Analytic determination of the T-\mu phase diagram of the chiral quark   model
  Using a gap equation for the pion mass a nonperturbative method is given for solving the chiral quark-meson model in the chiral limit at the lowest order in the fermion contributions encountered in a large N_f approximation. The location of the tricritical point is analytically determined. A mean field potential is constructed from which critical exponents can be obtained. 
A. Jakovac, A. Patkos, Zs. Szep, P. Szepfalusy