which triggered some interest among particle theorists regarding possible impact of physics beyond the Standard Model. In 2020, LHCb announced discovery of time-dependent CP violation in decays of Bs mesons. The oscillation frequency of Bs mesons to its antiparticle and vice versa was measured to a great precision in 2021. Rare decays Rare decays are the decay modes harshly suppressed in the Standard Model, which makes them sensitive to potential effects from yet unknown physics mechanisms. In 2014, LHCb and CMS experiments published a joint paper in Nature announcing the discovery of the very rare decay , rate of which was found close to the Standard Model predictions. This measurement has harshly limited the possible parameter space of supersymmetry theories, which have predicted a large enhancement in rate. Since then, LHCb has published several papers with more precise measurements in this decay mode. Anomalies were found in several rare decays of B mesons. The most famous example in the so-called angular observable was found in the decay , where the deviation between the data and theoretical prediction has persisted for years. The decay rates of several rare decays also differ from the theoretical predictions, though the latter have sizeable uncertainties. Lepton flavour universality In the Standard Model, couplings of charged leptons (electron, muon and tau lepton) to the gauge bosons are expected to be identical, with the only difference emerging from the lepton masses. This postulate is referred to as "lepton flavour universality". As a consequence, in decays of b hadrons, electrons and muons should be produced at similar rates, and the small difference due to the lepton masses is precisely calculable. LHCb has found deviations from this predictions by comparing the rate of the decay to that of , and in similar processes. However, as the decays in question are very rare, a larger dataset needs to be analysed in order to make definitive conclusions. In March 2021, LHCb announced that the anomaly in lepton universality crossed the "3 sigma" statistical significance threshold, which translates to a p-value of 0.1%. The measured value of , where symbol denotes probability of a given decay to happen, was found to be while the Standard Model predicts it to be very close to unity. In December 2022 improved measurements discarded this anomaly. Other measurements LHCb has contributed to studies of quantum chromodynamics, electroweak physics, and provided cross-section measurements for astroparticle physics. See