QCD and $\gamma\,\gamma$ studies at FCC-ee

TL;DR

FCC-ee, a proposed high-luminosity electron-positron collider, will enable precise tests of the Standard Model, detailed QCD studies, and photon-photon collision analyses, opening new avenues for both SM and BSM physics exploration.

Contribution

This paper summarizes the potential of FCC-ee for high-precision QCD measurements and photon-photon collision studies, highlighting its unique capabilities compared to previous colliders.

Findings

Potential for precise determination of the QCD coupling constant

Ability to analyze parton radiation and fragmentation in detail

Opportunities for SM and BSM physics through photon-photon collisions

Abstract

The Future Circular Collider (FCC) is a post-LHC project aiming at searches for physics beyond the SM in a new 80--100~km tunnel at CERN. Running in its first phase as a very-high-luminosity electron-positron collider (FCC-ee), it will provide unique possibilities for indirect searches of new phenomena through high-precision tests of the SM. In addition, by collecting tens of ab$^{-1}$ integrated luminosity in the range of center-of-mass energies $\sqrt{s}$~=90--350~GeV, the FCC-ee also offers unique physics opportunities for precise measurements of QCD phenomena and of photon-photon collisions through, literally, billions of hadronic final states as well as unprecedented large fluxes of quasireal $\gamma$'s radiated from the $\rm e^+e^-$ beams. We succinctly summarize the FCC-ee perspectives for high-precision extractions of the QCD coupling, for detailed analyses of parton radiation and fragmentation, and for SM and BSM studies through $\gamma\gamma$ collisions.