Abstract: Connection between near- and away-side medium response: the roles of two particle correlation induced by quenched jets

A detailed survey of the landscape of the dihadron correlations have been performed recently by the PHENIX Collaboration. The data suggest that the medium response contribution, reflected by a away-side mach-cone structure in $Deltaphi$ and a near-side ridge structure in $Deltaeta$, dominates over the jet fragmentation up to 4 GeV/$c$ in both trigger and partner transverse momentum ($p_T$). In most correlation analyses, the intermediate $p_T$ pairs are assumed to come mainly from jet-medium pair. In this picture, the trigger comes from a jet that is surface biased, which losses a fraction of its energy and then fragments outside medium. The partners from the fragmentation of same jet contribute to the near-side jet peak, while those from feedback of the lost energy lead to the near-side ridge. In parallel, the away-side jet is absorbed by the medium, contributing to the mach-cone structure at the away-side $Deltaphi$ distribution. This picture ignores the fact that a large fraction of the triggers may come from medium response. In this talk, we evaluate the possible role of pairs where both trigger and partner comes from medium response (medium-medium pair) in dihadron correlation. Through a model calculation incorporating both jet absorption and medium response, we show that these pairs may dominate the dihadron yield at intermediate $p_T$, and may be responsible for both the near-side ridge and away-side mach-cone structure. Hence it provide a natural explanation for the similarity between the near- and away-side pairs.