Direct photons from relativistic heavy-ion collisions

Abstract

We recall the seminal developments in the study of radiation of direct photons from relativistic heavy ion collisions, which have helped to enhance the scope of single photons as a probe of the quark gluon plasma considerably. There is a mounting evidence that in addition to providing information about the initial temperature of the plasma as envisaged originally, these radiations measure the momentum anisotropy of the deconfined quarks and gluons, energy loss of the quarks, the initial spatial asymmetry of the plasma, and the history of evolution of the system. After a brief description of the theoretical developments and results for direct photons at SPS energies, we discuss the expectations and findings at RHIC.

Invited Plenary Talk at Quark Matter 2008, Jaipur, India. 10 pages, 7 eps figures

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Cited by in corpus (23)

• Tomography of high-energy nuclear collisions with photon-hadron correlations
• Elliptic flow of thermal photons from event-by-event hydrodynamic model
• D-mesons and charmonium states in hot isospin asymmetric strange hadronic matter
• Enhancement of thermal photon production in event-by-event hydrodynamics
• Collision centrality and ${\tau }_0$ dependence of the emission of thermal photons from fluctuating initial state in ideal hydrodynamic calculation
• Thermal photons in QGP and non-ideal effects
• Anisotropic flow of thermal photons at RHIC and LHC
• $\gamma$-hadron spectra in p + Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Thermal photons as a sensitive probe of $\alpha$-cluster in C+Au collisions at the BNL Relativistic Heavy Ion Collider
• Electromagnetic probes
• Spectra and elliptic flow of thermal photons from full overlap U+U collisions at RHIC
• Triangular flow of thermal photons from an event-by-event hydrodynamic model for 2.76A TeV Pb+Pb collisions at LHC
• Photon production from Pb+Pb collisions at {$\sqrt{s_{\mathrm{NN}}}$} = 5.02 TeV at LHC and at {$\sqrt{s_{\mathrm{NN}}}$} = 39 TeV at FCC
• Single photons from relativistic collision of lead nuclei at CERN SPS: A reanalysis
• Directed flow of photons in Cu+Au collisions at RHIC
• Effect of initial-state nucleon shadowing on the elliptic flow of thermal photons
• Ratio of photon anisotropic flow in relativistic heavy ion collisions
• Production and anisotropic flow of thermal photons in collision of $\alpha$-clustered carbon with heavy nuclei at relativistic energies
• Gamma-Jet Tomography of Quark-Gluon Plasma in High-Energy Nuclear Collisions
• Search and study of Quark Gluon Plasma at the CERN-LHC
• Direct photon production in d+A and A+A collisions at RHIC
• A Reanalysis of Single Photon Data at CERN SPS
• Thermal dileptons in high-energy nuclear collisions