Quark and Gluon Production from a Boost-invariantly Expanding Color Electric Field
Quark and Gluon Production from a Boost-invariantly Expanding Color Electric Field
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DOI：
10.1103/physrevd.96.014033
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发表时间：
2016-09
影响因子：
5
通讯作者：
H. Taya
中科院分区：
文献类型：
--
作者：
H. Taya
在超相对论重离子碰撞的早期动力学背景下，人们广泛地研究了扩展的经典色电磁场的粒子产生。我们发展了一个单圈阶的形式，通过正则量子化夸克、胶子和鬼涨落来计算粒子谱。正则量子化是在τ-η坐标中进行的，以便明显地考虑到扩展几何。作为示范，我们用寿命为T的增强不变扩展的均匀色电场来模拟扩展的经典色背景场，通过非微扰求解QCD关于色电场的运动方程，解析地得到了夸克和胶子的产生谱。在本文中，我们研究（i）有限寿命效应，这是发现显着修改粒子谱从那些预期的Schwinger公式;（ii）夸克和胶子生产之间的差异;和（iii）夸克质量依赖的生产谱。这些结果的影响，超相对论重离子碰撞进行了讨论。
Particle production from an expanding classical color electromagnetic field is extensively studied, motivated by the early stage dynamics of ultrarelativistic heavy ion collisions. We develop a formalism at one-loop order to compute the particle spectra by canonically quantizing quark, gluon, and ghost fluctuations under the presence of such an expanding classical color background field; the canonical quantization is done in the τ-η coordinates in order to take into account manifestly the expanding geometry. As a demonstration, we model the expanding classical color background field by a boost-invariantly expanding homogeneous color electric field with lifetime T, for which we obtain analytically the quark and gluon production spectra by solving the equations of motion of QCD nonperturbatively with respect to the color electric field. In this paper we study (i) the finite lifetime effect, which is found to modify significantly the particle spectra from those expected from the Schwinger formula; (ii) the difference between the quark and gluon production; and (iii) the quark mass dependence of the production spectra. Implications of these results to ultrarelativistic heavy ion collisions are also discussed.