Prompt, pre-equilibrium, and thermal photons in relativistic nuclear collisions

Abstract

The direct photon emission model in relativistic nuclear colliders has been improved in recent years for reducing the discrepancy between theoretical estimations and experimental data and for understanding the properties of the QCD matter. In this study, the contribution of pre-equilibrium photons are investigated in addition to those of prompt and thermal photons in the framework of a relativistic hydrodynamic model. The numerical simulations at an LHC energy suggest that the pre-equilibrium photons may be relevant at intermediate transverse momentum near the saturation momentum scale, increasing particle spectra and reducing elliptic flow of direct photons.

arXiv comment16 pages, 6 figures; revised version to appear in Journal of Physics G: Nuclear and Particle Physics

References in corpus (73)

• Computing Quark and Gluon Distribution Functions for Very Large Nuclei
• Glauber Modeling in High Energy Nuclear Collisions
• Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum
• The equation of state in (2+1)-flavor QCD
• Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction
• Full result for the QCD equation of state with 2+1 flavors
• The Color Glass Condensate
• Bottom-up thermalization in heavy ion collisions
• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• The production of photons in relativistic heavy-ion collisions
• Hadronic Production of Thermal Photons
• Creating small circular, elliptical, and triangular droplets of quark-gluon plasma
• pQCD-based Approach to Parton Production and Equilibration in High-Energy Nuclear Collisions
• One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $\sqrt{s}=5.02$ TeV
• Direct photon production in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$ = 2.76 TeV
• Turbulent thermalization process in heavy-ion collisions at ultrarelativistic energies
• Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
• Bose--Einstein Condensation and Thermalization of the Quark Gluon Plasma
• Conformal anomaly as a source of soft photons in heavy ion collisions
• Net baryon diffusion in fluid dynamic simulations of relativistic 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
• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Elliptic flow of thermal photons in relativistic nuclear collisions
• Equation of state at finite densities for QCD matter in nuclear collisions
• Universality far from equilibrium: From superfluid Bose gases to heavy-ion collisions
• Collectivity and electromagnetic radiation in small systems
• Azimuthally anisotropic emission of low-momentum direct photons in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• The Boltzmann equation for gluons at early times after a heavy ion collision
• Pseudo-Critical Enhancement of Thermal Photons in Relativistic Heavy-Ion Collisions
• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• QGP formation time and direct photons from heavy ion collisions
• Viscous photons in relativistic heavy ion collisions
• Hierarchy of azimuthal anisotropy harmonics in collisions of small systems from the Color Glass Condensate
• Electromagnetic radiation by quark-gluon plasma in magnetic field
• Centrality dependence of the direct photon yield and elliptic flow in heavy-ion collisions at sqrt(s)=200 GeV
• Quark production, Bose-Einstein condensates and thermalization of the quark-gluon plasma
• Fermion production from real-time lattice gauge theory in the classical-statistical regime
• Azimuthal Asymmetry of Direct Photons in High Energy Nuclear Collisions
• The Glasma, Photons and the Implications of Anisotropy
• Parametric estimate of the relative photon yields from the Glasma and the Quark-Gluon Plasma in heavy-ion collisions
• Elliptic flow from thermal photons with magnetic field in holography
• Probing gluon saturation with next-to-leading order photon production at central rapidities in proton-nucleus collisions
• Thermal photon $v_2$ with slow quark chemical equilibration
• Elliptic flow of thermal photons and formation time of quark gluon plasma at RHIC
• Production of Photons and Dileptons in the Glasma
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Universal Parametrization of Thermal Photon Rates in Hadronic Matter
• Enhancement of thermal photon production in event-by-event hydrodynamics
• Nonequilibrium fixed points in longitudinally expanding scalar theories: infrared cascade, Bose condensation and a challenge for kinetic theory
• Dissipative Hydrodynamic Effects on Baryon Stopping
• Photon production from non-equilibrium QGP in heavy ion collisions
• The Exact Evolution Equation of the Curvature Perturbation for Closed Universe
• Constraining unintegrated gluon distributions from inclusive photon production in proton-proton collisions at the LHC
• Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions
• Photons from the Early Stages of Relativistic Heavy Ion Collisions
• A Tale of Tails: Photon Rates and Flow in Ultra-Relativistic Heavy Ion Collisions
• Holographic Photon Production in Heavy Ion Collisions
• Thermal photon emission from the pi-rho-omega system
• Dilepton production and elliptic flow from an anisotropic quark-gluon plasma
• Electromagnetic probes of a pure-glue initial state in nucleus-nucleus collisions at energies available at the CERN Large Hadron Collider
• Effective kinetic description of the expanding overoccupied Glasma
• Photon from the annihilation process with CGC in the $pA$ collision
• Probing the early-time dynamics of relativistic heavy-ion collisions with electromagnetic radiation
• Benchmarking a Non-Equilibrium Approach to Photon Emission in Relativistic Heavy-Ion Collisions
• Hybrid model calculations of direct photons in high-energy nuclear collisions
• Landau and Eckart frames for relativistic fluids in nuclear collisions
• Anisotropy of Low Energy Direct Photons in Relativistic Heavy Ion Collisions
• Quark self-energy in an ellipsoidally anisotropic quark-gluon plasma
• Photons from thermalizing matter in heavy ion collisions
• Off-equilibrium corrections to energy and conserved charge densities in the relativistic fluid in heavy-ion collisions
• Effective distributions of quasi-particles for thermal photons

Cited by in corpus (11)

• Multi-messenger heavy-ion collision physics
• The Present and Future of QCD
• Photon production and elliptic flow from momentum-anisotropic quark-gluon plasma
• Probing the evolution of heavy-ion collisions using direct photon interferometry
• Anisotropic photon emission from gluon fusion and splitting in a strong magnetic background I: The two-gluon one-photon vertex
• Radiative hadronization: Photon emission at hadronization from quark-gluon plasma
• Direct Photons in Hydrodynamic Modeling of Relativistic Nuclear Collisions
• Influence of magnetic field-induced anisotropic gluon pressure during pre-equilibrium in heavy-ion collisions: A faster road towards isotropization
• Bremsstrahlung photon from a hadronizing quark-gluon plasma
• Two-gluon one-photon vertex in a magnetic field and its explicit one-loop approximation in the intermediate field strength regime
• Hydrodynamic model of heavy-ion collisions with low momentum components