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Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC
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abstract
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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Cited by 1 Pith paper
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Direct-photon production in inelastic and high-multiplicity proton-proton collisions at $\sqrt{s} =$ 13 TeV
First measurement of low-pT direct photons in 13 TeV pp collisions, showing a 3.2 sigma signal in inelastic and a 1.9 sigma hint in high-multiplicity events, with yield rising with multiplicity.
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