Kızılersü, Ayşe and Oliveira, Orlando and Silva, Paulo J. and Skullerud, Jon-Ivar and Sternbeck, André (2021) Quark-gluon vertex from Nf=2 lattice QCD. Physical Review D, 103 (11). 114515-11-114515-21. ISSN 2470-0010

Preview

Download (2MB) | Preview

Abstract

We study the quark-gluon vertex in the limit of vanishing gluon momentum using lattice QCD with two flavors of O(a) improved Wilson fermions, for several lattice spacings and quark masses. We find that all three form factors in this kinematics have a significant infrared strength and that both the leading form factor λ1, multiplying the tree-level vertex structure, and the scalar, chiral symmetry breaking form factor λ3 are significantly enhanced in the infrared compared to the quenched (Nf=0) case. These enhancements are orders of magnitude larger than predicted by one-loop perturbation theory. We find only a weak dependence on the lattice spacing and quark mass.

Item Type:	Article
Keywords:	Quark-gluon; vertex; Nf = 2; lattice; QCD;
Academic Unit:	Faculty of Science and Engineering > Research Institutes > Hamilton Institute Faculty of Science and Engineering > Theoretical Physics
Item ID:	15665
Identification Number:	https://doi.org/10.1103/PhysRevD.103.114515
Depositing User:	Dr. Jonivar Skullerud
Date Deposited:	14 Mar 2022 12:55
Journal or Publication Title:	Physical Review D
Publisher:	American Physical Society
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

Repository Staff Only(login required)

Item control page

Downloads

Origin of downloads