Determination of the CKM angle φ₃ from a combination of Belle and Belle II results

We report a determination of the CKM angle φ₃, also known as γ, from a combination of measurements using samples of up to 711~fb⁻¹ from the Belle experiment and up to 362~fb⁻¹ from the Belle II experiment. We combine results from analyses of B⁺→ DK⁺, B⁺→ Dπ⁺, and B⁺ → D*K⁺ decays, where D is an admixture of D⁰ and D̄⁰ mesons, in a likelihood fit to obtain φ₃ = (78.6+7.2-7.3)∘. We also briefly discuss the interpretation of this result.