Multi-gluon vertices in Lattice QCD

Lattice QCD is one of the most successful approaches to understand QCD, the theory of quarks and gluons. The study of the low energy regime of this quantum field theory requires non-perturbative methods, like the formulation of QCD in a space-time lattice. Indeed, a space-time lattice provides a natural regulator of the theory. Together with the imaginary time formalism, it allows for a first principles numerical simulation of QCD. Lattice QCD research requires the use of HPC resources. This Advanced Computing Project aims to improve our previous study of the three-gluon vertex and perform a first lattice study of the four-gluon vertex in Landau gauge. These correlation functions can improve our description of the forces in multiple particle states (e.g. glueballs, tetraquarks). Furthermore, from these vertices one can compute the running coupling constant. The investigation of higher order correlation functions in lattice QCD, due to the large fluctuations, demands ensembles with a very large number of gauge configurations and the development of methods that improve the signal to noise ratio for the vertices.

Status: Concluded

Starting date: 1/Jan/2021

End date: 31/Dec/2021

Financing: 2 978 400 CPU core.hours Euros

Financing entity: FCT

Person*month: 0

Group person*month: 0