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FPCP / Measurement of CPV in Bs->J/psi phi decays

Precise measurements of CP violation provide stringent tests of the Standard Model towards a search for signs of new physics. The decay-time dependent CP asymmetry in Bs → J/ψ φ decays has been measured using proton-proton, pp, collision data, collected with the LHCb detector. The CP-violating phase φs is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the Bs − Bsbar system, and the average Bs decay width. Discussed are the machine-learning based data selection, data-driven corrections to simulated event samples, and the control of systematic effects using control sample. Prospects for the sensitivity that can be achieved with future LHCb data taking periods will be also given.

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