Dependence of Ridge Formation on Trigger Azimuth: Correlated Emission Model

Details Dependence of Ridge Formation on Trigger Azimuth: Correlated Emission Model Dependence of Ridge Formation on Trigger Azimuth: Correlated Emission Model

2008-09-17

arxiv.org/abs/0809.3018v2

Phys.Rev.C79:034901,2009

Physics

Nuclear Physics

Nuclear Theory

11 pages in RevTex with 7 figures

Scientific paper

10.1103/PhysRevC.79.034901

Ridge formation in near-side correlation in heavy-ion collisions is studied in the framework of a phenomenological model, called Correlated Emission Model (CEM). Successive soft emissions due to jet-medium interaction lead to the enhancement of thermal partons which follow the local flow directions. The correlation between the flow direction and the semihard parton direction is the major factor that causes the ridge formation to depend on the trigger direction relative to the reaction plane. With the use of a few parameters we have been able to reproduce the data on the ridge yields as functions of the trigger azimuthal angle for different centralities. An inside-outside asymmetry function is proposed to further probe the characteristics of the azimuthal correlation function. Insights are provided for the understanding of some detailed aspects of the centrality dependence.

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