FUTURE CIRCULAR COLLIDER – FRANCE

The FCC-ee in a few words

The FCC-ee project is a high-luminosity, high-precision e+e- circular collider. Two separate e+ and e- storage rings with very strong focusing, fed by a full size continuous injector, provide e+e- collision luminosities ranging from (per interaction point) 230 10³⁴ /cm2 /s at the Z pole, 8 10³⁴ /cm² /s at the ZH production maximum (240 GeV) and 1.7 10³⁴ /cm² /s at the tt threshold and up to 365 GeV. Four interaction points are considered. The run plan of 15-20 years yields 5 10¹² Z bosons, 10⁸ W pairs, 1.3 10⁶ Higgs bosons and 106 top quark pairs. Thanks to the availability of transverse polarization, the energy calibration at 100 keV precision offers unprecedented precision for measurements of Z and W properties. The possibility of s-channel Higgs production at E_CM=125 GeV is under study, giving unique access to the electron Yukawa coupling. These opportunities make the FCC-ee stand out among the other Higgs factory proposals. Especially at the Z run, considerable challenges await experimenters and theorists, for systematic uncertainties to match the extraordinary available statistical precision.

Following the ESPP 2020 recommendations, the goal until 2025 of the Physics Experiments and Detector studies will be, with widest participation from the international community, the delivery of an advanced Feasibility Study demonstrating the breath and feasibility of the experimental program, including detector designs. The present focus on the experimental side is the analysis of physics benchmark measurements with the aim of producing a consistent set of detector requirements, under the aegis of the Physics Performance Coordination. The design of the detectors, the use of the latest technologies, and the R&D program, offer great opportunities for creativity. On the phenomenological side, focus will be the full understanding of the possibilities for discovery of the machine, as well as the planning of the precision calculations required to fully exploit the program of precision measurements.

The French HEP community is involved in most of the PED aspects of the FCC Feasibility Study. See the Organisation folder to see how it is organized and how you can join the effort.