Low-mass dilepton production through transport process in quark-gluon plasma

Abstract

We attempt to understand the low-mass dielectron enhancement observed by PHENIX Collaboration at Relativistic Heavy Ion Collider (RHIC) by transport peak in the spectral function. On the basis of the second-order formalism of relativistic dissipative hydrodynamics, we parameterize the spectral function in low-frequency and long-wavelength region by two transport coefficients, electric diffusion coefficient $D$ and relaxation time ${\tau }_{\mathrm{J}}$, and compared our theoretical dielectron spectra with the experimental data. We study spectrum of dielectrons produced in relativistic heavy ion collisions by using the profile of matter evolution under full (3+1)-dimensional hydrodynamics. We find that the experimental data require the diffusion coefficient to be $D\ge 2/T$, with $T$ being temperature. Our analysis shows that dielectrons emitted through transport process mainly come from high-temperature QGP phase.

26 pages, 16 figures

References in corpus (11)

• Glauber Modeling in High Energy Nuclear Collisions
• The QCD equation of state with dynamical quarks
• Hydrodynamic Models for Heavy Ion Collisions
• Spectral functions at small energies and the electrical conductivity in hot, quenched lattice QCD
• Mass ordering of differential elliptic flow and its violation for phi mesons
• Low mass dilepton production at ultrarelativistic energies
• Enhancement of thermal photon production in event-by-event hydrodynamics
• Dielectron continuum production from $\sqrt{s_{NN}}$ = 200 GeV p + p and Au + Au collisions at STAR
• Renormalized Linear Kinetic Theory as Derived from Quantum Field Theory - a novel diagrammatic method for computing transport coefficients -
• Heavy Quark diffusion from lattice QCD spectral functions
• In-Medium Vector Mesons, Dileptons and Chiral Restoration

Cited by in corpus (4)

• Estimation of electric conductivity of the quark gluon plasma via asymmetric heavy-ion collisions
• Electromagnetic Radiation in Hot QCD Matter: Rates, Electric Conductivity, Flavor Susceptibility and Diffusion
• Charge-dependent anisotropic flow in high-energy heavy-ion collisions from relativistic resistive magneto-hydrodynamic expansion
• Dielectron production from $\sqrt{s_{NN}}$ = 200 GeV Au + Au collisions at STAR