Describing the Thermal Radiation in Collisions at 200 GeV by an Analytic Solution of Relativistic Hydrodynamics
arXiv:2311.03568 · doi:10.1142/S0217751X24500064
Abstract
In high-energy heavy-ion collisions a nearly perfect fluid, the so-called strongly coupled quark gluon plasma forms. After the short period of thermalisation, the evolution of this medium can be described by the laws of relativistic hydrodynamics. The time evolution of the quark gluon plasma can be understood through direct photon spectra measurements, which are sensitive to the entire period between the thermalisation and the freeze-out of the medium. I present a new analytic formula that describes the thermal photon radiation and it is derived from an exact and finite solution of relativistic hydrodynamics with accelerating velocity field. Then I compare my calculations to the most recent nonprompt spectrum of direct photons for at 200 GeV collisions. I have found a convincing agreement between the model and the data, which allows to give an estimate of the initial temperature in the center of the fireball. My results predict hydrodynamic scaling behaviour for the thermal photon spectra of high-energy heavy-ion collisions.
13 pages, 2 figures. This paper is accepted for publication in International Journal of Modern Physics A
References in corpus (7)
- The QCD equation of state with dynamical quarks
- Phobos results on charged particle multiplicity and pseudorapidity distributions in Au+Au, Cu+Cu, d+Au, and p+p collisions at ultra-relativistic energies
- Has the QCD Critical Point been Signaled by Observations at RHIC ?
- Multi-messenger heavy-ion collision physics
- A New Family of Simple Solutions of Perfect Fluid Hydrodynamics
- Detailed description of accelerating, simple solutions of relativistic perfect fluid hydrodynamics
- The Magneto-Sono-Luminescence and its signatures in photon and dilepton production in heavy ion collisions