System size dependence of associated yields in hadron-triggered jets

Details System size dependence of associated yields in hadron-triggered jets System size dependence of associated yields in hadron-triggered jets

2009-04-10

arxiv.org/abs/0904.1722v1

Phys.Lett.B683:123-128,2010

Physics

Nuclear Physics

Nuclear Experiment

12 pages, 5 figures

Scientific paper

10.1016/j.physletb.2009.12.020

We present results on the system size dependence of high transverse momentum di-hadron correlations at $\sqrt{s_{NN}}$ = 200 GeV as measured by STAR at RHIC. Measurements in d+Au, Cu+Cu and Au+Au collisions reveal similar jet-like correlation yields at small angular separation ($\Delta\phi\sim0$, $\Delta\eta\sim0$) for all systems and centralities. Previous measurements have shown that the away-side yield is suppressed in heavy-ion collisions. We present measurements of the away-side suppression as a function of transverse momentum and centrality in Cu+Cu and Au+Au collisions. The suppression is found to be similar in Cu+Cu and Au+Au collisions at a similar number of participants. The results are compared to theoretical calculations based on the parton quenching model and the modified fragmentation model. The observed differences between data and theory indicate that the correlated yields presented here will provide important constraints on medium density profile and energy loss model parameters.

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