Measurement of the CP asymmetry in B − → D s − D 0 and B − → D − D 0 decays

Abstract The 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 ACPB−→Ds−D0=−0.4±0.5±0.5%andACPB−→D−D0=2.3±2.7±0.4% $$ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}_s^{-}{D}^0\right)=\left(-0.4\pm 0.5\pm 0.5\right)\%\kern0.5em \mathrm{and}\kern0.5em {\mathcal{A}}^{CP}\left({B}^{-}\to {D}^{-}{D}^0\right)=\left(2.3\pm 2.7\pm 0.4\right)\% $$, where the first uncertainties are statistical and the second systematic. This is the first measurement of ACPB−→Ds−D0 $$ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}_s^{-}{D}^0\right) $$ and the most precise determination of ACPB−→D−D0 $$ {\mathcal{A}}^{CP}\left({B}^{-}\to {D}^{-}{D}^0\right) $$. Neither result shows evidence of CP violation.