) = 0.014 ± 0.047 ± 0.010, where the first uncertainties are statistical and the second are systematic. These results improve a previous Belle II measurement and agree with the world averages.

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