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Advances in High Energy Physics
Volume 2013 (2013), Article ID 728365, 11 pages
Research Article

Ridge and Transverse Correlation without Long-Range Longitudinal Correlation

1Center for Particles and Fields and Department of Physics, University of Texas at Austin, Austin, TX 78712, USA
2Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, OR 97403-5203, USA

Received 19 March 2013; Accepted 16 May 2013

Academic Editor: Jan E. Alam

Copyright © 2013 Charles B. Chiu and Rudolph C. Hwa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A simple phenomenological relationship between the ridge distribution in and the single-particle distribution in can be established from the PHOBOS data on both distributions. The implication points to the possibility that it is not necessary to have long-range longitudinal correlation to explain the data. An interpretation of the relationship is then developed, based on the recognition that longitudinal uncertainty of the initial configuration allows for non-Hubble-like expansion at early time. It is shown that the main features of the ridge structure can be explained in a model where transverse correlation stimulated by semihard partons is the principal mechanism. This work is related to the azimuthal anisotropy generated by minijets in Au-Au collisions at 0.2 TeV on the one hand and to the ridge structure seen in collisions at 7 TeV on the other hand.