华东师范大学学报（自然科学版）Issue(3)：121-128,8.DOI:10.3969/j.issn.1000-5641.2018.03.013
强子结构的协变手征有效理论分析
An analysis of the hadron structure in covariant chiral effective theory
摘要
Abstract
The matrix elements of twist-2 operators related to nucleon-parton distributions were calculated at one-loop level in the framework of covariant chiral perturbation theory.It was found that all who violate chiral power counting reside in the local terms depending on nucleon mass;hence,they could be readily removed through local counterterms,namely the contributions left over fulfill chiral power counting just like with HBChPT (Heavy Baryon Chiral Perturbation Theory).Meanwhile,one may arrive at incorrect behaviors near baryon thresholds due to the oversimplification of baryon propagators in HBChPT.The results here further support the proposition that the approach of covariant chiral perturbation theory with proper subtractions could both preserve the correct threshold behaviors and fulfill chiral power counting,and hence is a framework more suitable for investigating hadron physics.关键词
手征有效场论/强子结构/协变框架/定域项/重重子手征微扰论Key words
chiral effective field theory/hadron structures/covariant framework/local terms/heavy baryon chiral perturbation theory分类
数理科学引用本文复制引用
温莉宏,杨继锋..强子结构的协变手征有效理论分析[J].华东师范大学学报（自然科学版）,2018,(3):121-128,8.基金项目
国家自然科学基金(11435005) （11435005）
