Jet Correlations at RHIC
Several striking features are observed at RHIC in heavy-ion collisions (but not in d+Au) relative to pp: Large pT hadron yields are suppressed; Leading and sub-leading hadron jet-like back-to-back correlations are suppressed; Leading and soft hadron correlations are enhanced; Baryon to meson ratio is enhanced in the intermediate pT region, and yet the baryons seem to possess jet-like characteristics; And elliptic flow at intermediate to high pT exhibits a pattern suggestive of the relevance of the constituent quark degrees of freedom. These and other observations suggest that jets are modified in the hot and dense medium created in central heavy ion collisions, and the created medium is qualitatively consistent with a strongly coupled Quark-Gluon Plasma.
However, the properties of the created medium are far from being fully understood. What is the degree of thermalization in heavy-ion collisions? How to probe thermalization experimentally? Is the away side correlation data a manifestation of sonic shock waves? If the jets are losing energy, where does the energy go? At what pT are effects from punching through of the away jet observable? What are the production mechanisms for large pT baryons (and mesons)? Is the relevance of the constituent quark degrees of freedom a proof of de-confinement?
This workshop will provide a forum to gather theorists and experimentalists and to stimulate discussions about what the data are telling us about the properties of the medium, what the remaining questions are, and how to address them experimentally and theoretically.
Last Modified: February 5, 2008