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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
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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.
作者 周海峰 杨继锋 ZHOU Haifeng;YANG Jifeng(School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)
出处 《华东师范大学学报(自然科学版)》 CAS CSCD 北大核心 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)。
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 covariant chiral effective field theory extended minimal subtraction scheme baryon mass baryon magnetic moment numerical fitting
作者简介 通信作者:杨继锋,男,副教授,硕士生导师,研究方向为粒子物理与场论.E-mail:jfyang@phy.ecnu.edu.cn。
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