The QCD Critical End Point in the Context of the   Polyakov--Nambu--Jona-Lasinio Model
  We investigate the phase diagram of the so-called Polyakov--Nambu--Jona-Lasinio model at finite temperature and nonzero chemical potential with three quark flavors. Chiral and deconfinement phase transitions are discussed, and the relevant order-like parameters are analyzed. A special attention is payed to the critical end point (CEP): the influence of the strangeness on the location of the CEP is studied; also the strength of the flavor-mixing interaction alters the CEP location, once when it becomes weaker the CEP moves to low temperatures and can even disappear. 
Pedro Costa, C. A. de Sousa, M. C. Ruivo, H. Hansen
hep-ph