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Measurements of branching fractions and direct CP asymmetries in B⁰to K⁺ π⁻, B^+ to K_(rm S)⁰π^+ and B⁰ to π^+π^- using 2019 and 2020 data
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arxiv 2106.03766 v1 pith:IPJO4HLC submitted 2021-06-07 hep-ex
Measurements of branching fractions and direct CP asymmetries in B⁰to K⁺ π⁻, B^+ to K_(rm S)⁰π^+ and B⁰ to π^+π^- using 2019 and 2020 data
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We report updated measurements of branching fractions ($\mathcal{B}$) and CP-violating charge asymmetries ($\mathcal{A_{\rm CP}}$) for charmless $B$ decays at Belle II, which operates on or near the $\Upsilon$(4S) resonance at the SuperKEKB asymmetric energy $e^{+}e^{-}$ collider. We use samples of 2019 and 2020 data corresponding to 62.8 fb$^{-1}$ of integrated luminosity. The samples are analysed using two-dimensional fits in $\Delta E$ and $M_{\it bc}$ to determine signal yields of approximately 568, 103, and 115 decays for the channels $B^0 \to K^+\pi^-$, $B^+ \to K_{\rm S}^0\pi^+$, and $B^0 \to \pi^+\pi^-$, respectively. 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. The results are compatible with known determinations and contribute important information to an early assessment of Belle II detector performance.
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