Speaker
Mr
George Moschelli
(Wayne State University)
Description
Jet correlation measurements at RHIC show a striking increase in the yield of associated particles in a narrow range in relative azimuthal angle near $\phi\approx 0$. This region of enhanced particle production is called a ridge because it extends over a broad range in relative pseudorapidity. Interestingly, a similar `soft' ridge of enhanced production has been reported for two-particle correlations {\it without} a jet trigger.
We propose a common explanation for these phenomena based on particle production in an early Glasma stage followed by radial flow. We found excellent agreement with the peak amplitude and azimuthal width shown in current Au-Au data in ref. [3]. Here we extend this work to include Cu-Cu systems. Furthermore, to study the contribution of soft correlations to the hard ridge, we explore not only the soft ridge (in the context of [3]) in different $p_t$ ranges, but also correlations of jets with Glasma flux tubes. We find that correlations of thermally produced pairs are a significant contribution to the triggered measurement.
[1] J. Putschke, et al. (STAR Collaboration), Proceedings of QM06; arXiv:nucl-ex/0701074.
[2] M. Daugherity [STAR Collaboration], J. Phys. G35, 104090 (2008).
[3] Sean Gavin, Larry McLerran, and George Moschelli, Phys. Rev. C79, 051902(R) (2009), arXiv:nucl-th/0806.4718.
Authors
Mr
George Moschelli
(Wayne State University)
Dr
Sean Gavin
(Wayne State University)
