Overview/Summary

• 1. Introduction:

• • Goal: Study Quantum Chromo (many-body) Dynamics (QGP, CGC) in high-energy A+A collisions [by comparing to p+A (“cold” QCD medium), p+p (“no medium”)].

• 2. Energy densities:

• • Maximum dET/dη ~ 600 GeV at midrapidity consistent w/ initial ε > 5 GeV/fm3

• 3. Elliptic flow:

• • Strong elliptic flow v2 consistent w/ short thermalization times t0 ~ 1 fm/c

• 4. Soft particle spectra:

• • Shapes & yields consistent w/ hydrodynam. (thermal+coll. velocity) source emission
  • Particles ratios consistent w/ chemical equilibrium before hadronization

• 5. Hard particle spectra:

• • Strong high pT suppression in central A+A (compared to p+p, p+A & pQCD) consistent w/ final-state partonic energy loss in dense system: dNg/dy~1100

• 6. Intermediate pT spectra:

• • Enhanced baryon yields & v2 (compared to meson) consistent w/ quark recombination mechanisms in dense thermal system

• 7. Summary & open questions: “QGP” ? Observations @ lower √s ?

• Future measurements.