论文标题
重型离子碰撞中喷气猝灭的梯度断层扫描
Gradient Tomography of Jet Quenching in Heavy-Ion Collisions
论文作者
论文摘要
横向动量拓宽和传播part顿的能量损失取决于密集的QCD培养基中喷气运输系数$ \ hat Q $的时空轮廓。垂直于传播方向的$ \ hat Q $的空间梯度会导致Parton横向动量分布的漂移和不对称性。这样的不对称性取决于沿横向梯度的空间位置和传播Parton的路径长度，如Boltzmann传输的数值解决方案所示，以漂移扩散方程的简化形式显示。在高能重型离子碰撞中，这种不对称性相对于由光束和触发粒子（光子，强体或喷气子）定义的平面，相对于事件平面的给定取向与在线性boltzmann传输模型中的全事件逐个事件模拟中相对于事件平面的给定取向。这样的梯度断层扫描可用于定位初始的喷射生产位置，以更详细地研究重型离子碰撞中给定的繁殖路径Quark-Gluon等离子体的喷气淬火和性能。
Transverse momentum broadening and energy loss of a propagating parton are dictated by the space-time profile of the jet transport coefficient $\hat q$ in a dense QCD medium. The spatial gradient of $\hat q$ perpendicular to the propagation direction can lead to a drift and asymmetry in parton transverse momentum distribution. Such an asymmetry depends on both the spatial position along the transverse gradient and path length of a propagating parton as shown by numerical solutions of the Boltzmann transport in the simplified form of a drift-diffusion equation. In high-energy heavy-ion collisions, this asymmetry with respect to a plane defined by the beam and trigger particle (photon, hadron or jet) with a given orientation relative to the event plane is shown to be closely related to the transverse position of the initial jet production in full event-by-event simulations within the linear Boltzmann transport model. Such a gradient tomography can be used to localize the initial jet production position for more detailed study of jet quenching and properties of the quark-gluon plasma along a given propagation path in heavy-ion collisions.
