论文标题
Partononic Critical Critical Opalescence及其对喷气淬灭参数$ \ hat {q} $的影响
Partonic Critical Opalescence and Its Impact on the Jet Quenching Parameter $\hat{q}$
论文作者
论文摘要
喷气淬灭参数$ \ hat {q} $对于表征喷气零件与核物质之间的相互作用强度至关重要。基于夸克 - 梅森（QM）模型，我们开发了一个新框架，用于计算有限化学势的$ \ hat {q} $，其中$ \ hat {q} $与手性订单参数的光谱函数有关。达到一环顺序的扰动计算表明，在高温和高化学电位上，喷气机的动量扩大均增强，并且与Partononic阶段的Parton数量密度大致成正比。 We further investigate the behavior of $\hat{q}$ in the vicinity of the critical endpoint (CEP) by coupling our calculation with a recently developed equation of state that includes a CEP in the universality class of the Ising model, from which we discover the partonic critical opalescence (PCO) -- a prominent enhancement of the momentum broadening of jets near CEP, contributed by the scatterings via the $σ$ exchange process.因此，首次与CEP的搜索相连。
Jet quenching parameter $\hat{q}$ is essential for characterizing the interaction strength between jet partons and nuclear matter. Based on the quark-meson (QM) model, we develop a new framework for calculating $\hat{q}$ at finite chemical potentials, in which $\hat{q}$ is related to the spectral function of the chiral order parameter. A perturbative calculation up to the one-loop order indicates that the momentum broadening of jets is enhanced at both the high temperature and high chemical potential, and approximately proportional to the parton number density in the partonic phase. We further investigate the behavior of $\hat{q}$ in the vicinity of the critical endpoint (CEP) by coupling our calculation with a recently developed equation of state that includes a CEP in the universality class of the Ising model, from which we discover the partonic critical opalescence (PCO) -- a prominent enhancement of the momentum broadening of jets near CEP, contributed by the scatterings via the $σ$ exchange process. Hence, for the first time, jet quenching is connected with the search of CEP.
