Abstract
The finite temperature transition or crossover in QCD with two degenerate Wilson quarks is investigated using a renormalization group improved action. At β = 2.0 and 2.1 where a −1 ∼ 1.0 – 1.2 GeV, the expectation value of the Polyakov loop and the pion screening mass on an 8 3 × 4 lattice vary smoothly with the hopping parameter through the transition/crossover. The quark screening mass in the high temperature phase agrees well with that in the low temperature phase calculated on an 8 4 lattice. The smooth transition of the observables is totally different from the sharp transition found for the standard action at β = 5.0 and 5.1 where a −1 is also 1.0 – 1.2 GeV.
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