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Tests of Light-Lepton Universality in Angular Asymmetries of ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}\ensuremath{\ell}\ensuremath{\nu}$ Decays

MPS-Authors

The Belle-II Collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adachi,  I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al., 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

The Belle-II Collaboration, Adachi, I., & et al. (2023). Tests of Light-Lepton Universality in Angular Asymmetries of ${B}^{0}\ensuremath{\rightarrow}{D}^{*\ensuremath{-}}\ensuremath{\ell}\ensuremath{\nu}$ Decays. Physical Review Letters, 131, 181801. doi:10.1103/PhysRevLett.131.181801.


Cite as: https://hdl.handle.net/21.11116/0000-000F-113A-D
Abstract
We present the first comprehensive tests of light-lepton universality in the angular distributions of semileptonic $B^0$-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 $\Upsilon\left(4S\right)\to{}B \overline{B}$ decays in data corresponding to $189~\mathrm{fb}^{-1}$ integrated luminosity from electron-positron collisions collected with the Belle II detector. We find no significant deviation from the standard model expectations.