arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.02202hep-phnucl-th
收藏

从小半径到大半径的射流抑制

Jet suppression from small to large radius

Daniel Pablos

摘要:

喷流抑制的角度依赖性编码的关键信息的过程中的能量和动量流体动力学,因此,可以用来大大提高我们的理解喷流/QGP相互作用的基本方面。在这项工作中,我们研究喷流抑制从小到很大的半径,在LHC和RHIC的低和很高的能量射流。我们使用的混合强/弱耦合模型射流淬火相结合的扰动簇射演化与一个有效的强耦合描述的能量和动量转移从射流到QGP。由于能量-动量守恒,由射流产生的尾流根据粒子相对于射流方向的取向来增强或消耗在冻结超曲面处产生的粒子的产率。我们发现喷流抑制与反$k_T$半径R显著无关,特别是在LHC上,首先通过打开R略微增加,然后在较大的R值下缓慢减小。喷流抑制与R的这种几乎独立性是由两种竞争效应引起的,即高能喷流成分的较大能量损失,这往往会增加抑制,而由于介质响应而损失的能量的部分恢复,这会减少抑制。我们发现,从反冲喷流的助推介质消耗的量QGP在相反的方向上,它在横向平面,诱导能量损失,由于过减效应。我们表明,这种独特的签名的流体动力学的一部分的射流能量可以通过选择样品的dijet配置与不同的相对快速性之间的领先和subleading射流进行审查。

英文摘要:

The angular dependence of jet suppression encodes key information about the process of energy and momentum hydrodynamization, and for this reason can be used to greatly improve our understanding of fundamental aspects of the jet/QGP interaction. In this work we study jet suppression from small to very large radius, for low and very high energy jets at the LHC and RHIC. We use the hybrid strong/weak coupling model for jet quenching that combines perturbative shower evolution with an effective strongly coupled description of the energy and momentum transfer from the jet into the QGP. Because of energy-momentum conservation, the wake created by the jet enhances or depletes the yield of particles generated at the freeze-out hypersurface depending on their orientation with respect to the direction of the jet. We find that jet suppression is remarkably independent of the anti-$k_T$ radius R, specially at LHC, first slightly increasing by opening R, then at larger values of R slowly decreasing. This nearly independence of jet suppression with R arises from two competing effects, namely the larger energy loss of the energetic jet components, which tends to increase suppression, against the partial recovery of the lost energy due to medium response, which reduces suppression. We find that the boosted medium from the recoiling jet depletes the amount of QGP in the direction opposite to it in the transverse plane, inducing energy loss due to an over-subtraction effect. We show that this unique signature of the hydrodynamization of part of the jet energy can be scrutinized by selecting samples of dijet configurations with different relative rapidities between the leading and the subleading jet.

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。

↑