The "soft ridge" -- is it initial-state geometry or modified jets?


An η\eta-elongated same-side 2D peak ("soft ridge") in minimum-bias angular correlations from heavy ion collisions has been attributed both to jet formation and to initial-state geometry structure coupled to radial flow. We consider evidence for both interpretations.Comment: 4 pages, 3 figures, to be published in the Proceedings of the XLI International Symposium on Multiparticle Dynamics (ISMD 2011), 26-30 September, 2011, Miyajima Island, Hiroshima, Japa

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