Shu-Ping Lin

24 March 2024
Moriond EW 2024 - Electroweak Interactions & Unified Theories

Abstract: Analyses of meson decays to charmless hadronic final states are an important aspect of the Belle II program. They are sensitive to effects from non-standard model physics and provide experimentally precise constraints on the weak interactions of quarks. We present recent Belle II results on branching fractions and direct -violating asymmetries of the decays B0->K+pi-, B+->K+pi0, B+->K0pi+, and B0->K0pi0, and use these to test the standard model through an isospin-based sum rule. In addition, we measure the branching fraction and direct asymmetry of the decay B+->pi+pi0 and the branching fraction of the decay B0->pi+pi-. The data are collected with the Belle II detector from the SuperKEKB asymmetric- energy e+e- collider, consisting of 387 million Upsilon(4S)->BBbar events. 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.