Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-01-13
Phys.Rev. D65 (2002) 116008
Physics
High Energy Physics
High Energy Physics - Phenomenology
REVTEX4, 38 pages, 18 figures. The abstract is shortened; version to be published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.65.116008
We investigate dynamical chiral symmetry breaking in vector-like gauge theories in $D$ dimensions with ($D-4$) compactified extra dimensions, based on the gap equation (Schwinger-Dyson equation) and the effective potential for the bulk gauge theories within the improved ladder approximation. The non-local gauge fixing method is adopted so as to keep the ladder approximation consistent with the Ward-Takahashi identities. Using the one-loop $\bar{\rm MS}$ gauge coupling of the truncated KK effective theory which has a nontrivial ultraviolet fixed point (UV-FP) $g_*$ for the (dimensionless) bulk gauge coupling ${\hat g}$, we find that there exists a critical number of flavors, $N_f^{\rm crit}$ ($\simeq 4.2, 1.8$ for $D=6, 8$ for SU(3) gauge theory): For $N_f > N_f^{\rm crit}$, the dynamical chiral symmetry breaking takes place not only in the ``strong-coupling phase'' (${\hat g} >g_*$) but also in the ``weak-coupling phase'' (${\hat g}
Gusynin Valery
Hashimoto Makoto
Tanabashi Masaharu
Yamawaki Koichi
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