Abstract
Angular correlations measured in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) include a same-side (SS) 2D peak that is elongated on pseudorapidity η in more-central Au–Au collisions. The elongated SS peak has been referred to as a ‘soft ridge’. The SS peak is consistent with expected jet correlations in peripheral A–A and p–p collisions. A saturation-scale argument has been proposed to explain the origin of the elongated SS peak in terms of correlations from glasma flux tubes interacting with radial flow. In this analysis we review the details of the proposed argument in comparison to perturbative QCD predictions of jet yields and correlations. We find that the proposal is inconsistent with several features of measured spectra and correlations.
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