Beam-beam deflection biases the FCC-ee small-angle Bhabha luminosity measurement by about 0.19% at the Z pole, and the proposed in-situ acollinearity and dimuon-based calibrations can reduce the residual to below the 10^-4 target.
Abada et al.,FCC-ee: The Lepton Collider, The European Physical Journal Special Topics228 (Jun, 2019) 261–623
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Beam-beam effects on the luminosity measurement at FCC-ee
Beam-beam deflection biases the FCC-ee small-angle Bhabha luminosity measurement by about 0.19% at the Z pole, and the proposed in-situ acollinearity and dimuon-based calibrations can reduce the residual to below the 10^-4 target.