标题： 从RHIC到LHC的夸克-介质相互作用系统学 显示英文标题

标题： Systematics of parton-medium interaction from RHIC to LHC

摘要： 尽管在重离子碰撞中的高-P_T过程有大量实验数据，但区分硬部分子-介质相互作用的不同模型一直很困难。 一个关键原因是，在RHIC处的pQCD部分子谱下降得非常陡峭，以至于即使区分部分子能量的中等变化与完全部分子吸收也是几乎不可能的。 本质上，能量损失模型只能在零能量损失附近被有效探测，因此在RHIC能量下，只有能量损失的路径长度依赖性提供了某些区分能力。 然而在LHC情况下，这种情况不再存在：由于来自2.76 AGeV碰撞的部分子p_T谱形状要平缓得多，可用的数据深入探测了模型的动力学。 因此，同时拟合RHIC和LHC能量下的核抑制具有很大的潜力，可以区分那些单独对RHIC数据描述同样良好的不同模型。 显示英文摘要

摘要： Despite a wealth of experimental data for high-P_T processes in heavy-ion collisions, discriminating between different models of hard parton-medium interactions has been difficult. A key reason is that the pQCD parton spectrum at RHIC is falling so steeply that distinguishing even a moderate shift in parton energy from complete parton absorption is essentially impossible. In essence, energy loss models are effectively only probed in the vicinity of zero energy loss and, as a result, at RHIC energies only the pathlength dependence of energy loss offers some discriminating power. At LHC however, this is no longer the case: Due to the much flatter shape of the parton p_T spectra originating from 2.76 AGeV collisions, the available data probe much deeper into the model dynamics. A simultaneous fit of the nuclear suppression at both RHIC and LHC energies thus has great potential for discriminating between various models that yield equally good descriptions of RHIC data alone.