TY - JOUR

T1 - Schwinger-Dyson equation and NJL approximation in massive gauge theory with fermions

AU - Zubkov, M. A.

N1 - Publisher Copyright:
© 2014 Elsevier Inc.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - We consider massive SU(. N) gauge theory with fermions. Gauge bosons become massive due to the interaction with the scalar field, whose vacuum average provides the spontaneous breakdown of gauge symmetry. We investigate Dyson-Schwinger equation for the fermion propagator written in ladder approximation and in Landau gauge. Our analysis demonstrates that the chiral symmetry breaking in the considered theory is the strong coupling phenomenon. There are the indications that there appears the second order phase transition between chirally broken and symmetric phases of the theory at the value of coupling constant αc=(1+γ)×π3×12C2(F), where 0. <. γ. <. 1, and γ depends on the scale, at which the fluctuations of the scalar field destroy the gauge boson mass. In the broken phase near the critical value of α the Dyson-Schwinger equation is approximated well by the gap equation of the effective Nambu-Jona-Lasinio model with the value of cutoff around gauge boson mass M and the effective four-fermion coupling constant 4παM2×2C2(F)N. The dynamical fermion mass m may be essentially smaller than M.

AB - We consider massive SU(. N) gauge theory with fermions. Gauge bosons become massive due to the interaction with the scalar field, whose vacuum average provides the spontaneous breakdown of gauge symmetry. We investigate Dyson-Schwinger equation for the fermion propagator written in ladder approximation and in Landau gauge. Our analysis demonstrates that the chiral symmetry breaking in the considered theory is the strong coupling phenomenon. There are the indications that there appears the second order phase transition between chirally broken and symmetric phases of the theory at the value of coupling constant αc=(1+γ)×π3×12C2(F), where 0. <. γ. <. 1, and γ depends on the scale, at which the fluctuations of the scalar field destroy the gauge boson mass. In the broken phase near the critical value of α the Dyson-Schwinger equation is approximated well by the gap equation of the effective Nambu-Jona-Lasinio model with the value of cutoff around gauge boson mass M and the effective four-fermion coupling constant 4παM2×2C2(F)N. The dynamical fermion mass m may be essentially smaller than M.

KW - Chiral symmetry breaking

KW - Composite Higgs bosons

KW - Dyson-Schwinger equations

KW - Massive gauge theory

KW - Nambu-Jona-Lasinio approximation

UR - http://www.scopus.com/inward/record.url?scp=84920901895&partnerID=8YFLogxK

U2 - 10.1016/j.aop.2014.12.007

DO - 10.1016/j.aop.2014.12.007

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AN - SCOPUS:84920901895

SN - 0003-4916

VL - 354

SP - 72

EP - 88

JO - Annals of Physics

JF - Annals of Physics

ER -