Phenomenology 2025 Symposium

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

20 May 2025, 18:00

15m

David Lawrence Hall 205, University of Pittsburgh

Quark and Lepton Flavor Physics Flavor

Speaker

Kimika Arai (University of Pittsburgh (US))

Description

The Belle and Belle~II experiments have collected a 1.1~ab${}^{-1}$ sample
of $e^{+}{e}^{-}\to B\overline{B}$ collisions at a centre-of-mass energy
corresponding to the $\mathrm{{\rm Y}}(4S)$ 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 ${\varphi }_1/\alpha$ 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
$\left|V_{ub}\right|$.

Presentation materials

BELLE2-TALK-2025-073.pdf