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Overview
1. Photon production mechanisms in high-energy A+A collisions:
- Prompt photon (pQCD): TAB-scaled p+p (or NLO) reference
- Thermal photon (Hydro) ® Connection to QCD thermodynamics
2. Hydrodynamical model evolution of A+A reactions:
- Description: 2D+1 ideal fluid, longitud. boost-invariant, cylindrical symm.
- EoS: QGP (ideal gas w/ MIT bag) + HRG + 1st order phase transition.
- Initial conditions: ε0, t0, μB (& centrality dependence)
- End of evolution: Cooper-Frye freeze-out conditions at Tfo
- Comparison to data: Hydro (+ quenched pQCD) vs hadron dN/dpT AuAu @ RHIC
3. Thermal photon production in hydro:
- Photon rates parametrizations: QGP, HRG.
- Comparison to data: Hydro (+ pQCD) vs dNg/dpT in AuAu @ RHIC-200 GeV
4. Thermal g (exponential inverse) slopes ® initial QGP Temperature
5. Thermal g slopes, hadron dN/dη ® T, entropy ® QCD “EoS”
6. Outlook: RHIC(-II) light A+A at lower sqrt(s) ?