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arXiv 0907.0168nucl-exhep-phnucl-th
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在$\sqrt{s_{NN}}=200$ GeV的Au+Au碰撞中抑制$π^0$产额的标度图:与QGP输运性质的联系

Scaling patterns of the suppression of $π^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP

Roy A. Lacey, N. N. Ajitanand, J. M. Alexander, X. Gong, J. Jia, A. Taranenko, Rui Wei

摘要:

利用中性π介子的抑制测量($π^0$)研究了在$\sqrt{s_{NN}}=200$ GeV的Au+Au碰撞中产生的热QCD介质的依赖于路径长度($L$)和横向动量($p_T$)的喷注猝灭模式.观测到的尺度模式显示了预测的趋势,射流介质相互作用占主导地位的辐射能量损失。它们也允许简单的估计的传输系数$\hat{q}$和比的粘度熵密度$η/s$。这些估计表明,短的平均自由程($λ$)在QCD介质中导致流体动力学类流动与一个小的值的$η/s$,也是负责观察到的强抑制。

英文摘要:

Suppression measurements for neutral pions ($π^0$) are used to investigate the predicted path length ($L$) and transverse momentum ($p_T$) dependent jet quenching patterns of the hot QCD medium produced in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. The observed scaling patterns show the predicted trends for jet-medium interactions dominated by radiative energy loss. They also allow simple estimates of the transport coefficient $\hat{q}$ and the ratio of viscosity to entropy density $η/s$. These estimates indicate that the short mean free path ($λ$) in the QCD medium leading to hydrodynamic-like flow with a small value of $η/s$, is also responsible for the strong suppression observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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