We present the first comprehensive tests of the universality of the light leptons in the angular distributions of semileptonic B0-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry observables as functions of the decay recoil that are sensitive to lepton-universality-violating contributions. We use events where one neutral B is fully reconstructed in ϒ(4S)→BB decays in data corresponding to 189 fb-1 integrated luminosity from electron-positron collisions collected with the Belle II detector. We find no significant deviation from the standard model expectations.
Tests of Light-Lepton Universality in Angular Asymmetries of B^{0}→D^{*-}ℓν Decays
Bettarini, S;Casarosa, G;Corona, L;Forti, F;Massaccesi, L;Mondal, S;Paoloni, E;Rizzo, G;Tenchini, F;
2023-01-01
Abstract
We present the first comprehensive tests of the universality of the light leptons in the angular distributions of semileptonic B0-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry observables as functions of the decay recoil that are sensitive to lepton-universality-violating contributions. We use events where one neutral B is fully reconstructed in ϒ(4S)→BB decays in data corresponding to 189 fb-1 integrated luminosity from electron-positron collisions collected with the Belle II detector. We find no significant deviation from the standard model expectations.File in questo prodotto:
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