Infrared behaviour of propagators and running coupling in the conformal\n window of QCD

2014/05/28 by Markus Hopfer, Christian S. Fischer, Hopfer, Markus +3
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.1405.7340

Abstract

Using the Dyson-Schwinger approach we investigate Landau gauge QCD with a\nrelatively large number of chiral quark flavours. A self-consistent treatment\non the propagator level enables us to study unquenching effects via the quark\nloop diagram in the gluon equation. Above the critical number of fermion\nflavours the non-perturbative running coupling develops a plateau over a wide\nmomentum range. Correspondingly, the propagators follow a power law behaviour\nin this momentum range indicating conformal behaviour. Our value\nN_f^crit=4.5 is strongly sensitive to the details of the quark-gluon vertex\ncalling for more detailed investigations in future studies.\n

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