arXiv 1506.090822015-06hep-ph

不稳定夸克-胶子等离子体中的能量损失

Energy Loss in Unstable Quark-Gluon Plasma

Margaret E. Carrington, Katarzyna Deja, Stanislaw Mrowczynski

备注：: 23 pages, 11 figures, minor changes, to appear in Phys. Rev. C
发表信息：: Phys. Rev. C 92, 044914 (2015)
DOI：: 10.1103/PhysRevC.92.044914

摘要：

在相对论重离子碰撞的早期阶段，夸克-胶子等离子体的动量分布是各向异性的，因此，色磁等离子体模使假定为弱耦合的系统不稳定.我们考虑了一个高能部分子穿越不稳定等离子体时，部分子与介质之间的能量转移作为初值问题来研究。在平衡等离子体的情况下，著名的碰撞能量损失公式重现。不稳定等离子体的情况要复杂得多，部分子可以根据初始条件损失或获得能量。以极长球和极扁球系统为例，讨论了不稳定等离子体的两类初始条件。当初始色动力学场与部分子的色态不相关时，它通常会损失能量，并且能量损失的幅度与相同密度的平衡等离子体中的能量损失相当。当初始色动力学场由部分子诱导时，它可以加速或减速，这取决于相对相位因子。在相关的初始条件下，能量转移随时间呈指数增长，其幅度可以远远超过平衡等离子体中能量损失的绝对值。能量转移也是强烈的方向依赖性。本文简要讨论了我们的研究结果对相对论性重离子碰撞中喷流淬灭现象的影响。

英文摘要：

The momentum distribution of quark-gluon plasma at the early stage of a relativistic heavy-ion collision is anisotropic and consequently the system, which is assumed to be weakly coupled, is unstable due chromomagnetic plasma modes. We consider a high-energy parton which flies across such an unstable plasma, and the energy transfer between the parton and the medium is studied as an initial value problem. In the case of equilibrium plasmas, the well-known formula of collisional energy loss is reproduced. The unstable plasma case is much more complex, and the parton can lose or gain energy depending on the initial conditions. The extremely prolate and extremely oblate systems are considered as examples of unstable plasmas, and two classes of initial conditions are discussed. When the initial chromodynamic field is uncorrelated with the color state of the parton, it typically looses energy, and the magnitude of the energy loss is comparable to that in an equilibrium plasma of the same density. When the initial chromodynamic field is induced by the parton, it can be either accelerated or decelerated depending on the relative phase factor. With a correlated initial condition, the energy transfer grows exponentially in time and its magnitude can much exceed the absolute value of energy loss in an equilibrium plasma. The energy transfer is also strongly directionally dependent. Consequences of our findings for the phenomenology of jet quenching in relativistic heavy-ion collisions are briefly discussed.

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