Critical Assessment of Theory and Experiment on Correlations at RHIC
Main Meeting Location
|February 25-26, 2009
Brookhaven National Laboratory
Physics Building, Bldg 510, Large Seminar Room
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Experiments at RHIC have observed two- and three-particle correlation
patterns unique to heavy ion collisions. Understanding their origin may
provide crucial insights into collective phenomena and transport properties
of the medium. For example, correlations between particles with high
transverse momentum exhibit a peak on the away-side that is shifted from its
expected position at 180 degrees.
Several possible correlation mechanisms have been proposed, such as
hydrodynamics (Mach cone), chromo-dielectric response to a fast particle
moving in the medium (Cherenkov radiation), coupling between brehmstrahlung
and flow (jet deflection), and effects of statistical momentum conservation.
Determining which, if any, of these scenarios provides the correct
explanation of the data may tell us something about the equation of state
(the speed of sound), transport properties (shear viscosity), or the
existence of novel elementary excitations of the matter produced. Apart from
the theoretical issues there are also experimental uncertainties to be
addressed: e.g., the effect of assuming zero correlation yield at minimum (ZYAM)
on the interpretation of the data.
The focus of the proposed workshop will be correlations on the away side in
azimuth (back-to-back) and their modifications by the medium in Au+Au
- The origin of conical emission: Mach cones, QCD Cherenkov radiation,
- Open issues and assumptions in the proposed theoretical models
- Uncertainties in the experimental analysis, e.g., ZYAM
Robert D. Pisarski,
Last Modified: February 23, 2009