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arXiv 0709.0157nucl-th
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高能核碰撞中部分子风对粲夸克关联的影响

The effect of partonic wind on charm quark correlations in high-energy nuclear collisions

X. Zhu, N. Xu, P. Zhuang

摘要:

在高能碰撞中,大质量重夸克最初是连续产生的,它们对早期的动力学条件很敏感。高能核碰撞产生的快速膨胀的夸克-胶子等离子体产生的强集体部分子风显著地改变了关联模式。结果,D个$\bar{\rm D}$对的角度关联函数在角度$Δϕ=π$处被抑制。RHIC($\sqrt{s_{NN}}=200$ GeV)碰撞中的热密介质只能模糊初始的背靠背D $\bar {\rm D}$关联,而LHC($\sqrt{s_{NN}}=5500$ GeV)碰撞中的近侧D $\bar{\rm D}$关联则是清晰而强的。

英文摘要:

In high-energy collisions, massive heavy quarks are produced back-to-back initially and they are sensitive to early dynamical conditions. The strong collective partonic wind from the fast expanding quark-gluon plasma created in high-energy nuclear collisions modifies the correlation pattern significantly. As a result, the angular correlation function for D$\bar{\rm D}$ pairs is suppressed at the angle $Δϕ=π$. While the hot and dense medium in collisions at RHIC ($\sqrt{s_{NN}}=200$ GeV) can only smear the initial back-to-back D$\bar {\rm D}$ correlation, a clear and strong near side D$\bar{\rm D}$ correlation is expected at LHC ($\sqrt{s_{NN}}=5500$ GeV).

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