Jet Quenching in Dense Matter
Jet Quenching in Dense Matter
复制标题
DOI：
10.1016/0370-2693(90)91409-5
复制
发表时间：
1990-07
影响因子：
4.4
通讯作者：
M. Gyulassy;M. Plümer
中科院分区：
文献类型：
--
作者：
M. Gyulassy;M. Plümer
本文计算了超相对论核碰撞中硬喷注的猝灭，着重讨论了它对夸克胶子等离子体中能量损失机制可能变化的敏感性，计算了超相对论核碰撞中硬喷注产生的衰减，并考虑了它对致密物质中能量损失机制dE/dx变化的敏感性。特别是，我们考虑的dE/dx附近的夸克胶子等离子体相变温度可能突然下降的后果。我们发现，这样的变化降低淬火速率与增加A，并可能在有利的条件下导致该过渡的签名之一。在任何情况下，硬喷流提供了一个强大的”外部”探测器的瞬态致密物质产生的反应，因为他们的生产率是计算与微扰QCD [1]到一个缓慢变化的校正因子J {rv 2。主要的困难是，这些速率非常小，并且大的软射流和小型射流背景波动[2，3]可能使它们的检测复杂化。以前对核碰撞的喷流计算[4，5，6]认为喷流的增强共面性是致密物质中多重散射的一种探测。不幸的是，正如[5，6]中所强调的，预计在致密物质的受限相和去受限相都会发生增加的共面性。另一方面，dE/dx随着密度的增加而减小是一种新的效应，只有在非常高的密度下夸克相互作用的性质发生剧烈变化时才会发生这种效应。虽然我们不能证明，这样的减少是必然与量子色动力学去限制过渡，我们激励这种可能性，通过审查最近的晶格“数据”，并显示，辐射能量损失被抑制高能量射流。喷流衰减因子，然后计算变化慷慨dE/dx，并考虑到大的不确定性，在超相对论性核碰撞的时间演化。
The quenching of hard jets in ultrarelativistic nuclear collisions is estimated emphasizing its sensitivity to possible changes in the energy loss mechanism in a quark gluon plasma.We calculate the attenuation of hard jet production in ultra-relativistic nuclear collisions and consider its sensitivity to changes in the energy loss mechanisms, dE/dx, in dense matter. In particular, we consider the consequences of a possible sudden decrease of dE/dx near the quark-gluon plasma phase transition temperature. We find that such a change decreases the rate of quenching with increasing A and may under favorable conditions lead to one of the signatures of that transition. In any case, hard jets provide a powerful" external" probe of the transient dense matter produced in such reactions because their production rates are calculable with perturbative QCD [l] up to a slowly varying correction factor J {rv 2. The main difficulty is that those rates are very small and large soft and mini-jet background fluctuations [2, 3] may complicate their detection. Previous jet calculations [4, 5, 6] for nuclear collisions considered enhanced acoplanarity of jets as a probe of multiple scattering in dense matter. Unfortunately, as emphasized in [5, 6], increased acoplanarity is expected to occur in both confined and deconfined phases of dense matter. A reduction of dE/dx with increasing density would, on the other hand, be a novel effect that could only occur if there were a dramatic change in the nature of quark interactions at very high densities. While we cannot prove that such a decrease is necessarily associated with the QCD de confinement transition, we motivate that possibility by reviewing recent lattice" data" and by showing that radiative energy loss is suppressed for high energy jets. The jet attenuation factor is then calculated varying generously dE/dx and taking into account large uncertainties in the time-evolution of ultrarelativistic nuclear collisions.