Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC

Details Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC

2005-03-21

arxiv.org/abs/nucl-th/0503054v3

Eur.Phys.J.C46:451-464,2006

Physics

Nuclear Physics

Nuclear Theory

Version to appear in EPJ-C (extended discussion and refs. and a few corrections)

Scientific paper

10.1140/epjc/s2006-02504-0

Thermal photon production at mid-rapidity in Au+Au reactions at $\sqrt{s_{NN}}$ = 200 GeV is studied in the framework of a 2D+1 hydrodynamical model that describes efficiently the bulk identified hadron spectra at RHIC. The combined thermal plus NLO pQCD photon spectrum is in good agreement with the yields measured by the PHENIX experiment for all Au+Au centralities. Within our model, we demonstrate that the correlation of the thermal photon slopes with the charged hadron multiplicity in each centrality bin provides direct empirical information on the underlying degrees of freedom and on the equation of state, $s(T)/T^3$, of the strongly interacting matter.

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