Offline Computing resources for FCC-ee and related challenges

The international Future Circular Collider (FCC) study aims at designing $\mathrm {pp}$, $\mathrm {e^{+}e^{-}}$, $\mathrm {e^{\pm }p}$ colliders to be built in a new 100-km tunnel in the Geneva region. The electroweak, Higgs and top factory (FCC-ee) is designed to provide collisions at a centre-of-mass energy range between 90 (Z-pole) and 365 GeV ($\mathrm {t}\bar{\mathrm {t}}$) and unprecedented integrated luminosities, producing huge amounts of data which will pose significant challenges to data processing. In this study, we discuss the needs in terms of storage and CPU for the diverse phases of the project, and the possible solutions mostly based on the models developed for HL-LHC.