Di-electron production from vector mesons with medium modifications in heavy ion collisions

Abstract

We reproduce the di-electron spectra in the low and intermediate mass regions in most central Au+Au collisions by the STAR Collaboration incorporation of the STAR detector acceptance. We also compare our results with PHENIX data constrained by the PHENIX acceptance. We include the medium modifications of vector mesons from scatterings of vector mesons by mesons and baryons in the thermal medium. The freezeout contributions from vector mesons are also taken into account. The space-time evolution is described by a 2+1 dimensional ideal hydrodynamic model. The backgrounds from semi-leptonic decays of charm hadrons are simulated by the PYTHIA event generator and corrected by the nuclear modification factor of electrons from charm decays. It is difficult to extract the thermal contributions from those from charm decays in the invariant mass spectra alone and in the current detector acceptances. Other observables such as transverse momenta and collective flows may provide additional tools to tag these sources.

ReVTex 4, 8 pages, 7 figures. Section II and later part of section IV have been re-written. Parameters are chosen to keep the same entropy. Baryonic contributions to the rho meson propagators are included. The main results are re-calculated. The comparison to PHENIX data is added. More references are added

References in corpus (14)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Equation of state and QCD transition at finite temperature
• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Measurements of $\varphi$ meson production in relativistic heavy-ion collisions at RHIC
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• Dilepton mass spectra in p+p collisions at sqrt(s)= 200 GeV and the contribution from open charm
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Thermal Dimuon Yields at NA60
• Elliptic flow of thermal dileptons in relativistic nuclear collisions
• Dimuon transverse momentum spectra as a tool to characterize the emission region in heavy-ion collisions
• Dilepton production from a viscous QGP
• Dragging $D$ mesons by hot hadrons
• Dielectron continuum production from $\sqrt{s_{NN}}$ = 200 GeV p + p and Au + Au collisions at STAR
• Theory and Phenomenology of Vector Mesons in Medium

Cited by in corpus (14)

• Measurements of Dielectron Production in Au$+$Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV from the STAR Experiment
• Dielectron Mass Spectra from Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV
• Energy dependence of acceptance-corrected dielectron excess mass spectrum at mid-rapidity in Au+Au collisions at $\sqrt{s_{NN}}=19.6$ and 200 GeV
• Highlights from STAR
• The STAR Dilepton Physics Program
• Charm quarks in medium and their contribution to di-electron spectra in relativistic heavy ion collisions
• The low and intermediate mass dilepton and photon results
• Elliptic flow of thermal dileptons in event-by-event hydrodynamic simulation
• Dielectron Azimuthal Anisotropy at mid-rapidity in Au+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Dilepton Measurements at STAR
• Heavy Flavor, Quarkonia, and Electroweak Probes at Quark Matter 2012
• The di-lepton physics program at STAR
• Dileptons at Colliders as Probes of the Quark-Gluon Plasma
• Dielectron production from $\sqrt{s_{NN}}$ = 200 GeV Au + Au collisions at STAR