Numerical investigation of lattice Weinberg - Salam model

TL;DR

This paper numerically investigates the lattice Weinberg-Salam model near the phase transition, revealing nonperturbative phenomena at energies above 1 TeV, relevant for understanding continuum physics.

Contribution

It provides the first detailed numerical analysis of the lattice Weinberg-Salam model without fermions near the phase transition, highlighting nonperturbative effects at high energies.

Findings

Nonperturbative phenomena emerge above 1 TeV

Phase transition region approaches continuum physics

Indications of new physics beyond perturbation theory

Abstract

Lattice Weinberg - Salam model without fermions for the value of the Weinberg angle $\theta_W \sim 30^o$, and bare fine structure constant around $\alpha \sim 1/150$ is investigated numerically. We consider the value of the scalar self coupling corresponding to bare Higgs mass around 150 GeV. We investigate phenomena existing in the vicinity of the phase transition between the physical Higgs phase and the unphysical symmetric phase of the lattice model. This is the region of the phase diagram, where the continuum physics is to be approached. We find the indications that at the energies above 1 TeV nonperturbative phenomena become important in the Weinberg - Salam model.