Check of a new non-perturbative mechanism for elementary fermion mass generation

TL;DR

This paper explores a non-perturbative mechanism for generating elementary fermion masses through a specific field theory model, potentially offering an alternative to the Higgs mechanism, and discusses how to demonstrate this via lattice simulations.

Contribution

It introduces a theoretical framework for a non-perturbative fermion mass generation mechanism and proposes lattice simulations to demonstrate its viability.

Findings

The model exhibits a phase where fermions acquire a dynamical mass.

A critical Yukawa coupling can restore chiral symmetry perturbatively.

Lattice simulations are planned to verify the non-perturbative mass generation.

Abstract

We consider a field theoretical model where a SU(2) fermion doublet, subjected to non-Abelian gauge interactions, is also coupled to a complex scalar field doublet via a Yukawa and an irrelevant Wilson-like term. Despite the presence of these two chiral breaking operators in the Lagrangian, an exact symmetry acting on fermions and scalars prevents perturbative mass corrections. In the phase where fermions are massless (Wigner phase) the Yukawa coupling can be tuned to a critical value at which chiral transformations acting on fermions only become a symmetry of the theory (up to cutoff effects). In the Nambu-Goldstone phase of the critical theory a fermion mass term of dynamical origin is expected to arise in the Ward identities of the purely fermionic chiral transformations. Such a non-perturbative mechanism of dynamical mass generation can provide a "natural" (\`a la 't Hooft) alternative to the Higgs mechanism adopted in the Standard Model. Here we lay down the theoretical framework necessary to demonstrate the existence of this mechanism by means of lattice simulations.