Abstract

By Monte Carlo simulation on the lattice, we calculate the high-temperature behaviour of the energy density ϵ in SU(2) and SU(3) QCD with Wilson fermions. From the leading term of the hopping parameter expansion, we find that ϵ converges very rapidly to the Stefan-Boltzmann limit of an asymptotically free quark-gluon gas. The behaviour in the non-asymptotic region indicates that chiral symmetry restoration occurs at a higher temperature ( T ch) than colour deconfinement ( T c), with T ch T c ≈ 1.3 .

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