Measurement of the $CP$ asymmetry in $B^-\to D_s^-D^0$ and $B^-\to D^-D^0$ decays

International audienceThe CP asymmetry in B$^{−}$ → D$_{s}^{−}$ D$^{0}$ and B$^{−}$ → D$^{−}$D$^{0}$ decays is measured using LHCb data corresponding to an integrated luminosity of 3.0 fb$^{−1}$, collected in pp collisions at centre-of-mass energies of 7 and 8 TeV. The results are $ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}_s^{-}{D}^0\right)=\left(-0.4\pm 0.5\pm 0.5\right)\%\kern0.5em \mathrm{and}\kern0.5em {\mathcal{A}}^{CP}\left({B}^{-}\to {D}^{-}{D}^0\right)=\left(2.3\pm 2.7\pm 0.4\right)\% $ , where the first uncertainties are statistical and the second systematic. This is the first measurement of $ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}_s^{-}{D}^0\right) $ and the most precise determination of $ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}^{-}{D}^0\right) $ . Neither result shows evidence of CP violation