Search For the Origin of the Away-side Double-humped Structure of jets in Heavy Ion Collisions

Abstract

A model is constructed for the origin of the double-humped structure found in the di-hahron azimuthal correlation on the away-side in heavy ion collisions. The parameters in the model are determined by fitting $\Delta \varphi$ azimuthal distribution in central Au+Au collisions at RHIC given by STAR collaboration when the trigger momentum is in $3-4GeV/c$ and the associated particle momentum is in $1.3-1.8GeV/c$. Then we apply our model to the semi-central and peripheral Au+Au collisions at RHIC and the responding $△\varphi$ azimuthal distribution are reproduced respectively. Our results show that the transverse flow effect plays an essential role in the experimentally observed di-hadron azimuthal distribution structure. The spread of the hard parton creation point and initial moving direction is also necessary for the double-humped structure.

Comments: 4 pages in revtex, 2 colored figures