Can transport peak explain the low-mass enhancement of dileptons at RHIC?

Abstract

We propose a novel relation between the low-mass enhancement of dielectrons observed at PHENIX and transport coefficients of QGP such as the charge diffusion constant $D$ and the relaxation time ${\tau }_{\mathrm{J}}$. We parameterize the transport peak in the spectral function using the second-order relativistic dissipative hydrodynamics by Israel and Stewart. Combining the spectral function and the full (3+1)-dimensional hydrodynamical evolution with the lattice EoS, theoretical dielectron spectra and the experimental data are compared. Detailed analysis suggests that the low-mass dilepton enhancement originates mainly from the high-temperature QGP phase where there is a large electric charge fluctuation as obtained from lattice QCD simulations.

To appear in the conference proceedings for Quark Matter 2011, May 23 - May 28, Annecy, France

References in corpus (4)

• The QCD equation of state with dynamical quarks
• Detailed measurement of the e+e- pair continuum in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV and implications for direct photon production
• Spectral densities for hot QCD plasmas in a leading log approximation
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Cited by in corpus (10)

• Transport coefficients for the hot quark-gluon plasma at finite chemical potential ${\mu }_B$
• Shear viscosity $\eta$ to electrical conductivity ${\sigma }_{el}$ ratio for an anisotropic QGP
• Shear viscosity and electric conductivity of a hot and dense QGP with a chiral phase transition
• Diffusion coefficient matrix of the strongly interacting quark-gluon plasma
• Electrical and thermal conductivities of hot and dense hadron gas
• Electrical conductivity of hadronic matter from different possible mesonic and baryonic thermal fluctuations
• Conductivity, diffusivity, and violation of Wiedemann-Franz Law in a hadron resonance gas with van der Waals interactions
• Eigenstate Thermalization in 2+1 dimensional SU(2) Lattice Gauge Theory
• Estimating transport coefficients of interacting pion gas with K-matrix cross sections
• QCD at finite chemical potential in and out-of equilibrium