A time-dependent, flavour-tagged measurement of CP violation is performed with {B^0}\rightarrow{D^{+}D^{-}} and {B^{0}_{s}}\rightarrow{D^{+}_{s}D^{-}_{s}} decays, using data collected by the LHCb detector in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 6 fb^{-1}. In {B^0}\rightarrow{D^{+}D^{-}} decays the CP-violation parameters are measured to be \begin{align}... Show more