Monte-Carlo study of the $Δρ$ parameter

Details Monte-Carlo study of the $Δρ$ parameter Monte-Carlo study of the $Δρ$ parameter

1996-08-07

arxiv.org/abs/hep-lat/9608031v1

Nucl.Phys.Proc.Suppl.53:683-685,1997

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages (LateX) with 3 figures (PostScript), uses espcrc2.sty (included). Talk presented at LATTICE96(other models)

Scientific paper

10.1016/S0920-5632(96)00753-0

We present results concerning a lattice study of the electroweak $\rho$-parameter. We have used an SU(2)$\times$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 $\Delta\rho$ are well described by one-loop perturbation theory with the same finite volume and with the same finite cut-off. However, a finite cut-off can cause substantial deviations of $\Delta\rho$ from the standard value, even in infinite volume.

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