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arXiv 1209.4941nucl-exhep-ex
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$Δη$ - $Δϕ$相关性和STAR中的脊结构

$Δη$-$Δϕ$ correlations and the ridge structure in STAR

L. Chanaka De Silva

摘要:

利用STAR中$\sqrt{S_{NN}}$ = 200 GeV的中心Au+Au碰撞进行的触发双强子关联研究揭示了高$p_{T}$粒子的一种新的二维脊状结构($Δη$,$Δϕ$)。一个类似的结构也存在于一个包容性的非触发双强子相关分析。我们< $p_{T}$ >通过增加两种带电粒子的较低$p_{T}$接受度来研究双强子关联的演化。一个平滑的数据的演变观察和我们的结果再现触发分析结构< p_{T} >= 2.7 GeV/c附近。我们量化的相关结构的演化通过拟合模型函数。模型函数通过使用高次谐波模型分量$v_{n}$(n= 1,2,3,4,5)和通过非对称2d高斯建模的余数来强调可能的初始状态波动贡献。提取的参数进行比较,模型预测和p+p数据在$\sqrt{S_{NN}}$ = 200 GeV和可能的起源的近侧结构进行了讨论。

英文摘要:

Triggered di-hadron correlation studies using central Au+Au collisions at $\sqrt{S_{NN}}$ = 200 GeV in STAR revealed a novel ridge-like structure in two dimensions ($Δη$,$Δϕ$) for high $p_{T}$ particles. A similar structure is also present in an inclusive un-triggered di-hadron correlation analysis. We study the <$p_{T}$> evolution of di-hadron correlations by increasing the lower $p_{T}$ acceptance of both charged particles. A smooth evolution of data is observed and our results reproduce the triggered analysis structure near <p_{T}> = 2.7 GeV/c. We quantify the correlation structure evolution by fitting a model function. The model function emphasizes possible initial state fluctuation contributions via the use of higher harmonic model components $v_{n}$ (n=1,2,3,4,5) and a remainder which is modeled via an asymmetric 2d Gaussian. The extracted parameters are compared to model predictions and p+p data at $\sqrt{S_{NN}}$ = 200 GeV and possible origins of the nearside structure are discussed.

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