Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The quark-gluon vertex and the QCD infrared dynamics

Full text
Author(s):
Oliveira, Orlando [1, 2] ; de Paula, Wayne [2] ; Frederico, Tobias [2] ; de Melo, J. P. B. C. [3]
Total Authors: 4
Affiliation:
[1] Univ Coimbra, Dept Fis, CFisUC, P-3004516 Coimbra - Portugal
[2] Inst Tecnolog Aeronaut, Ctr Tecn Aeroespacial, Dep Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Univ Cruzeiro Sul, Lab Fis Teor & Computac, BR-01506000 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 79, n. 2 FEB 6 2019.
Web of Science Citations: 0
Abstract

The Dyson-Schwinger quark equation is solved for the quark-gluon vertex using the most recent lattice data available in the Landau gauge for the quark, gluon and ghost propagators, the full set of longitudinal tensor structures in the Ball-Chiu vertex, taking into account a recently derived normalisation for a quark-ghost kernel form factors and the gluon contribution for the tree level quark-gluon vertex identified on a recent study of the lattice soft gluon limit. A solution for the inverse problem is computed after the Tikhonov linear regularisation of the integral equation, that implies solving a modified Dyson-Schwinger equation. We get longitudinal form factors that are strongly enhanced at the infrared region, deviate significantly from the tree level results for quark and gluon momentum below 2 GeV and at higher momentum approach their perturbative values. The computed quark-gluon vertex favours kinematical configurations where the quark momentum p and the gluon momentum q are small and parallel. Further, the quark-gluon vertex is dominated by the form factors associated to the tree level vertex.mu and to the operator 2 p mu + q mu. The higher rank tensor structures provide small contributions to the vertex. (AU)

FAPESP's process: 17/01142-4 - From the description of the non-perturbative regime of QCD to the application of quantum field theory to condensed matter physics
Grantee:Tobias Frederico
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 17/05660-0 - Theoretical studies of the structure and reactions of exotic nuclei and many-body systems
Grantee:Brett Vern Carlson
Support type: Research Projects - Thematic Grants