# Delta-rho in an SU(2) X U(1) chiral Yukawa model

## TL;DR

This paper discusses ongoing simulations of an SU(2) x U(1) fermion-Higgs model with non-degenerate fermions, aiming to study species doubler decoupling, triviality bounds, and the Delta-rho parameter non-perturbatively.

## Contribution

It introduces a non-perturbative simulation approach for a chiral lattice fermion model with non-degenerate fermions, comparing Zaragoza and naive fermions.

## Key findings

- Preliminary insights into species doubler decoupling
- Initial bounds on Higgs and fermion masses
- Early results on Delta-rho phenomenological parameter

## Abstract

We report on a simulation in progress of an SU(2) X U(1) fermion-Higgs model with two *non-degenerate* fermion doublets. The Zaragoza proposal for chiral lattice fermions is used; naive fermions are studied for comparison. The aims of this simulation are a non-perturbative study of the decoupling of species doublers, of triviality bounds on the Higgs and fermion masses and of the phenomenological quantity Delta-rho.

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Source: https://tomesphere.com/paper/hep-lat/9509061