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We present the results of an exploratory study (by means of Monte Carlosimulations on the lattice) of the properties of the gauge-invariant two-pointcorrelation functions of the gauge-field strengths for $N_f=2$ QCD at zerotemperature and in the presence of a magnetic background field: the analysisprovides evidence for the emergence of anisotropies in the nonperturbative partof the correlators and for an increase of the gluon condensate as a function ofthe external magnetic field.

Field-strength correlators for QCD in a magnetic background