Hagedorn States and Thermalization in Heavy Ion Collisions

Abstract

In recent years, Hagedorn states have been used to explain the equilibrium and transport properties of a hadron gas close to the QCD critical temperature. These massive resonances are shown to lower $\eta /s$ to near the AdS/CFT limit close to the phase transition. A comparison of the Hagedorn model to recent lattice results is made and it is found that the hadrons can reach chemical equilibrium almost immediately, well before the chemical freeze-out temperatures found in thermal fits for a hadron gas without Hagedorn states.

20 pages, 23 figures, Proceedings for XLIX International Winter Meeting on Nuclear Physics 24-28 January 2011 BORMIO, Italy

References in corpus (9)

• The QCD equation of state with dynamical quarks
• Equation of state and QCD transition at finite temperature
• Chemical freeze-out in ultra-relativistic heavy ion collisions at sqrt(s)_NN = 130 and 200 GeV
• The thermodynamics for a hadronic gas of fireballs with internal color structures and chiral fields
• Probing collision dynamics at RHIC
• Centrality Dependence of Chemical Freeze-out in Au+Au Collisions at RHIC
• Universal chemical freeze-out as a phase transition signature
• Why Don't We See the Hagedorn Mass Spectrum in the Experiments?
• Chemical Equilibration at the Hagedorn Temperature