Cabibbo-Kobayashi-Maskawa matrix related measurements at Belle and Belle II

Sumitted to PubDB: 2025-05-14

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Authors	Kimika Arai
Date	2025-05-14
Belle II Number	BELLE2-TALK-2025-073
Abstract	The Belle and Belle~II experiments have collected a 1.1~ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data allow measurements of $CP\!$ violation and the Cabibbo-Kobayashi-Maskawa matrix elements in $B$-meson decay. In particular, we measure the $CP$-violating phase $\phi_1/\alpha$ and $\left\|V_{cb}\right\|$. In addition, we present constraints on the branching fractions of $B^+\to\ell^+\nu~(\ell=\mu,~\tau)$, which are related to $\left\|V_{ub}\right\|$
Conference	Phenomenology 2025 Symposium (PHENO2025) (start: 2025-05-19)