Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of branching fractions and CP-violating charge asymmetries
  in charmless $B$ decays reconstructed in 2019--2020 Belle~II data   We report on first measurements of branching fractions~($\mathcal{B}$) and
CP-violating charge asymmetries~($\mathcal{A}$) in charmless $B$ decays at
Belle~II. We use a sample of electron-positron collisions collected in 2019 and
2020 at the $\Upsilon(4S)$ resonance and corresponding to $34.6$\,fb$^{-1}$ of
integrated luminosity. We use simulation to determine optimized event
selections. The $\Delta E$ distributions of the resulting samples, restricted
in $M_{\rm bc}$, are fit to determine signal yields. Signal yields are
corrected for efficiencies determined from simulation and control data samples
to obtain branching fractions and CP-violating asymmetries for flavour-specific
channels. These are the first measurements in charmless decays reported by
Belle~II. Results are compatible with known determinations and show detector
performance comparable with the best Belle results offering a reliable basis to
assess projections for future reach.

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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th