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We analyze the production rate of dileptons from the deconfined medium using a quark propagator obtained from a lattice QCD numerical simulation. We calculate the dilepton production rate nonperturbatively at two temperatures in the deconfined phase with the quark propagator obtained on the lattice. The photon-quark vertex is determined gauge-invariantly, so as to satisfy the WardTakahashi identity. The obtained dilepton production rate shows an enhancement of factor 10 or so compared with the rate from free quark systems at low invariant mass region and structure known as van Hove singularity.

Dilepton production spectrum above Tc analyzed with a lattice quark propagator