2-FLAVOR CHIRAL PHASE-TRANSITION IN LATTICE QCD WITH THE KOGUT-SUSSKIND QUARK ACTION

A summary is presented of a scaling study of the finite-temperature ch iral phase transition of two-flavor QCD with the Kogut-Susskind quark action based on simulations on L-3 x 4 (L = 8, 12 and 16) lattices at the quark mass of m(q) = 0.075, 0.0375, 0.02 and 0.01. We find a phase transition to be absent for m(q) greater than or equal to 0.02, and a lso quite likely at m(q) = 0.01. The quark mass dependence of suscepti bilities is consistent with a second-order transition at m(q) = 0. The exponents, however, deviate from the O(2) and O(4) values theoretical ly expected.