Pedestal and Peak Structure in Jet Correlation

Details Pedestal and Peak Structure in Jet Correlation Pedestal and Peak Structure in Jet Correlation

2005-05-04

arxiv.org/abs/nucl-th/0505014v1

Phys.Rev. C72 (2005) 034903

Physics

Nuclear Physics

Nuclear Theory

14 pages in LaTex and 2 figures in eps

Scientific paper

10.1103/PhysRevC.72.034903

We study the characteristics of correlation between particles in jets produced in heavy-ion collisions. In the framework of parton recombination we calculate the $\eta$ and $\phi$ distributions of a pion associated with a trigger particle. The origin of the pedestal in $\Delta\eta$ is related to the longitudinal expansion of the thermal partons that are enhanced by the energy loss of hard partons traversing the bulk medium. The peaks in $\Delta\eta$ and $\Delta\phi$ are related to the same angular spread of the shower partons in a jet cone. No artificial short- or long-range correlations are put in by hand. A large part of the correlation between hadrons in jets is due to the correlation among the shower partons arising from momentum conservation. Recombination between thermal and shower partons dominates the correlation characterisitics in the intermediate $p_T$ region.

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