SU(3)协变手征有效理论与八重态重子质量修正  

SU(3)covariant chiral effective theory and corrections to the octet baryon masses

作　　者：刘舟 杨继锋[1] LIU Zhou;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）》2022年第4期103-113,共11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,计算了基于奇异夸克贡献的八重态、十重态重子对八重态重子质量的一圈图修正;发现破坏手征幂律规则的都是定域项,可通过定域抵消项减除,从而指向一个更为简洁的减除方案——扩展的极小减除(Extended Minimal Subtraction,EMS)方案;除了手征贡献,计算还保留了相对论修正项.这对精确计算重子质量的修正有价值,并对解析外推有重要贡献.In this paper,corrections to the octet baryon masses based on the strange quark contribution are calculated using the SU(3)covariant chiral effective theory.We find that the items violating chiral power counting rules are local and can be subtracted by local counterterms which leads to extended minimal subtraction(EMS)scheme.In addition to the chiral contribution,relativistic correction items are also retained,which is meaningful for accurately calculating the corrections to baryon masses and analytical extrapolation.

关 键 词：协变手征有效场论 八重态重子 手征幂律规则 EMS方案 

分 类 号：O413.3[理学—理论物理]