An important task of the modern research in particle physicsis is to measure the properties of the Cabibbo-Kobayashi-Maskawa (CKM)matrix. The CKM matrix governs the mixing between mass and flavour eigenstates of quarks and is responsible of the breaking of the CP symmetry in the Standard Model (SM), hence, in the very end, of the imbalance between matter and anti-matter in the Universe. Probing the consistency and the unitarity of the CKM matrix is fundamental to verify the validity of the SM and to look for physics beyond. Using the measurements of CP-violation parameters and branching ratios of the B0→π+π−, B0→π0π0, B+→π+π0 and B0s→K+K− decays, a bayesian analysis is performed to determine two parameters of the CKM matrix: the angle γ and the mixing phase, −2βs, of the B0s meson
