Abstract
We present results concerning a lattice study of the electroweak ϱ-parameter. We have used an SU (2) × U (1) symmetric chiral Yukawa model built with Zaragoza fermions. The decoupling of the species doublers in this model is verified numerically. We find that the numerical data for Δϱ are well described by one-loop perturbation theory in the same finite volume and with the same finite cut-off. However, a finite cut-off can cause substantial deviations of Δϱ from the standard value, even in infinite volume.
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