Thermal photon to dilepton ratio in ultra-relativistic heavy ion collisions

Abstract

The ratio of transverse momentum distribution of thermal photons to dilepton has been evaluated. It is observed that this ratio reaches a plateau beyond a certain value of transverse momentum. We argue that this ratio can be used to estimate the initial temperature of the system by selecting the transverse momentum and invariance mass windows judiciously. It is demonstrated that if the radial flow is large then the plateau disappear and hence a deviation from the plateau can be used as an indicator of large radial flow. The sensitivity of the results on various input parameters has been studied.

arXiv comment9 pages with 11 eps figures

References in corpus (43)

• The QCD transition temperature: results with physical masses in the continuum limit
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Photon and Gluon Emission in Relativistic Plasmas
• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• Static quark anti-quark interactions in zero and finite temperature QCD. I. Heavy quark free energies, running coupling and quarkonium binding
• Photon Emission from Ultrarelativistic Plasmas
• The transition temperature in QCD
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Hadronic Production of Thermal Photons
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Baryon Stopping and Charged Particle Distributions in Central Pb+Pb Collisions at 158 GeV per Nucleon
• Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• High energy photons from passage of jets through quark gluon plasma
• Bremsstrahlung and photon production in thermal QCD
• Dilepton Radiation at the CERN Super Proton Synchrotron
• What QCD sum rules tell about the rho meson
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• Thermal Photons and Lepton Pairs from Quark Gluon Plasma and Hot Hadronic Matter
• Effects of in-medium vector meson masses on low-mass dileptons from SPS heavy-ion collisions
• QCD equation of state with 2+1 flavors of improved staggered quarks
• Evidence for radial flow of thermal dileptons in high-energy nuclear collisions
• NA60 results on the rho spectral function in In-In collisions
• Hard Thermal Photon Production in Relativistic Heavy Ion Collisions
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Photons from Pb-Pb Collisions at CERN SPS
• Velocity of sound in relativistic heavy-ion collisions
• Photon emission in heavy ion collisions at the CERN SPS
• Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC
• Photons from Hadronic Matter at Finite Temperature
• Mid-Rapidity Direct-Photon Production in p+p Collisions at sqrt(s) = 200 GeV
• Dimuon transverse momentum spectra as a tool to characterize the emission region in heavy-ion collisions
• Production of energetic dileptons with small invariant masses from the quark-gluon plasma
• What have we learned and want to learn from heavy ion collisions at CERN SPS?
• What Thermodynamics tells about QCD Plasma near Phase Transition
• Electromagnetic Radiation from Hot and Dense Hadronic Matter
• Duality and Chiral Restoration from Low-Mass Dileptons at the CERN-SpS
• A unique large thermal source of real and virtual photons in the reactions Pb(158 AGeV) + Pb, Au
• Quark Gluon Plasma Diagnostics in a Successive Equilibrium Scenario
• Thermal Radiation from Au + Au Collisions at \sqrt{s} = 200 GEV/A Energy
• Rate of photon production from hot hadronic matter
• Spectral Red-Shift Versus Broadening from Photon and Dilepton Spectra
• Space-time evolution of ultra-relativistic heavy ion collisions and hadronic spectra

Cited by in corpus (5)

• Production of large transverse momentum dileptons and photons in $pp$, $dA$ and $AA$ collisions by photoproduction processes
• Radial Flow from Electromagnetic Probes and Signal of Quark Gluon Plasma
• Measuring radial flow of partonic and hadronic phases in relativistic heavy ion collision
• 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
• Thermal photons to dileptons ratio at LHC