Measurement of the branching fractions and $CP$ asymmetries of $B^+ rightarrow π^+ π^0$ and $B^+ rightarrow K^+ π^0$ decays in 2019-2021 Belle II data

Kavli Affiliate: T. Higuchi

| First 5 Authors: Belle II Collaboration, F. Abudinén, I. Adachi, K. Adamczyk, L. Aggarwal

| Summary:

We determine the branching fractions ${mathcal{B}}$ and $CP$ asymmetries
${mathcal{A}_{{it CP}}}$ of the decays $B^+ rightarrow pi^+ pi^0$ and $B^+
rightarrow K^+ pi^0$. The results are based on a data set containing 198
million bottom-antibottom meson pairs corresponding to an integrated luminosity
of $190;text{fb}^{-1}$ recorded by the Belle II detector in energy-asymmetric
electron-positron collisions at the $Upsilon (4S)$ resonance. We measure
${mathcal{B}(B^+ rightarrow pi^+ pi^0) = (6.12 pm 0.53 pm 0.53)times
10^{-6}}$, ${mathcal{B}(B^+ rightarrow K^+ pi^0) = (14.30 pm 0.69 pm
0.79)times 10^{-6}}$, ${mathcal{A}_{{it CP}}(B^+ rightarrow pi^+ pi^0) =
-0.085 pm 0.085 pm 0.019}$, and ${mathcal{A}_{{it CP}}(B^+ rightarrow K^+
pi^0) = 0.014 pm 0.047 pm 0.010}$, 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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