Dilepton production from a viscous QGP

Abstract

This work calculates the first correction to the leading order qq dilepton production rates due to shear viscosity in an expanding gas. The modified rates are integrated over the space-time history of a viscous hydrodynamic simulation of RHIC collisions. The net result is a {\em hardening} of $q_{\perp }$ spectrum with the magnitude of the correction increasing with invariant mass. We argue that a thermal description is reliable for invariant masses less than $M_{max}\approx (2{\tau }_0{T}_0^2)/(\eta /s)$. For reasonable values of the shear viscosity and thermalization time $M_{max}\approx 4.5$ GeV. Finally, the early emission from a viscous medium is compared to emission from a longitudinally free streaming plasma. Qualitative differences in $q_{\perp }$ spectrum are seen which could be used to extract information on the thermalization time, viscosity to entropy ratio and possibly the thermalization mechanism in heavy-ion collisions.

17 pages, 8 figures

References in corpus (11)

• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Flow at the SPS and RHIC as a Quark Gluon Plasma Signature
• The Effect of Shear Viscosity on Spectra, Elliptic Flow, and HBT Radii
• Transport coefficients in high temperature gauge theories: (I) Leading-log results
• Suppression of elliptic flow in a minimally viscous quark-gluon plasma
• Dissipative hydrodynamics for viscous relativistic fluids
• Causal Viscous Hydrodynamics for Central Heavy-Ion Collisions
• Causal Viscous Hydrodynamics for Central Heavy-Ion Collisions II: Meson Spectra and HBT Radii
• Transverse Energy Evolution as a Test of Parton Cascade Models
• A simple out-of-equilibrium field theory formalism ?
• Triple-quark elastic scatterings and thermalization

Cited by in corpus (41)

• Bulk viscosity, particle spectra and flow in heavy-ion collisions
• Pre-equilibrium dilepton production from an anisotropic quark-gluon plasma
• Non-boost-invariant anisotropic dynamics
• Dilepton emission in high-energy heavy-ion collisions with viscous hydrodynamics
• Transport coefficients of a hot QCD medium and their relative significance in heavy-ion collisions
• Photons as a viscometer of heavy ion collisions
• Photon Emission from a Momentum Anisotropic Quark-Gluon Plasma
• Thermal photons from heavy ion collisions: A spectral function approach
• Electromagnetic radiation as a probe of the initial state and of viscous dynamics in relativistic nuclear collisions
• Photon production from a non-equilibrium quark-gluon plasma
• Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
• Dilepton production and elliptic flow from an anisotropic quark-gluon plasma
• Causal Viscous Hydrodynamics for Relativistic Heavy Ion Collisions
• Exploring the influence of bulk viscosity of QCD on dilepton tomography
• Heavy quark transport in an anisotropic hot QCD medium: Collisional and Radiative processes
• A study of charm quark dynamics in quark-gluon plasma with 3+1 D viscous hydrodynamics
• Particle production in relativistic heavy-ion collisions: A consistent hydrodynamic approach
• Cavitation and thermal dilepton production in QGP
• Dimuon radiation at the CERN SPS within a (3+1)d hydrodynamic+cascade model
• Indications of early thermalization in relativistic heavy-ion collisions
• Dilepton flow and deconfinement phase transition in heavy ion collisions
• Viscous hydrodynamics with bulk viscosity -- uncertainties from relaxation time and initial conditions
• Heavy quark transport coefficients in a viscous QCD medium with collisional and radiative processes
• Di-electron production from vector mesons with medium modifications in heavy ion collisions
• Investigating the temperature dependence of the specific shear viscosity of QCD matter with dilepton radiation
• Dilepton production in a schematic causal viscous hydrodynamics
• Viscous modifications to quark and gluon distribution functions in quark-gluon plasma medium
• Radiative heavy quark energy loss in an expanding viscous QCD plasma
• The refractive index in the viscous quark-gluon plasma
• Effective distributions of quasi-particles for thermal photons
• Dilepton production in high energy heavy ion collisions with 3+1D relativistic viscous hydrodynamics
• Shear viscosity of an ultrarelativistic Boltzmann gas with isotropic inelastic scattering processes
• Dilepton Helical Production in a Vortical Quark-Gluon Plasma
• A relativistic dissipative hydrodynamic description for systems including particle number changing processes
• Heavy quark damping rate in hot viscous QCD plasma
• Thermal dilepton production in collisional hot QCD medium in the presence of chromo-turbulent fields
• Second order hydrodynamics based on effective kinetic theory and electromagnetic signals from QGP
• Thermal dilepton production within conformal viscous Gubser flow
• Color-electric conductivity in a viscous quark-gluon plasma
• Exploring hadron-quark phase transition in heavy-ion collisions using particle emission ratios in heavy and light reaction systems
• Formulation of relativistic dissipative fluid dynamics and its applications in heavy-ion collisions