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.
Future Circular Collider - European Strategy Update Documents: The FCC integrated programme (FCC-int)
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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.