胶子饱和初态的示意强子化引起的低动量π介子增强
Low-momentum pion enhancement from schematic hadronization of a gluon-saturated initial state
摘要：
研究了超相对论重离子碰撞早期的粒子产生。为此，考虑胶子和π介子弹性再散射的玻尔兹曼动力学方程与一个简单的模型的部分子强子转换过程（强子化）。结果表明，初态下胶子相空间的过布居导致了低动量胶子区的玻色增强的中间阶段，由于胶子-π介子的转换过程，这一中间阶段反映在最终的π介子分布函数中.这种模式与欧洲核子研究中心大型强子对撞机的ALICE实验中发现的低动量π介子增强非常相似。本文讨论了强子产生的热统计模型与热冻结和化学冻结现象的关系。
英文摘要：
We study the particle production in the early stage of the ultrarelativistic heavy-ion collisions. To this end the Boltzmann kinetic equations for gluons and pions with elastic rescattering are considered together with a simple model for the parton-hadron conversion process (hadronisation). It is shown that the overpopulation of the gluon phase space in the initial state leads to an intermediate stage of Bose enhancement in the low-momentum gluon sector which due to the gluon-pion conversion process is then reflected in the final distribution function of pions. This pattern is very similar to the experimental finding of a low-momentum pion enhancement in the ALICE experiment at CERN LHC. Relations to the thermal statistical model of hadron production and the phenomenon of thermal and chemical freeze-out are discussed in this context.
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