(Pseudo) Scalar mesons in a self-consistent NJL model  

作　　者：俞笑竹 王昕杨 Xiaozhu Yu;Xinyang Wang(Department of Physics,Jiangsu University,Zhenjiang 212013,China;School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China)

机构地区：[1]Department of Physics,Jiangsu University,Zhenjiang 212013,China [2]School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China

出　　处：《Chinese Physics C》2023年第12期40-44,共5页中国物理C（英文版）

基　　金：the Start-up Funding of Jiangsu University(4111190010);the Natural Science Foundation of China(12147103)。

摘　　要：In this study, we investigate the mass spectra of π and σ mesons at finite chemical potential using theself-consistent NJL model and the Fierz-transformed interaction Lagrangian. The model introduces an arbitrary parameterα to reflect the weights of the Fierz-transformed interaction channels. We show that, when α exceeds a certainthreshold value, the chiral phase transition transforms from a first-order one to a smooth crossover, which is evidentfrom the behaviors of the chiral condensates and meson masses. Additionally, at a high chemical potential, the smallerthe value of α, the higher the masses of the π and σ mesons. Moreover, the Mott and dissociation chemical potentialsincrease with the increase in α. Thus, the meson mass emerges as a valuable experimental observable for determiningthe value of α and investigating the properties of the chiral phase transition in dense QCD matter.

关 键 词：NJL model chiral phase transition MESON 

分 类 号：O572.33[理学—粒子物理与原子核物理]