Measurement of CP violation in the decay B⁰→Dπ at the LHCb experiment

A measurementofthe CP asymmetries Sf and Sfbar in B⁰→Dπ decays is presented in this thesis. The analysed data set was recorded by the LHCb detector in proton-proton collision at centre-of-mass energies of 7 and 8 TeV in the years 2011 and 2012 and corresponds to an integrated luminosity of 3 fb−1. The measured CP asymmetries are Sf = 0.058 ± 0.020 (stat.) ± 0.011 (syst.) , Sfbar =0.038±0.020(stat.)±0.007(syst.). These results are more precise than and in agreement with previous determinations from the Belle and BaBar collaborations. Using these values, constraints are placed on the CKM angle 𝛾 and the CKM quantity sin(2𝛽 + 𝛾). The obtained confidence intervals are consistent with the current world-average values.