Time-dependent CP-violation measurements in $B^0 \to D^+D^–$ decays at LHCb

Overconstraining the unitarity triangle is a key goal of LHCb. The excellent time resolution of the detector lends itself to high precision time dependent CP violation measurements. CP observables in $B^0 \to D^{+}D^{‐}$ decays are of great interest as they have the potential to be sensitive to new physics contributions. There is a long¬‐existing tension between results from BaBar and Belle on $B^0 \to D^{+}D^{‐}$. We present results on these CP observables with the full Run 1 dataset.