arXiv 0904.17222009-04-10nucl-ex

强子触发喷流中伴随产额的系统尺寸依赖性

System size dependence of associated yields in hadron-triggered jets

STAR Collaboration, B. I. Abelev

备注：: 12 pages, 5 figures
发表信息：: Phys.Lett.B683:123-128,2010
DOI：: 10.1016/j.physletb.2009.12.020

摘要：

我们提出的结果的系统尺寸依赖的高横动量双强子关联在$\sqrt{s_{NN}}$ = 200 GeV的测量在RHIC星。在d+Au、Cu+Cu和Au+Au碰撞中的测量揭示了所有系统和中心性在小角间距（$Δϕ\sim0$，$Δη\sim0$）下的类似喷流关联产率。以前的测量表明，在重离子碰撞中，远离侧的产额被抑制。我们目前的测量作为横向动量和中心性的函数在Cu+Cu和Au+Au碰撞的远侧抑制。抑制被发现是类似的Cu+Cu和Au+Au碰撞在类似数量的参与者。结果进行了比较，理论计算的基础上的部分子猝灭模型和修改的碎裂模型。观测到的数据和理论之间的差异表明，这里提出的相关产量将提供重要的约束介质密度分布和能量损失模型参数。

英文摘要：

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 ($Δϕ\sim0$, $Δη\sim0$) 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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