https://doi.org/10.1051/epjconf/202431204007
Measurements of lepton-flavour universality in semileptonic B decays at Belle and Belle II
1 Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
2 INFN Sezione di Trieste, I-34127 Trieste, Italy
* e-mail: michele.mantovano@ts.infn.it
Published online: 20 November 2024
The Belle and Belle II experiments have collected a 1.1 ab−1 sample of e+e− BB¯ collisions at the ϒ(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 τ 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.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
