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  • Tests of light-lepton universality in angular asymmetries of $B^0 \to D^{-} \ell \nu$ decays
    Adachi, I; Aloisio, A; Asner, D. M; Aushev, V; Bahinipati, S; Bambade, P; Beaubien, A; Bennett, J. V; Bertacchi, V; Bianchi, F; Biswas, D; Bondar, A; Branchini, P; Campajola, M; Cecchi, C; Cerasoli, J; Chang, M. -C; Cheon, B. G; Chilikin, K; Cho, H. -E; Dey, S; Doležal, Z; Jiménez, I. Domínguez; Fodor, A; Garcia-Hernandez, M; Garg, R; Gaudino, G; Gaz, A; Ghosh, D; Ghumaryan, H; Giakoustidis, G; Giri, A; Gradl, W; Guan, Y; Hara, T; Hedges, M. T; de la Cruz, I. Heredia; Higuchi, T; Ito, S; Jin, Y; Junkerkalefeld, H; Ketter, C; Kim, D. Y; Koga, T; Kuzmin, A; Kwon, Y. -J; Lai, Y. -T; Lewis, P. M; Li, C; Libby, J; Longo, S; Lyu, C; Maharana, S. P; Maiti, R; Martellini, C; Metzner, F; Miller, C; Mirra, M; Molina-Gonzalez, N; Mondal, S; Moneta, S; Mrvar, M; Mussa, R; Otani, F; Paladino, A; Peruzzi, I; Praz, C; Prell, S; Prencipe, E; Purwar, H; Reiter, S; Remnev, M; Rizzo, G; Roehrken, M; Sangal, A; Scavino, B; Senyo, K; Sevior, M. E; Sfienti, C; Sharma, C; Skorupa, J; Sokolov, A; Stottler, Z. S; Stroili, R; Sutcliffe, W; Svidras, H; Tanida, K; Tiwary, R; Tonelli, D; Torassa, E; Uematsu, Y; Urquijo, P; Varvell, K. E; Veronesi, M; Wach, B; Wang, E; Warburton, A; Yamada, S; Yang, S. B; Zhilich, V

    08/2023
    Journal Article

    Phys. Rev. Lett. 131, 181801 (Published 31 October 2023) 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.

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