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We investigate the chiral properties of QCD in presence of a magneticbackground field and in the low temperature regime, by lattice numericalsimulations of N_f = 2 QCD. We adopt a standard staggered discretization, witha pion mass around 200 MeV, and explore a range of magnetic fields (180 MeV)^2\leq|e|B \leq (700 MeV)^2, in which we study magnetic catalysis, i.e. theincrease of chiral symmetry breaking induced by the background field. Wedetermine the dependence of the chiral condensate on the external field,compare our results with existing model predictions and show that a substantialcontribution to magnetic catalysis comes from the modified distribution ofnon-Abelian gauge fields, induced by the magnetic field via dynamical quarkloop effects.

Chiral Properties of Strong Interactions in a Magnetic Background