Conical flow induced by quenched QCD jets
Conical flow induced by quenched QCD jets
复制标题
DOI：
10.1088/1742-6596/27/1/003
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J Casalderrey-Solana;E. V. Shuryak;D Teaney
中科院分区：
文献类型：
--
作者：
J Casalderrey-Solana;E. V. Shuryak;D Teaney
淬火是最近发现的一种现象，在这种现象中，重离子碰撞产生的QCD喷流将大部分甚至全部的能量和动量存款到产生的物质中。在RHIC和更高的能量下，物质是具有非常小粘度的强耦合夸克-胶子等离子体（sQGP），我们建议这种能量/动量作为集体激发或“锥形流”传播。类似的流体动力学现象是众所周知的，例如来自超音速飞机的所谓音爆。我们求解线性化的相对论流体动力学方程，以详细描述流动图像。我们认为，对于RHIC碰撞，这种流动的方向应该与射流成一个特定的大角度，大约70°，从而导致粒子相关性的峰值在相对于大PT触发角Δ θ = π ± 1.2 rad处。这个角度恰好与最近由星星和凤凰合作所看到的触发相关的秒角分布中最大值的位置完全匹配。我们还简要讨论了可能的替代解释，并提出了一些进一步的测试，以澄清机制。
Quenching is a recently discovered phenomenon in which QCD jets created in heavy ion collisions deposit a large fraction or even all their energy and momentum into the produced matter. At RHIC and higher energies, where that matter is a strongly coupled Quark-Gluon Plasma (sQGP) with very small viscosity, we suggest that this energy/momentum propagate as a collective excitation or ‘‘conical flow’’. Similar hydrodynamical phenomena are well known, e.g. the so called sonic booms from supersonic planes. We solve the linearized relativistic hydrodynamic equations to detail the flow picture. We argue that for RHIC collisions the direction of this flow should make a cone at a specific large angle with the jet, of about 70°, and thus lead to peaks in particle correlations at the angle Δϕ = π ± 1.2 rad relative to the large-pt trigger. This angle happens to match perfectly the position of the maximum in the angular distribution of secondaries associated with the trigger recently seen by the STAR and PHENIX collaborations. We also discuss briefly possible alternative explanations and suggest some further tests to clarify the mechanism.