Low Mass Dilepton Rate from the Deconfined Phase
arXiv:1010.2169 · doi:10.1103/PhysRevC.83.014908
Abstract
We discuss low mass dilepton rates ( GeV) from the deconfined phase of QCD using both perturbative and non-perturbative models and compare with those from lattice gauge theory and in-medium hadron gas. Our analysis suggests that the rate at very low invariant mass ( MeV) using the nonperturbative gluon condensate in a semiempirical way within the Green function dominates over the Born-rate and independent of any uncertainty associated with the choice of the strong coupling in perturbation theory. On the other hand the rate from interaction in the deconfined phase is important between 200 MeV M\ge 200M\ge 500$ MeV, constraining on the broad resonance structures in the dilepton rate at large invariant mass. We also discuss the lattice constraints on the low mass dilepton rate. Furthermore, we discuss a more realistic way to advocate the quark-hadron duality hypothesis based on the dilepton rates from QGP and hadron gas than it is done in the literature.
24 pages, 9 figures; Discussion added, Accepted in Phys. Rev. C
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