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

Sumitted to PubDB: 2020-09-22

Category: Conference papers and plots, Visibility: Public

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Authors Fernando Abudinen, Paoti Chang, Eldar Ganiev, Riccardo Manfredi, Hans-Günther Moser, Sebastiano Raiz, Markus Reif, Diego Tonelli, Benedikt Wach
Non-Belle II authors Y.-C. Chen, C.-H. Li
Date Sept. 20, 2020
Belle II Number BELLE2-CONF-PH-2020-012
Abstract We report on first measurements of branching fractions~(B) and CP-violating charge asymmetries~(ACP) in charmless B decays at Belle~II. We use a sample of electron-positron collisions collected in 2019 and 2020 at the Υ(4S) resonance and corresponding to 34.6\,fb1 of integrated luminosity. We use simulation to determine optimized event selections. The ΔE distributions of the resulting samples, restricted in Mbc, are fit to determine signal yields ranging from 35 to 450 decays for the channels \mbox{B0K+π}, \mbox{B+K+π0}, \mbox{B+\PKzSπ+}, \mbox{B0\PKzSπ0}, \mbox{B0π+π}, \mbox{B+π+π0}, \mbox{B+K+KK+}, and \mbox{B+K+ππ+}. Signal yields are corrected for efficiencies determined from simulation and control data samples to obtain the following results: Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' Unknown environment 'center' 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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