Phenomenology of photon and di-lepton production in relativistic nuclear collisions

Abstract

We discuss the latest theoretical results on direct photon and dilepton production from relativistic heavy-ion collisions. While the dilepton spectra at low invariant mass show in-medium effects like a collisional broadening of the vector meson spectral functions, the dilepton yield at high invariant masses (above 1.1 GeV) is dominated by QGP contributions for central heavy-ion collisions at relativistic energies. The present status of the photon $v_2$ "puzzle" - a large elliptic flow $v_2$ of the direct photons experimentally observed at RHIC and LHC energies - is also addressed. The role of hadronic and partonic sources for the photon spectra and $v_2$ is considered as well as the possibility to subtract the QGP signal from the experimental observables.

arXiv comment8 pages, 4 figures, Proceedings of the XXIV Quark Matter conference, May 19-24 2014, Darmstadt (Germany)

References in corpus (55)

• Photon Emission from Ultrarelativistic Plasmas
• Parton-Hadron-String Dynamics: an off-shell transport approach for relativistic energies
• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Hadronic Production of Thermal Photons
• 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
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Enhancement of low-mass dileptons in heavy-ion collisions
• Parton transport and hadronization from the dynamical quasiparticle point of view
• Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
• Parton-Hadron-String Dynamics at Relativistic Collider Energies
• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• From Kadanoff-Baym dynamics to off-shell parton transport
• Conformal anomaly as a source of soft photons in heavy ion collisions
• Thermal Photons and Collective Flow at the Relativistic Heavy-Ion Collider
• Measurement of Direct Photons in pp and Pb-Pb Collisions with ALICE
• Thermal photons as a quark-gluon plasma thermometer revisited
• Elliptic flow of thermal photons in relativistic nuclear collisions
• Electrical Conductivity of Hot QCD Matter
• NA60 results on thermal dimuons
• Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
• Measurement of Direct-Photon Elliptic Flow in Pb-Pb Collisions at sqrt(NN) = 2.76 TeV
• Pseudo-Critical Enhancement of Thermal Photons in Relativistic Heavy-Ion Collisions
• Viscous photons in relativistic heavy ion collisions
• Centrality dependence of the direct photon yield and elliptic flow in heavy-ion collisions at sqrt(s)=200 GeV
• Anisotropic flow of thermal photons as a quark-gluon plasma viscometer
• Dilepton emission in high-energy heavy-ion collisions with viscous hydrodynamics
• Elliptic flow of thermal photons from event-by-event hydrodynamic model
• The Glasma, Photons and the Implications of Anisotropy
• Thermal Dimuon Yields at NA60
• Analysis of dilepton production in Au+Au collisions at sqrt(s_NN)=200 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Dilepton production in nucleus-nucleus collisions at top SPS energy within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Low mass dilepton production at ultrarelativistic energies
• Photon elliptic flow in relativistic heavy-ion collisions: hadronic versus partonic sources
• Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung
• Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV
• The Magneto-Sono-Luminescence and its signatures in photon and dilepton production in heavy ion collisions
• Latest Results from CERES/NA45
• Direct photon production from hadronic sources in high-energy heavy-ion collisions
• Dimuon radiation at the CERN SPS within a (3+1)d hydrodynamic+cascade model
• The STAR Dilepton Physics Program
• Dilepton production by dynamical quasiparticles in the strongly interacting quark gluon plasma
• Di-lepton production in p+p collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV from STAR
• Event-by-event direct photon anisotropic flow in relativistic heavy-ion collisions
• Properties of Thermal Photons at RHIC and LHC
• Thermal photon anisotropic flow serves as a quark-gluon plasma viscometer
• Non-perturbative finite $T$ broadening of the $\rho$ meson and dilepton emission in heavy ion-collisions
• e+e- Pairs: a clock and a thermometer of heavy ion collisions
• Photons at RHIC: The role of viscosity and of initial state fluctuations
• Dielectron measurements in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
• The low and intermediate mass dilepton and photon results
• Reply to 'Comment on: 'Non-perturbative finite T broadening of the rho meson and dilepton emission in heavy ion-collisions''
• Elliptic flow of thermal photons at midrapidity in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Probing the non-equilibrium dynamics of hot and dense QCD with dileptons
• Dielectron production in 200 GeV p+p and Au+Au collisions at STAR
• Theoretical aspects of photon production in high energy nuclear collisions

Cited by in corpus (12)

• Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions
• Effects of hadronic rescattering on multistrange hadrons in high-energy nuclear collisions
• Parametric estimate of the relative photon yields from the Glasma and the Quark-Gluon Plasma in heavy-ion collisions
• The pion quasiparticle in the low-temperature phase of QCD
• Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
• Dilepton production and elliptic flow from an anisotropic quark-gluon plasma
• Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations
• Photons from thermalizing matter in heavy ion collisions
• The contribution of NLO and LPM corrections to thermal dilepton emission in heavy ion collisions
• Scaling properties of direct photon yields in heavy ion collisions
• Theoretical aspects of photon production in high energy nuclear collisions
• Hadron modification in a dense baryonic matter