Measurements of branching fractions and direct \it CP-violating asymmetries in B⁺ → K⁺ π⁰~and~π⁺ π⁰ decays using 2019 and 2020 Belle II data

2021/05/10 by Abudinén, F., Adachi, I., Adak, R. +549
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2105.04111

Abstract

We report measurements of branching fractions (\mathcal B) and direct \it CP-violating asymmetries (\mathcal A_{\it CP}) for the decays B⁺→ K⁺π⁰ and B⁺ → π⁺π⁰ reconstructed with the Belle II detector in a sample of asymmetric-energy electron-positron collisions at the Υ(4S) resonance corresponding to 62.8 fb^-1 of integrated luminosity. The results are B(B⁺ → K⁺π⁰) = [11.9 ^+1.1_-1.0 (\rm stat)± 1.6(\rm syst)]× 10^-6, B(B⁺ → π⁺π⁰) = [5.5 ^+1.0_-0.9 (\rm stat)± 0.7(\rm syst)]× 10^-6, \mathcal A_{\it CP}(B⁺ → K⁺π⁰) = -0.09 ± 0.09 (\rm stat)± 0.03(\rm syst), and \mathcal A_{\it CP}(B⁺ → π⁺π⁰) = -0.04 ± 0.17 (\rm stat)± 0.06(\rm syst). The results are consistent with previous measurements and show a detector performance comparable with early Belle performance.

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