PRECISION MEASUREMENTS ARE AN ESSENTIAL PART OF  MODERN PARTICLE PHYSICS

They make it possible to test the predictions of the Standard Model and to search for signs of new physics. The proposed Future Electron-Positron Circular Collider (FCC-ee) would be the world’s largest circular lepton collider and a state-of-the-art precision instrument for particle physics. The FCC-ee would create millions of Higgs particles, allowing physicists to study their properties with far greater precision than the LHC does today. More than a Higgs factory, it would allow physicists to study with precision the heaviest particles of the Standard Model (i.e. Z and W bosons, top quark) and their interactions. The FCC-ee would not only study the electroweak sector with unprecedented precision, but would also look for the answers to the still unsolved questions of fundamental physics. It would open many possibilities to directly and indirectly discover new phenomena. Once the FCC-ee physics programme came to an end, the same tunnel would be used to house a proton-proton collider, the FCC-hh.