Effect of quark masses on the QCD presssure in a strong magnetic   background
  We compute the two-loop contribution to the QCD pressure in a strong magnetic background, for arbitrary quark masses. We show that, for very large fields, the chiral limit is trivial. 
Jean-Paul Blaizot, Eduardo S. Fraga and Leticia F. Palhares
hep-ph hep-lat hep-th