Fermion Self-Energy and Chiral Symmetry Breaking from Four-Fermion and Gauge Interactions

Details Fermion Self-Energy and Chiral Symmetry Breaking from Four-Fermion and Gauge Interactions Fermion Self-Energy and Chiral Symmetry Breaking from Four-Fermion and Gauge Interactions

1998-11-19

arxiv.org/abs/hep-ph/9811392v2

Commun.Theor.Phys.30:583-588,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, Latex, 1 figure, the figure put in body of the paper by epsf

Scientific paper

The exact analytic solutions of the linearized Schwinger-Dyson equation of fermion self-energy are used to obtain the effective four-fermion and gauge coupling criticality curves for dynamical chiral symmetry breaking. The results show that when the zero-momentum gauge coupling $\alpha(0) < \alpha_0(0)$, the critical gauge coupling in the pure gauge interaction case, the minimal critical four-fermion coupling $\beta_{\rm min}$ is always non-zero and positive and will go up as the $\alpha(0)$ decreases. The use of the exact solutions also allow us to make quite definite estimations of the momentum scales where chiral symmetry breaking would happen if the values of an infrared parameter $\xi$ are given separately.

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