The QCD critical end point driven by an external magnetic field in   asymmetric quark matter
  The effect of the isospin/charge asymmetry and an external magnetic field in the location of the critical end point (CEP) in the QCD phase diagram is investigated. By using the 2+1 flavor Nambu--Jona-Lasinio model with Polyakov loop (PNJL), it is shown that the isospin asymmetry shifts the CEP to larger baryonic chemical potentials and smaller temperatures, and in the presence of a large enough isospin asymmetry the CEP disappears. Nevertheless, a sufficiently high external magnetic field can drive the system into a first order phase transition again. 
Pedro Costa, M\'arcio Ferreira, Constan\c{c}a Provid\^encia, Hubert   Hansen, D\'ebora P. Menezes
hep-ph