Outlook for the Theoretical Precision of the Luminosity at Future Lepton Colliders
Abstract
The LEP precision physics requirements on the theoretical precision tag for the respective luminosity were 0.054 \% (0.061\%) at MZ, where the former (latter) LEP result has (does not have) the pairs correction. For the contemplated FCC-ee, ILC, and CEPC Higgs/EW factories, one needs improvement at MZ to at least 0.01\% for the theoretical precision tag. We discuss the paths one may take to even exceed this latter goal and present an update on the current expectations for both MZ and proposed higher energy scenarios.
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