Restriction on the form of the quark anomalous magnetic moment from lattice QCD results  

作　　者：Mamiya Kawaguchi 黄梅 Mamiya Kawaguchi;Mei Huang(School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2023年第6期108-121,共14页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(12235016,12221005,11725523,11735007);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34030000,XDPB15);start-up funding from the University of Chinese Academy of Sciences(UCAS);the Fundamental Research Funds for the Central Universities。

摘　　要：The quark anomalous magnetic moment(AMM)is dynamically generated through spontaneous chiral symmetry breaking.It has been revealed that,even though its exact form is still unknown,the quark AMM is essential to exploring quark matter properties and QCD phase structure under external magnetic fields.In this study,we take three different forms of the quark AMM and investigate its influence on the chiral phase transition under a magnetic field.In general,a negative(positive)quark AMM acts as a magnetic-catalyzer(magnetic-inhibitor)for chiral symmetry breaking.It is found that a constant quark AMM drives an unexpected 1st order chiral phase transition,a quark AMM proportional to the chiral condensate flips the sign on the chiral condensate,and a quark AMM proportional to the square of the chiral condensate suppresses the magnetic enhancement in the chiral condensate at finite temperatures while retaining the chiral crossover phase transition.We also evaluate the intrinsic temperature dependence of the effective AMM form by fitting the effective model result of the chiral condensate to lattice QCD data,which may have a nontrivial correlation with the chiral phase transition.

关 键 词：chiral symmetry phase diagram of QCD external magnetic field chiral effective model fi-nite temperature field theory 

分 类 号：O572.33[理学—粒子物理与原子核物理]