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Title: Scale-setting, flavor dependence, and chiral symmetry restoration

Here, 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 cr f ≈ 9; and hence in whose neighborhood QCD is plausibly a conformal theory.
Authors:
; ;
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FPA2014-53631-C-2-P
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Dyson-Schwinger equations; dynamical chiral symmetry breaking; gluon-quark vertex; non-Abelian gauge-sector dynamics; numerical simulations of lattice-regularised QCD
OSTI Identifier:
1369032
Alternate Identifier(s):
OSTI ID: 1363841