| Summary: | We consider large-angle two photon production in e+e− annihilation as a possible process to monitor the luminosity of a future e+e− circular collider (FCC-ee). We review and assess the status of the theoretical accuracy by performing a detailed phenomenological study of next-to-leading order electroweak corrections and leading logarithmic QED contributions due to multiple photon radiation. We also estimate the impact of photonic and fermion-loop corrections at next-to-next-to-leading order and the uncertainty induced by the hadronic contribution to the vacuum polarization. Possible perspectives to address the target theoretical accuracy are briefly discussed. Keywords: Electron-positron colliders, Luminosity, Two photon production, QED, Electroweak corrections, Theoretical accuracy
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