Observing many body effects on lepton pair production from low mass enhancement and flow at RHIC and LHC energies

Understand

The $\rho$ spectral function at finite temperature calculated using the real-time formalism of thermal field theory is used to evaluate the low mass dilepton spectra.

• The analytic structure of the $\rho$ propagator is studied and contributions to the dilepton yield in the region below the bare $\rho$ peak from the different cuts in the spectral function are discussed.
• The space-time integrated yield shows significant enhancement in the region below the bare $\rho$ peak in the invariant mass spectra.
• It is argued that the variation of the inverse slope of the transverse mass ($M_T$) distribution can be used as an efficient tool to predict the presence of two different phases of the matter during the evolution of the system.