Measurements of branching fractions and CP-violating charge asymmetries in charmless $B$ decays reconstructed in 2019–2020 Belle II data
Creators: name: Abudinén, F.
name: Adachi, I.
name: Adak, R.
name: Adamczyk, K.
name: Ahlburg, P.
name: Ahn, J. K.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Ameli, F.
name: Andricek, L.
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name: Asner, D. M.
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name: Aulchenko, V.
name: Aushev, T.
name: Aushev, V.
name: Aziz, T.
name: Babu, Varghese
name: Bacher, S.
name: Baehr, S.
name: Bahinipati, S.
name: Bakich, A. M.
name: Bambade, P.
name: Banerjee, Sw.
name: Bansal, S.
name: Barrett, M.
name: Batignani, G.
name: Baudot, J.
name: Beaulieu, A.
name: Becker, J.
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name: Bender, M.
name: Bennett, J. V.
name: Bernieri, E.
name: Bernlochner, F. U.
name: Bertemes, M.
name: Bessner, M.
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name: Chang, M.-C.
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Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020
Subjects: electron positron: annihilation
CP: violation
charge: asymmetry
detector: performance
BELLE
KEK-B
B: branching ratio
electron positron: colliding beams
Upsilon(10570): electroproduction
efficiency
numerical calculations: Monte Carlo
experimental results

description: 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.