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We have studied the vector meson spectral function (VMSF) in a hot and dense medium within an effective QCD model namely the Nambu–Jona-Lasinio (NJL) and its Polyakov Loop extended version (PNJL) with and without the effect of isoscalar vect or interaction (IVI). The effect of the IVI has been taken into account using the ring approximat ion. We obtained the dilepton production rate (DPR) using the VMSF and observed that at mod erate temperature it is enhanced in the PNJL model as compared to the NJL and Born rate due to the suppression of color degrees of freedom. We also computed the conserved density fluctuati on ssociated with the temporal correlation function appropriate for a hot and dense medium .

Mesonic spectral functions in effective mean field model.