Hydrodynamic description of direct photon spectra and elliptic flow in Pb+Pb collisions at LHC

Abstract

In high energy heavy ion collisions a new state of matter, the strongly coupled quark gluon plasma is formed that exhibits the similar properties as our Universe had just a couple of microseconds after the Big Bang, hence such collisions are usually referred as Little Bangs. Subsequent investigations showed that the created medium is a nearly perfect fluid whose time evolution can be described by hydrodynamic models. The distribution of the hadrons that are created in the freeze-out after a rapid expansion carry information about the final state. On the other hand, with penetrating probes, e.g., with direct photons, one can model the time evolution of the quark gluon plasma. In this paper, we present a hydrodynamic model that was inspired by an analytical solution of relativistic hydrodynamics, calculate the invariant transverse momentum spectrum and the elliptic flow of direct photons and compare our results to LHC ALICE data to obtain the value of the model parameters. Based on the the results we give an estimation for the initial temperature of the plasma.

2 figures, 11 pages

References in corpus (7)

• The QCD equation of state with dynamical quarks
• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• Multi-messenger heavy-ion collision physics
• Exact solutions of relativistic perfect fluid hydrodynamics for a QCD equation of state
• Universal scaling of the elliptic flow at RHIC
• Measuring initial temperature through photon to dilepton ratio in heavy ion collision
• Describing the Thermal Radiation in $Au+Au$ Collisions at $\sqrt{s_{NN}}=$200 GeV by an Analytic Solution of Relativistic Hydrodynamics