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We report on first measurements of branching fractions~($\mathcal{B}$) andCP-violating charge asymmetries~($\mathcal{A}$) in charmless $B$ decays atBelle~II. We use a sample of electron-positron collisions collected in 2019 and2020 at the $\Upsilon(4S)$ resonance and corresponding to $34.6$\,fb$^{-1}$ ofintegrated luminosity. We use simulation to determine optimized eventselections. The $\Delta E$ distributions of the resulting samples, restrictedin $M_{\rm bc}$, are fit to determine signal yields. Signal yields arecorrected for efficiencies determined from simulation and control data samplesto obtain branching fractions and CP-violating asymmetries for flavour-specificchannels. These are the first measurements in charmless decays reported byBelle~II. Results are compatible with known determinations and show detectorperformance comparable with the best Belle results offering a reliable basis toassess projections for future reach.

Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019--2020 Belle~II data