标题： 伽马-喷注断层扫描在高能核碰撞中的夸克-胶子等离子体 显示英文标题

标题： Gamma-Jet Tomography of Quark-Gluon Plasma in High-Energy Nuclear Collisions

摘要： 在下一阶微扰QCD（pQCD）部分子模型中，由于部分子能量损失，与高能$p_{T}$光子相关的远离边强子谱的抑制被证明可以提供RHIC中高能重离子碰撞形成的致密物质的完整断层成像图。 由NLO pQCD中$\gamma$触发喷注谱的形状决定，大$z_T=p_T^{h}/p_T^{\gamma} \stackrel{>}{\sim} 1$的强子谱更容易受到部分子能量损失的影响，因此主要来自$\gamma$触发喷注的表面发射，而小$z_{T}$强子主要来自体积发射中能量减少的喷注的碎片化。 这些导致不同区域的$z_{T}$中强子抑制具有不同的中心性依赖性。 显示英文摘要

摘要： Within the next-to-leading order (NLO) perturbative QCD (pQCD) parton model, suppression of away-side hadron spectra associated with a high $p_{T}$ photon due to parton energy loss is shown to provide a complete tomographic picture of the dense matter formed in high-energy heavy-ion collisions at RHIC. Dictated by the shape of the $\gamma$-triggered jet spectrum in NLO pQCD, hadron spectra at large $z_T=p_T^{h}/p_T^{\gamma} \stackrel{>}{\sim} 1$ are more susceptible to parton energy loss and therefore are dominated by surface emission of $\gamma$-triggered jets, whereas small $z_{T}$ hadrons mainly come from fragmentation of jets with reduced energy from volume emission. These lead to different centrality dependence of the hadron suppression in different regions of $z_{T}$.