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https://hdl.handle.net/10316/106926
Title: | The quark-gluon vertex and the QCD infrared dynamics | Authors: | Oliveira, Orlando de Paula, Wayne Frederico, Tobias de Melo, J. P. B. C |
Issue Date: | 2019 | Publisher: | Springer Nature | Project: | Fundação de Amparo à Pesquisa do Estado de São Paulo [FAPESP Grant No. 17/05660-0], Conselho Nacional de Desenvolvimento Científico e Tecnológico [CNPq Grant 308486/2015-3] and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) of Brazil. project INCT-FNA Proc. No. 464898/2014-5 CAPES process 88887.156738/2017-00 and FAPESP Grant Number 2017/01142-4 CNPq, contracts 401322/2014-9 and 308025/2015-6 project FAPESP Temático, No. 2017/05660-0 |
Serial title, monograph or event: | European Physical Journal C | Volume: | 79 | Issue: | 2 | 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 γμ and to the operator 2 pμ + qμ. The higher rank tensor structures provide small contributions to the vertex. | URI: | https://hdl.handle.net/10316/106926 | ISSN: | 1434-6044 1434-6052 |
DOI: | 10.1140/epjc/s10052-019-6617-7 | Rights: | openAccess |
Appears in Collections: | I&D CFis - Artigos em Revistas Internacionais |
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