The Glasma, Photons and the Implications of Anisotropy

Abstract

We introduce distribution functions for quarks and gluons in the Glasma and discuss how they satisfy various relationships of statistical physics. We use these distributions to compute photon production in the early stages of heavy ion collisions. Photon rates satisfy geometric scaling, that is, the emission rate per unit area scales as a function of the saturation momenta divided by the transverse momentum of the photon. Photon distributions from the Glasma are steeper than those computed in the Thermalized Quark Gluon Plasma (TQGP). Both the delayed equilibration of the Glasma and a possible anisotropy in the pressure lead to slower expansion and mean times of photon emission of fixed energy are increased. This delayed emission might allow for larger photon elliptic flow.

arXiv comment17 pages, 4 figures

References in corpus (26)

• Parton distributions for the LHC
• Collective Modes of an Anisotropic Quark-Gluon Plasma
• Dissipative Dynamics of Highly Anisotropic Systems
• Collective modes of an Anisotropic Quark-Gluon Plasma II
• Turbulent thermalization process in heavy-ion collisions at ultrarelativistic energies
• Universal attractor in a highly occupied non-Abelian plasma
• Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
• Pressure isotropization in high energy heavy ion collisions
• Bose--Einstein Condensation and Thermalization of the Quark Gluon Plasma
• Thermalization in Weakly Coupled Nonabelian Plasmas
• 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
• Measurement of Direct-Photon Elliptic Flow in Pb-Pb Collisions at sqrt(NN) = 2.76 TeV
• Electromagnetic radiation from nuclear collisions at RHIC energies
• Photon production from an anisotropic quark-gluon plasma
• QGP formation time and direct photons from heavy ion collisions
• Anisotropic flow of thermal photons as a quark-gluon plasma viscometer
• Constraining relativistic viscous hydrodynamical evolution
• Photon elliptic flow in relativistic heavy-ion collisions: hadronic versus partonic sources
• Production of Photons and Dileptons in the Glasma
• Geometrical Scaling of Direct-Photon Production in Hadron Collisions from RHIC to the LHC
• Direct photon production from hadronic sources in high-energy heavy-ion collisions
• Constraining the onset of viscous hydrodynamics
• The discovery of gluon-dominant system in heavy ion collisions ---- the large elliptic flow of direct photons

Cited by in corpus (57)

• The production of photons in relativistic heavy-ion collisions
• New theories of relativistic hydrodynamics in the LHC era
• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• Azimuthally anisotropic emission of low-momentum direct photons in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• 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
• Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions
• Coupling hydrodynamics to nonequilibrium degrees of freedom in strongly interacting quark-gluon plasma
• Direct real photons in relativistic heavy ion collisions
• Parametric estimate of the relative photon yields from the Glasma and the Quark-Gluon Plasma in heavy-ion collisions
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
• Ellipticity of photon emission from strongly magnetized hot QCD plasma
• Thermalization of gluons with Bose-Einstein condensation
• Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions
• Dilepton and photon production in the presence of a nontrivial Polyakov loop
• Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
• Holographic Photon Production in Heavy Ion Collisions
• A Tale of Tails: Photon Rates and Flow in Ultra-Relativistic Heavy Ion Collisions
• Photon from the annihilation process with CGC in the $pA$ collision
• Prompt, pre-equilibrium, and thermal photons in relativistic nuclear collisions
• Nonprompt direct-photon production in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Anisotropic flow of thermal photons at RHIC and LHC
• Phenomenology of photon and di-lepton production in relativistic nuclear collisions
• Centrality dependence of photon yield and elliptic flow from gluon fusion and splitting induced by magnetic fields in relativistic heavy-ion collisions
• Gluon polarization tensor in a magnetized medium: Analytic approach starting from the sum over Landau levels
• Thermal photons as a sensitive probe of $\alpha$-cluster in C+Au collisions at the BNL Relativistic Heavy Ion Collider
• Electromagnetic currents induced by color fields
• Spectra and elliptic flow of thermal photons from full overlap U+U collisions at RHIC
• 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
• Quark self-energy in an ellipsoidally anisotropic quark-gluon plasma
• Photons from thermalizing matter in heavy ion collisions
• Anisotropic photon emission from gluon fusion and splitting in a strong magnetic background I: The two-gluon one-photon vertex
• Chiral symmetry breaking and confinement effects on dilepton and photon production around $T_c$
• Electromagnetic fingerprints of the Little Bang
• Directed flow of photons in Cu+Au collisions at RHIC
• Effect of initial-state nucleon shadowing on the elliptic flow of thermal photons
• Recent developments in the theory of electromagnetic probes in relativistic heavy-ion collisions
• Effective distributions of quasi-particles for thermal photons
• Photon radiation in hot nuclear matter by means of chiral anomalies
• Direct Photons in Hydrodynamic Modeling of Relativistic Nuclear Collisions
• Ratio of photon anisotropic flow in relativistic heavy ion collisions
• Scaling properties of direct photon yields in heavy ion collisions
• Production and anisotropic flow of thermal photons in collision of $\alpha$-clustered carbon with heavy nuclei at relativistic energies
• Glueballs and vector mesons at NICA
• Thermalization of the world's smallest fluids: recent developments
• Shear Viscosities of Photons in Strongly Coupled Plasmas
• Photons production in heavy-ion collisions as a signal of deconfinement phase
• Photon and dilepton emission anisotropy for a magnetized quark-gluon plasma
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• Strongly interacting matter in extreme magnetic fields
• Classicalization and unitarization of wee partons in QCD and Gravity: The CGC-Black Hole correspondence
• Two-gluon one-photon vertex in a magnetic field and its explicit one-loop approximation in the intermediate field strength regime
• Impact of residual contamination on inclusive and direct photon flow
• The Extraordinary Glow
• Prompt photon yield and $v_2$ coefficient from gluon fusion induced by magnetic field in heavy-ion collision
• A background for thermal photons in heavy ion collisions