Running coupling in the conformal window of large-Nf QCD
arXiv:1405.7031 · doi:10.1007/JHEP11(2014)035
Abstract
Quantum Chromodynamics with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the beyond-tree-level tensor structures of the quark-gluon vertex.
arXiv comment22 pages, 10 figures, additional clarifications and a reference added, version accepted by JHEP
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