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FPCP / Measurement of $B^0$ and $B_s^0$ mixing phases at LHCb

The mixing phases of the B0 and Bs mesons represent two fundamental standard candles to validate the CP-violation paradigm of the Standard Model (SM) and to search for new physics beyond it. Decay modes governed by tree-level $b\to c\bar{c}q$ transitions allow precise and theoretically clean determinations of the SM values of these quantities. On the other hand, the same quantities can be measured using decay modes receiving major contributions from penguin diagrams. A discrepancy between the two results may reveal the presence of new physics appearing in the loops. The most recent measurements of B0 and Bs mixing phases at LHCb are summarised in this presentation.

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