CP violation in B decays to charmonia at LHCb

Measurements of CP violation in decays of beauty hadrons to charmonia final states provide a fundamental test of Standard Model (SM) predictions and represent a sensitive probe to search for physics effects beyond the SM. In these proceedings, precision measurements are presented of several observables related to the so-called unitary triangles, that arise from the unitarity requirements on the 3x3 Cabibbo-Kobayashi-Maskawa matrix describing the quark mixing. The discussed analyses are based on proton-proton collision data collected during 2011 and 2012 (LHC Run 1) by the LHCb experiment.