论文标题
QCD手性跨界关键性的非扰动风味的分析
Analysis on nonperturbative flavor violation at chiral crossover criticality in QCD
论文作者
论文摘要
我们讨论了高温下违反夸克风味对称性的，这是基于非扰动热环校正和轴向异常引起的，基于三种味道线性 - 含量模型，包括轴向 - 异常诱发的味道破裂项。我们采用康沃尔 - 杰克·托姆·托姆（Cornwall-Jackiw-Tomboulis）形式主义的非扰动分析，并表明该模型经历了具有伪临界温度的手性跨界，并始终与晶格观测。我们发现以下有关伪关键温度周围和之上的风味突破的特征：i）上下夸克冷凝物下降的速度比奇怪的夸克（Quark）降低的速度快，但仍然保持非零值甚至超过临界温度； ii）引入的与异常相关的破坏性效应充当了手性恢复的催化剂，并减少了向上，下降和奇怪的夸克冷凝物中破裂的风味量； iii）观察到了介体风味混合结构的戏剧性变形，其中发现异常的偏爱破裂几乎是无关紧要的； iv）梅森光谱法可以通过净非扰动风味破裂效应来纠正，在这种效果下，标量梅森质量层次结构（反向质量层次结构）因存在与异常相关的风味破裂而显着改变； v）拓扑敏感性显着从幸存的奇怪夸克冷凝物中得到了贡献，这不能由手性扰动理论决定，并偏离了稀释的Instanton气体预测。在那里，异常引起的风味破裂起着破坏性干扰净风味的作用。 vi）u（1）_a破裂得到了奇怪的夸克冷凝物的增强，这可能解释了有效的U（1）_a _a恢复的张力，在手掌极限附近的晶格上观察到的晶格上观察到的恢复。
We discuss the violation of quark-flavor symmetry at high temperatures, induced from nonperturbative thermal loop corrections and axial anomaly, based on a three-flavor linear-sigma model including an axial-anomaly induced-flavor breaking term. We employ a nonperturbative analysis following the Cornwall-Jackiw-Tomboulis formalism, and show that the model undergoes a chiral crossover with a pseudo-critical temperature, consistently with lattice observations. We find following features regarding the flavor breaking eminent around and above the pseudo-critical temperature: i) up-and down-quark condensates drop faster than the strange quark's toward the criticality, but still keep nonzero value even going far above the critical temperature; ii) the introduced anomaly-related flavor-breaking effect acts as a catalyzer toward the chiral restoration, and reduces the amount of flavor breaking in the up, down and strange quark condensates; iii) a dramatic deformation for the meson flavor mixing structure is observed, in which the anomaly-induced favor breaking is found to be almost irrelevant; iv) the meson spectroscopy gets corrected by the net nonperturbative flavor breaking effects, where the scalar meson mass hierarchy (inverse mass hierarchy) is significantly altered by the presence of the anomaly-related flavor breaking; v) the topological susceptibility significantly gets the contribution from the surviving strange quark condensate, which cannot be dictated by the chiral perturbation theory, and deviates from the dilute instanton gas prediction. There the anomaly-induced flavor breaking plays a role of the destructive interference for the net flavor violation; vi) the U(1)_A breaking is enhanced by the strange quark condensate, which may account for the tension in the effective U(1)_A restoration observed on lattices with two flavors and 2+1 flavors near the chiral limit.
