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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 198million bottom-antibottom meson pairs corresponding to an integrated luminosityof $190\;\text{fb}^{-1}$ recorded by the Belle II detector in energy-asymmetricelectron-positron collisions at the $\Upsilon (4S)$ resonance. We measure${\mathcal{B}(B^+ \rightarrow \pi^+ \pi^0) = (6.12 \pm 0.53 \pm 0.53)\times10^{-6}}$, ${\mathcal{B}(B^+ \rightarrow K^+ \pi^0) = (14.30 \pm 0.69 \pm0.79)\times 10^{-6}}$, ${\mathcal{A}_{{\it CP}}(B^+ \rightarrow \pi^+ \pi^0) =-0.085 \pm 0.085 \pm 0.019}$, and ${\mathcal{A}_{{\it CP}}(B^+ \rightarrow K^+\pi^0) = 0.014 \pm 0.047 \pm 0.010}$, where the first uncertainties arestatistical and the second are systematic. These results improve a previousBelle II measurement and agree with the world averages.

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