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  • Measurement of $CP$ violation in $B^0\to D^{\pm} D^{\mp}$ decays
    Aslanides, E; Barsuk, S; Bediaga, I; Bernstein, H. C; Betancourt, C; Blago, M. P; Capriotti, L; Cenci, R; Cerasoli, J; Chitic, S. -G; Collins, P; De Cian, M; Dean, C. T; Delaney, B; Dendek, A; Denysenko, V; Di Canto, A; Didenko, S; Dordei, F; Reis, A. C. dos; Durante, P; Egede, U; Fitzpatrick, C; Fleuret, F; Fontanelli, F; Gao, Y; Pardiñas, J. García; Plana, B. Garcia; Gioventù, A; Gligorov, V. V; Govorkova, E; Hancock, T. H; Harrison, T; Heuel, J; Ivshin, K; Jacobsson, R; Jiang, F; Kenzie, M; Kim, K. E; Kirn, T; Klaver, S; Krawczyk, R. D; Kress, F; Lacarrere, D; Lafferty, G; Lazzeroni, C; Leverington, B; Li, H; Li, Y; Lu, Y; Lyu, X; Malinin, A; Mancinelli, G; Meloni, S; Naik, P; Neufeld, N; Nieswand, S; Onderwater, C. J. G; Goicochea, J. M. Otalora; Oyanguren, A; Pais, P. R; Pescatore, L; Petrov, A; Poliakova, M; Polyakov, I; Popov, A; Qian, W; Roehrken, M; Roth, J. D; Ryzka, J; Savrina, D; Schiller, M; Schmidt, B; Serra, N; Shekhtman, L; Skidmore, N; Skwarnicki, T; Smith, E; Smith, I. T; Snoch, A; Stahl, S; Sun, J; Sun, Y; Taneja, S; Tilley, M. J; T'Jampens, S; Tully, A; Tuning, N; Van Hulse, C. B; Regueiro, P. Vazquez; Sierra, C. Vázquez; Vollhardt, A; Walsh, J; Wang, M; Wilkinson, G; Winn, M; Yang, Z; Yeomans, L. E; Yin, H; Yuan, X

    12/2019
    Journal Article

    Journal of High Energy Physics, 03 (2020) 147 The decay-time-dependent $CP$ asymmetry in $B^0 \to D^{*\pm}D^{\mp}$ decays is measured using a data set corresponding to an integrated luminosity of $9$fb$^{-1}$ recorded by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The $CP$ parameters are measured as $ S_{D^*D} = -0.861 \pm 0.077\,\text{(stat)} \pm 0.019 \,\text{(syst)}\,, $ $ \Delta S_{D^*D} = 0.019 \pm 0.075 \,\text{(stat)} \pm 0.012 \,\text{(syst)} \,, $ $ C_{D^*D} = -0.059 \pm 0.092 \,\text{(stat)} \pm 0.020 \,\text{(syst)} \,, $ $ \Delta C_{D^*D} = -0.031 \pm 0.092 \,\text{(stat)} \pm 0.016 \,\text{(syst)} \,, $ $ {\cal A}_{D^*D} = 0.008 \pm 0.014 \,\text{(stat)} \pm 0.006 \,\text{(syst)}\,. $ The analysis provides the most precise single measurement of $CP$ violation in this decay channel to date. All parameters are consistent with their current world average values.

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