We report measurements of the branching fractions and direct CP asymmetries of the decays B0 → Kþπ−, Bþ → Kþπ0, Bþ → K0πþ, and B0 → K0π0, and use these for testing the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct CP asymmetry of the decay Bþ → πþπ0 and the branching fraction of the decay B0 → πþπ−. The data are collected with the Belle II detector from eþe− collisions at the ϒð4SÞ resonance produced by the SuperKEKB asymmetric-energy collider and contain 387 × 10 6 bottom-antibottom meson pairs. Signal yields are determined in two-dimensional fits to background-discriminating variables, and range from 500 to 3900 decays, depending on the channel. We obtain −0.03 0.13 0.04 for the sum rule in agreement with the standard model expectation of zero and with a precision comparable to the best existing determinations.
Measurement of branching fractions and direct CP asymmetries for B →Kπ and B →ππ decays at Belle II
F. Bianchi;S. Das;M. Destefanis;M. Maggiora;S. Marcello;S. Spataro;
2024-01-01
Abstract
We report measurements of the branching fractions and direct CP asymmetries of the decays B0 → Kþπ−, Bþ → Kþπ0, Bþ → K0πþ, and B0 → K0π0, and use these for testing the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct CP asymmetry of the decay Bþ → πþπ0 and the branching fraction of the decay B0 → πþπ−. The data are collected with the Belle II detector from eþe− collisions at the ϒð4SÞ resonance produced by the SuperKEKB asymmetric-energy collider and contain 387 × 10 6 bottom-antibottom meson pairs. Signal yields are determined in two-dimensional fits to background-discriminating variables, and range from 500 to 3900 decays, depending on the channel. We obtain −0.03 0.13 0.04 for the sum rule in agreement with the standard model expectation of zero and with a precision comparable to the best existing determinations.| File | Dimensione | Formato | |
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PhysRevD.109.012001.pdf
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