Measurement of B → K*(892)γ decays at Belle II

Abstract

We present measurements of B → K*(892)γ decays using 365 fb−1 of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider. The data sample contains (387 ± 6) × 106 Υ(4S) events. We measure branching fractions () and CP asymmetries () for both B0→ K*0γ and B+→ K*+γ decays. The difference in CP asymmetries () and the isospin asymmetry (∆0+) between these neutral and charged channels are also measured. We obtain the following branching fractions and CP asymmetries:,,, and. The measured difference in CP asymmetries is, and the measured isospin asymmetry is ∆0+ = (+4.8 ± 2.0 ± 1.8)%. The first uncertainties listed are statistical and the second ..