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Initial State Fluctuations and Final-State

Particle Correlations

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Experimental data on two-particle correlations have revealed a long range pseudo-rapidity correlation in heavy-ion collisions, called the "ridge". The ridge is present whether a high transverse momentum (pt) trigger particle is required or not. The basic principle of causality and the approximate correspondence of pseudo-rapidity and space-time rapidity require that such long-range correlations originate from the initial stage of the collision.

In addition, two-particle correlations with a high pt trigger particle exhibit a broadened and double-peaked structure on the away side in heavy-ion collisions, in contrast to observations in p+p collisions exhibiting di-jet peaks. Three-particle correlations suggest that the away-side double-peak correlation is due to conical emission of correlated hadrons.

Various theoretical explanations for the long-range correlations have been put forward; most notably, the formation of approximately boost invariant color flux tubes. To explain the ridge, transverse hydrodynamic flow is required. On the other hand, Mach-cone shock waves have been proposed to explain the conical emission on the away side.

More recently, there have been suggestions that initial-state geometry fluctuations may have significant effects on final-state particle correlations. For example, initial energy density fluctuations are shown, after hydrodynamic evolution, to give rise to features in two-particle correlations that may be qualitatively consistent with data. Fluctuations in the overlap geometry of participating nucleons can give rise to higher moments of the flow; a large “triangular flow” can yield features like the near-side ridge and away-side double-peak in the two-particle correlations.

The purpose of this workshop is to bring together experts, both theorists and experimentalists, to examine all aspects of experimental data and current theoretical approaches, on both pt-triggered and un-triggered particle correlations. Among the questions to be addressed by the workshop are:

Proceedings Information for Speakers

All speakers are to submit a 6-page Proceedings Package consisting of:

The Proceedings Package must be submitted prior to or during the workshop. A paper copy is preferable; however, an electronic copy may be submitted to pesposit@bnl.gov. Please avoid using color since the proceedings are printed in black and white.

Your cooperation is appreciated for timely publication of the proceedings after the workshop. Any questions contact the event coordinator at 631-344-3097 or pesposit@bnl.gov.


Limited on-site housing is available which will be assigned on a first-come, first-served basis. The event coordinator will make on-site housing reservations for all visitors according to the arrival and departure dates listed on their registration form. Visitors will be contacted by the event coordinator regarding confirmation information.

Organizing Committee

Last Modified: November 10, 2010