Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II

Sumitted to PubDB: 2024-07-29

Category: Proceeding, Visibility: Public

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Authors Michele Mantovano
Date July 21, 2024
Belle II Number BELLE2-CONF-PROC-2024-015
Abstract The Belle and Belle II experiments have collected a $1.1$\,ab$^{-1}$ sample of $e^{+}e^{-} \rightarrow B\bar B$ collisions at the $\Upsilon(4S)$ 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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