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 (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 B0 → D − lν Decays

Bianchi, F.;Das, S.;Destefanis, M.;Maggiora, M.;Marcello, S.;Spataro, S.;
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 (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.
2023
131
18
181801-1
181801-7
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.181801
Electroweak interaction, Leptonic semileptonic & radiative decays, W & Z bosons, Bottom mesons, Flavor symmetries, Lepton colliders
Adachi, I.; Adamczyk, K.; Aggarwal, L.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Aversano, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2069028
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