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We have simulated lattice QCD with 2 flavours of massless staggered quarks.An irrelevant chiral 4-fermion interaction was added to the standard quarkaction to allow us to simulate at zero quark mass. Thermodynamics was studiedon lattices of temporal extent 6. Clear evidence for a second order chiraltransition was observed and the critical exponents $\beta_{mag}$, $\delta$,$\nu$ and $\gamma_{mag}$ were measured. These exponents did not agree withthose expected by standard universality arguments. They were, however,consistent with tricritical behaviour. The $\pi$ and $\sigma$ screening masseswere measured and showed clear evidence for chiral symmetry restoration at thistransition.Comment: 32 pages, 11 figures. Revtex with postscript figures. Analysis of  table II redone assuming 1/V finite volume effect

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Scaling behavior at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>t</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>=</mml:mo><mml:mn>6</mml:mn><mml:mn /></mml:math>chiral phase transition for 2-flavor lattice QCD with massless staggered quarks, and an irrelevant 4-fermion interaction

Scaling behavior at theNt=6chiral phase transition for 2-flavor lattice QCD with massless staggered quarks, and an irrelevant 4-fermion interaction