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(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

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Oliveira, Orlando [1, 2] ; de Paula, Wayne [2] ; Frederico, Tobias [2] ; de Melo, J. P. B. C. [3]
Total Authors: 4
[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

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 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