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.

17 pages, 4 figures

References in corpus (6)

• Parton distributions for the LHC
• Dissipative Dynamics of Highly Anisotropic Systems
• Electromagnetic radiation from nuclear collisions at RHIC energies
• Photon production from an anisotropic quark-gluon plasma
• Constraining relativistic viscous hydrodynamical evolution
• Direct photon production from hadronic sources in high-energy heavy-ion collisions

Cited by in corpus (20)

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• Thermalization of gluons with Bose-Einstein condensation
• Nonprompt direct-photon production in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Gluon polarization tensor in a magnetized medium: Analytic approach starting from the sum over Landau levels
• Phenomenology of photon and di-lepton production in relativistic nuclear collisions
• Quark self-energy in an ellipsoidally anisotropic quark-gluon plasma
• Anisotropic photon emission from gluon fusion and splitting in a strong magnetic background I: The two-gluon one-photon vertex
• Ratio of photon anisotropic flow in relativistic heavy ion collisions
• Photon radiation in hot nuclear matter by means of chiral anomalies
• Direct Photons in Hydrodynamic Modeling of Relativistic Nuclear Collisions
• Production and anisotropic flow of thermal photons in collision of $\alpha$-clustered carbon with heavy nuclei at relativistic energies
• Thermalization of the world's smallest fluids: recent developments
• Photon and dilepton emission anisotropy for a magnetized quark-gluon plasma
• Photons production in heavy-ion collisions as a signal of deconfinement phase
• 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
• The Extraordinary Glow
• A background for thermal photons in heavy ion collisions