Muon pairs from In+In collision at SPS energy

Abstract

NA60 collaboration has extracted the inverse slope parameters, T_{eff} of the dimuon spectra originating from the In+In collisions at root(s_NN)=17.3 GeV for various invariant mass region. They have observed that the inverse slope parameter as a function of invariant mass of the lepton pair drops beyond the rho-peak. In the present work, first we reproduce the observed invariant mass and transverse momentum spectra of the muon pairs. Then show that the slope parameters extracted from the transverse momentum distributions for various invariant mass region windows can be explained by assuming formation of a partonic phase initially which reverts to hadronic phase through a weak first order phase transition at a temperature T_c ~ 175 MeV. It is observed that a scenario without the formation of a partonic phase does not reproduce the non-monotonic behaviour of the inverse slope parameter non typical of radial flow.

References in corpus (13)

• The QCD equation of state with dynamical quarks
• Dilepton Radiation at the CERN Super Proton Synchrotron
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• Evidence for the production of thermal muon pairs with masses above 1 GeV/c^2 in 158A GeV Indium-Indium Collisions
• NA60 results on thermal dimuons
• Evidence for radial flow of thermal dileptons in high-energy nuclear collisions
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Thermal Dimuon Yields at NA60
• Dimuon transverse momentum spectra as a tool to characterize the emission region in heavy-ion collisions
• Analytic structure of rho meson propagator at finite temperature
• Thermal dileptons at SPS energies
• Elliptic flow of thermal photons in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• $\varphi$ Meson Production in In-In Collisions and the $\varphi$ Puzzle

Cited by in corpus (7)

• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Thermal Dileptons as Fireball Thermometer and Chronometer
• Observing many body effects on lepton pair production from low mass enhancement and flow at RHIC and LHC energies
• Radial Flow from Electromagnetic Probes and Signal of Quark Gluon Plasma
• In-medium vector mesons and low mass lepton pairs from heavy ion collisions
• Electromagnetic signals from Au+Au collisions at RHIC energy, $\sqrt{s_{NN}}$=200 GeV and Pb+Pb collisions at LHC energy, $\sqrt{s_{NN}}$=2.76 TeV
• Dilepton production from SIS to LHC energies