Brookhaven National Laboratory


Critical Assessment of Theory and Experiment on Correlations at RHIC

Event Date 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 collisions.

  • The origin of conical emission: Mach cones, QCD Cherenkov radiation, wakes etc.
  • Open issues and assumptions in the proposed theoretical models
  • Uncertainties in the experimental analysis, e.g., ZYAM

Organizing Committee

Jiangyong Jia, Denes Molnar, Peter Petreczky
Robert D. Pisarski, Paul Sorensen, Fuqiang Wang

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Last Modified: February 23, 2009

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