Critical exponents of the chiral transition in strong coupling QCD

Abstract

We study the critical behaviour of the chiral phase transition of SU(3) lattice QCD with one species of staggered fermions in the strong coupling limit. We find a second-order phase transition which seems to be controlled by an effective action which is in the same universality class as three-dimensional O(2) spin models. In particular, we find for the exponent δ, 0.18 < 1/ δ < 0.25, in good agreement with the three-dimensional O(2) value, 1/ δ = 0.21.