Measurement of $CP$ Violation in $B^0 \to D^{(*)}D$ decays at LHCb

The measurement of parameters associated with $CP$ Violation in $B^0 \to D^+D^-$ and $B^0 \to D^{+*}D^-$ decays are presented. The first analysis is concluded and the values obtained from a fit to the decay time distribution of flavor-tagged candidates provides an evidence of $CP$ violation at a significance level of 4.0 standard deviations, allowing to constrain the phase shift due to higher-order SM corrections to the world’s most precise value. The analysis associated to the second channel is ongoing and preliminary studies performed on the sensitivity to $CP$ observables show that LHCb can rival the results obtained by previous experiments.