重子磁矩的协变手征有效理论研究  

Study of baryon magnetic moments in covariant chiral effective theory

作　　者：周海峰 杨继锋[1] ZHOU Haifeng;YANG Jifeng(School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学物理与电子科学学院,上海200241

出　　处：《华东师范大学学报（自然科学版）》2024年第3期12-26,共15页Journal of East China Normal University(Natural Science)

基　　金：国家自然科学基金(11435005)。

摘　　要：在SU(3)协变手征有效理论框架下,使用扩展的极小减除(extended minimal subtraction,EMS)方案,计算了至次领头阶(next-to-leading order,NLO)的重子质量和重子磁矩的一圈图修正贡献,并使用实验数据与PACS-CS格点数据组的数据对解析结果进行了数值拟合.结果表明,在NLO重子质量和重子磁矩的修正贡献中,EMS方案可以给出不错的理论结果和数值拟合的结果;该结果相较于重重子方法和红外正规化方法的结果更加优秀,并且与EOMS(extended-on-mass-shell)方案的结果相近.In this paper,we calculate the next-to-leading order(NLO)corrections to the baryon mass and magnetic moment using the covariant chiral perturbation theory within the extended minimal subtraction(EMS)scheme under SU(3).We also present a comparative analysis of the experimental data and lattice quantum chromodynamics data with the EMS results,and extrapolate it into physical value.We show that EMS provides a reasonable theoretical and numerical result at the NLO,better than those obtained from the heavy-baryon approach and infrared regularization,and close to that obtained by the extended-on-mass-shell(EOMS)scheme.

关 键 词：手征有效场论 扩展的极小减除方案 重子质量 重子磁矩 数值拟合 

分 类 号：O413.3[理学—理论物理]