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arXiv 0907.0024nucl-ex
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在$\sqrt{s_{NN}}=200$ GeV上测量Au + Au碰撞中高$p_T$下$π^0$产生的方位向各向异性

PHENIX Measurements of Azimuthal Anisotropy for $π^0$ Production at High $p_T$ in Au+Au Collisions at $\sqrt{s_{NN}}=200$GeV

Rui Wei

摘要:

提出了一种改进的$v_2$的测量方法,用于在$p_T$和中心性的宽范围内测量$π^0$。通过结合$v_2$与$R_{AA}$,我们提供了新的见解射流介质相互作用。我们发现,目前的pQCD能量损失模型不能描述的抑制的$π^0$作为相对于反应平面的角度的函数。我们的结果可以帮助解决的因素4之间的预测传输系数的模型。或者,它可能表明,与强耦合QGP相关的非微扰效应是重要的,需要新的理论发展来充分理解射流介质的相互作用。

英文摘要:

An improved measurement of $v_2$ for $π^0$ in a broad range of $p_T$ and centrality is presented. By combining $v_2$ with the $R_{AA}$, we provide new insights on jet-medium interactions. We show that current pQCD energy loss models cannot describe the suppression of the $π^0$ as a function of the angle with respect to the reaction plane. Our result could help to resolve the factor of 4 differences in the predicted transport coefficients among these models. Alternatively, it may suggest that non-perturbative effects associated with the strongly coupled QGP are important, and new theoretical developments are needed to fully understand the jet medium interactions.

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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