Schwinger displacement of the quark–gluon vertex

被引:3
作者
Aguilar A.C. [1 ]
Ferreira M.N. [2 ]
Ibañez D. [3 ]
Papavassiliou J. [2 ]
机构
[1] Institute of Physics Gleb Wataghin, University of Campinas-UNICAMP, São Paulo, Campinas
[2] Department of Theoretical Physics and IFIC, University of Valencia and CSIC, Valencia
[3] Muelle de la Aduana, University Centre EDEM, La Marina de Valencia, Valencia
来源
European Physical Journal C | 2023年 / 83卷 / 10期
关键词
Approximation theory - Elementary particles - Integral equations - Quantum theory;
D O I
10.1140/epjc/s10052-023-12103-8
中图分类号
学科分类号
摘要
The action of the Schwinger mechanism in pure Yang–Mills theories endows gluons with an effective mass, and, at the same time, induces a measurable displacement to the Ward identity satisfied by the three-gluon vertex. In the present work we turn to Quantum Chromodynamics with two light quark flavors, and explore the appearance of this characteristic displacement at the level of the quark–gluon vertex. When the Schwinger mechanism is activated, this vertex acquires massless poles, whose momentum-dependent residues are determined by a set of coupled integral equations. The main effect of these residues is to displace the Ward identity obeyed by the pole-free part of the vertex, causing modifications to its form factors, and especially the one associated with the tree-level tensor. The comparison between the available lattice data for this form factor and the Ward identity prediction reveals a marked deviation, which is completely compatible with the theoretical expectation for the attendant residue. This analysis corroborates further the self-consistency of this mass-generating scenario in the general context of real-world strong interactions. © 2023, The Author(s).
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