Field-strength correlators for QCD in a magnetic background

Abstract

We present the results of an exploratory study (by means of Monte Carlo simulations on the lattice) of the properties of the gauge-invariant two-point correlation functions of the gauge-field strengths for $N_f=2$ QCD at zero temperature and in the presence of a magnetic background field: the analysis provides evidence for the emergence of anisotropies in the nonperturbative part of the correlators and for an increase of the gluon condensate as a function of the external magnetic field.

Comments: To appear in the proceedings of the "38th International Conference on High Energy Physics" (ICHEP 2016), Chicago (USA), 3-10 August 2016; 6 pages, 1 figure