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Summary: “Jet quenching” at RHIC

Results I: Leading hadron production in pp, dAu, AuAu @ RHIC:
- - Strong (factor ~5) high pT suppression in central AuAu: pT-, sqrt(s)- dependence consistent with parton energy loss in dense QCD medium (dNg/dy~1100).
- - Reaction-plane dependence of the suppression provides additional constraints to the path-length dependence of the energy loss.

Results II: Jet production in QCD vacuum (pp) & cold QCD medium (dAu):

- Small differences on the extracted properties (jT, kT) of the jets emitted in pp & dAu

- Relatively small initial state effects (multiple scattering) in cold nuclear matter.

Results III: Jet production in a hot & dense QCD medium (AA):

- Away-side disappearance consistent with:

(i) “Mono-jet” predictions due to high-energy parton “absorption” in dense QCD matter. (enhanced suppression following line of longest path).

(ii) Large broadening of di-jet acoplanarity (kT~3 GeV/c) due to multiple scattering of

away-side parton in the medium. (Can we extract a transport coeffic. consistent w/

the observed dNg/dy ? ).

- Unmodified near-side azimuth. jet properties (jT): Vacuum fragm. of unquenched trigger had.

- No strong flavor dependence at intermediate pT observed

- Dihadron eta correlations consistent w/ coupling of g rad. w/ longitud. expand. medium