Abstract
We report on measurements of branching fractions (B) and direct CP asymmetries (ACP) for the decays, B+ → K+ π0, π+ π0 with a sample collected in 2019 and 2020 at the Υ(4S) resonance, corresponding to 62.8 fb^-1 of integrated luminosity. In this study, we use two dimensional Mbc X ΔE fitting to determine the signal yields. We obtain the following branching fractions B(B+ → K+ π0) = [11.9 +1.1 -1.0 (stat) ± 1.6(syst)] X 10-6 and B(B+ → π+ π0) = [5.5 +1.0 -0.9 (stat) ± 0.7(syst)] X 10^-6. The direct CP asymmetries are measured to be ACP(B+ → K+ π0) = -0.089 ± 0.085 (stat) ± 0.025(syst) and ACP(B+ → π+ π0) = -0.042 ± 0.166 (stat) ± 0.062(syst), where the first uncertainty is statistical uncertainty an the second is the systematic uncertainty. The results agree with world average and show a good detector performance in early stage.
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