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arXiv · 0712.2208

On the dynamical breaking of chiral symmetry: a new mechanism

Emidio Gabrielli
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Abstract

We consider a U(1) gauge theory, minimally coupled to a massless Dirac field, where a higher-derivative term is added to the pure gauge sector, as in the Lee-Wick models. We find that this term can trigger chiral symmetry breaking at low energy in the weak coupling regime. Then, the fermion field acquires a mass that turns out to be a function of both the energy scale associated to the higher-derivative term and the gauge coupling. The dependence of the fermion mass on the gauge coupling is non-perturbative. Extensions to SU(N) gauge theories and fermion-scalar interactions are also analyzed, as well as to theories with massive gauge fields. A few implications of these results in the framework of quark-mass generation are discussed.

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Emidio Gabrielli. 2008-02-21. On the dynamical breaking of chiral symmetry: a new mechanism. https://doi.org/10.1103/physrevd.77.055020

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