The infrared properties of the transverse structure of the quark-gluon vertex

• Grant number: 18/09684-3
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Effective date (Start): September 01, 2018
• Effective date (End): August 31, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Arlene Cristina Aguilar
• Grantee: Clara Teixeira Figueiredo
• Supervisor: Joannis Papavassiliou
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Research place: Universitat de València, Spain
• Associated to the scholarship: 16/11894-0 - Aspects of the dynamical mass generation in the formalism of the Schwinger-Dyson equations, BP.DR

Abstract

In this project, we propose to perform a detailed analysis of the quark-gluon vertex using as main tool the so-called Schwinger-Dyson equations.The most general Lorentz decomposition for this quantity consists in twelve tensorial structures which are accompanied by the corresponding form factors. Each of these form factors depends on three independent variables, namely the moduli of two momenta and the angle between them. A decomposition commonly employed in the studies of this vertex divides it into two parts: one that saturates its Slavnov-Taylor identity and the transverse part, which is often neglected due to several difficulties. The aim of this project is precisely to determine the nonperturbative behavior of the form factors of the transverse part. In order to do that, we will first study the quark-gluon vertex perturbatively and, then, with the help of its Schwinger-Dyson equation, we will look at it from a nonperturbative point of view.As an application, we will study the impact of the transverse form factors on the dynamical quark mass generation phenomenon.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

AGUILAR, A. C.; FERREIRA, M. N.; FIGUEIREDO, C. T.; PAPAVASSILIOU, J.. Nonperturbative Ball-Chiu construction of the three-gluon vertex. Physical Review D, v. 99, n. 9, MAY 10 2019. (16/11894-0, 18/09684-3, 17/05685-2, 17/07595-0)

AGUILAR, A. C.; FERREIRA, M. N.; FIGUEIREDO, C. T.; PAPAVASSILIOU, J.. Gluon mass scale through nonlinearities and vertex interplay. Physical Review D, v. 100, n. 9, NOV 27 2019. (18/09684-3, 17/05685-2, 16/11894-0, 17/07595-0)

AGUILAR, A. C.; FERREIRA, M. N.; FIGUEIREDO, C. T.; PAPAVASSILIOU, J.. Nonperturbative structure of the ghost-gluon kernel. Physical Review D, v. 99, n. 3, FEB 28 2019. (16/11894-0, 18/09684-3, 17/05685-2, 17/07595-0)