高能重离子碰撞中$Z/γ$ -喷流中喷流诱导扩散尾流的二维射流层析成像研究
Search for the elusive jet-induced diffusion wake in $Z/γ$-jets with 2D jet tomography in high-energy heavy-ion collisions
摘要：
扩散尾流是高能重离子碰撞中喷流引起的介质响应的一个明确的部分，它导致了与喷流传播方向相反的软强子的耗尽。然而，大型强子对撞机上Pb+Pb碰撞中$Z$ -强子关联的新实验数据表明，在$Z$和喷流方向上软强子的增强。使用耦合的线性玻尔兹曼输运和流体模型，我们表明，从初始的多个部分子相互作用（MPI）的部分子的介质修改引起的软强子增强，是均匀的方位角，而射流诱导的介质响应和软胶子辐射占主导地位的射流方向的增强。用混合事件程序减去MPI的贡献后，扩散尾流在近侧$Z$ -强子相关中变得可见。我们进一步采用纵向和横向梯度喷流层析首次定位的初始喷流产生的位置在$Z/γ$喷流事件中的扩散尾流的影响是明显的$Z/γ$ -强子关联，即使没有扣除MPI。
英文摘要：
Diffusion wake is an unambiguous part of the jet-induced medium response in high-energy heavy-ion collisions that leads to a depletion of soft hadrons in the opposite direction of the jet propagation. New experimental data on $Z$-hadron correlation in Pb+Pb collisions at the Large Hadron Collider show, however, an enhancement of soft hadrons in the direction of both the $Z$ and the jet. Using a coupled linear Boltzmann transport and hydro model, we demonstrate that medium modification of partons from the initial multiple parton interaction (MPI) gives rise to a soft hadron enhancement that is uniform in azimuthal angle while jet-induced medium response and soft gluon radiation dominate the enhancement in the jet direction. After subtraction of the contributions from MPI with a mixed-event procedure, the diffusion wake becomes visible in the near-side $Z$-hadron correlation. We further employ the longitudinal and transverse gradient jet tomography for the first time to localize the initial jet production positions in $Z/γ$-jet events in which the effect of the diffusion wake is apparent in $Z/γ$-hadron correlation even without the subtraction of MPI.
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