Seminarium Fizyki Wielkich Energii

The CMS experiment has delivered numerous significant measurementsusing data from LHC Run-2 and the ongoing Run-3. This report explainskey components of the CMS detector relevant to heavy flavour physics. Theshort introduction to CP violation in Bs → J/ψϕ(1020) is given, followedby the recent CMS results, confirming the CP violation in this channel. Thesearch for CP violation in Ds → Ks0 Ks0 channel is presented. In addition themost important information on selected recent CMS heavy flavour physicsresults is highlighted. It includes: measurement of Bs → J/ψKS effectivelifetime, test of lepton flavour universality with RJ/ψ and search for raredecays in D0 → µ+ µ− . Finally the CMS measurements of B/Bs → µ+ µ−are reminded.