We investigate the chiral properties of QCD in the presence of a magnetic background ﬁeld and in the low temperature regime, by lattice numerical simulations of Nf = 2 QCD. We adopt a standard staggered discretization, with a pion mass around 200 MeV, and explore a range of magnetic ﬁelds (180 MeV)^2 < eB < (700 MeV)^2, in which we study magnetic catalysis, i.e. the increase of chiral symmetry breaking induced by the background ﬁeld. We determine the dependence of the chiral condensate on the external ﬁeld, compare our results with existing model predictions and show that a substantial contribution to magnetic catalysis comes from the modiﬁed distribution of non-Abelian gauge ﬁelds, induced by the magnetic ﬁeld via dynamical quark loop effects.
|Autori interni:||D'ELIA, MASSIMO|
|Autori:||D'ELIA M; NEGRO F|
|Titolo:||Chiral properties of strong interactions in a magnetic background|
|Anno del prodotto:||2011|
|Digital Object Identifier (DOI):||10.1103/PhysRevD.83.114028|
|Appare nelle tipologie:||1.1 Articolo in rivista|