Work

Scale-setting, flavor dependence, and chiral symmetry restoration

Year: 2017

Type: article

Abstract: We determine the flavor dependence of the renormalization-group-invariant running interaction through judicious use of both unquenched Dyson-Schwinger equation and lattice results for QCD's gauge-sector two-point functions. An important step is the introduction of a physical scale setting procedure that enables a realistic expression of the effect of different numbers of active quark flavours on the interaction. Using this running interaction in concert with a well constrained class of dressed--gluon-quark vertices, we estimate the critical number of active lighter-quarks above which dynamical chiral symmetry breaking becomes impossible: ${n}_{f}^{\mathrm{cr}}\ensuremath{\approx}9$; and hence in whose neighborhood QCD is plausibly a conformal theory.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.95.114009

Authors: Daniele Binosi, Craig D. Roberts, José Rodríguez-Quintero

Institutions: Fondazione Bruno Kessler, European Centre for Theoretical Studies in Nuclear Physics and Related Areas, Argonne National Laboratory, Universidad de Granada, Universidad de Huelva

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green