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“QGP” models vs. data
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Magnitude of Au+Au suppression dense partonic medium:
- High opacities: <n> = L/≈ 3 – 4
- Large initial gluon densities: dNg/dy ~ 800-1200
- " transport coefficients: <q0> ~ 3.5 GeV/fm2
- Radiative energy losses: dE/dx ≈ 0.25 GeV/fm (expand.) ≈ 14 GeV/fm (static)
- Centrality dependence of Au+Au suppression.
- Dissapeareance of away-side dijet angular correlations.
- No quenching in d+Au collisions.
- pT dependence of Au+Au suppression not described in 1st instance:
- Additional nuclear effects needed to "flatten" LPM RAA (probably justified given the d+Au results)
- s dependence of Au+Au suppression clear ?
- no jet quenching observed in Pb+Pb @ SPS with dNg/dy ~ 500 ?
- (usual explanations: short plasma life-time, quark-dominated plasma, very small hard cross-sections: Cronin-effect dominates ...)
- Particle species dependence of Au+Au suppression (“baryon enhancement”) not perturbative !
- Additional final state effects: q recombination (or baryon junctions, ... ?) needed.
Notes: