Correlation functions in the infrared regime of QCD with a gluon mass - Profa. Marcela Peláez

Seminário apresentado pela Profa. Marcela Peláez (U. de la República Uruguay) no TQCBR em 19/10/2022.

Título:

Correlation functions in the infrared regime of QCD with a gluon mass.

Resumo:

Quantum Chromodynamics (QCD) is the quantum field theory that describes the strong nuclear interaction, which is responsible for binding together protons and neutrons to form atomic nuclei. QCD is described in terms of the fundamental particles: quarks and gluons, which have never been seen isolated in nature due to Confinement. For that reason studying quarks and gluons is a difficult task. Fortunately, at large energies they behave as free particles and therefore the standard perturbative analysis gives very good results. However, this is not the situation in the low energy regime of QCD which is generally treated with nonperturbative methods. In spite of this, lattice simulations observe that the expansion parameter is not too large in the gluonic sector. We use a model that includes a mass for the gluon (Curci-Ferrari) that can reproduce the behaviour of the coupling constant found by the lattice simulations. Using the small parameter we compute perturbatively the infrared behaviour of correlation functions and compare them with lattice data, obtaining very good results.