Sumitted to PubDB: 2024-07-29

Category: Proceeding, Visibility: Public

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Authors	Michele Mantovano
Date	2024-07-21
Belle II Number	BELLE2-CONF-PROC-2024-015
Abstract	The Belle and Belle II experiments have collected a $1.1$\,ab${}^{-1}$ sample of $e^{+}{e}^{-}\to B\overline{B}$ collisions at the $\mathrm{{\rm Y}}(4S)$ resonance. These data, with low particle multiplicity, constrained initial state kinematics and excellent lepton identification, are an ideal environment to study lepton-flavour universality in semileptonic decays of the $B$ meson. We present measurements of branching-fraction ratios that test the universality of $\tau$ and light leptons, using both exclusive and inclusive $B$ semileptonic decays. We also report measurements of angular observables that probe universality between electrons and muons.

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