Sea quark contributions to nucleon electromagnetic form factors with the nonlocal chiral effective Lagrangian  

作　　者：Ming-Yang Yang Ping Wang 杨明炀;王平(Institute of High Energy Physics,CAS,P.O.Box 918(4),Beijing 100049,China;College of Physics Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Theoretical Physics Center for Science Facilities,CAS,Beijing 100049,China)

机构地区：[1]Institute of High Energy Physics,CAS,P.O.Box 918(4),Beijing 100049,China [2]College of Physics Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]Theoretical Physics Center for Science Facilities,CAS,Beijing 100049,China

出　　处：《Chinese Physics C》2020年第5期1-7,共7页中国物理C（英文版）

基　　金：Supported by the National Natural Sciences Foundations of China(11475186);the Sino-German CRC 110“Symmetries and the Emergence of Structure in QCD”project by NSFC(11621131001)。

摘　　要：The sea quark contributions to the nucleon electromagnetic form factors of the up,down and strange quarks are studied with the nonlocal chiral effective Lagrangian.Both octet and decuplet intermediate states are included in the one loop calculations.Compared with the strange quark form factors,although their signs are the same,the absolute value of the light quark form factors are much larger.For both the electric and magnetic form factors,the contribution of the d quark is larger than of the u quark.The current lattice simulations of the light sea quark form factors are in between our results for the u and d quarks.

关 键 词：electromagnetic form factors NONLOCAL LAGRANGIAN CHIRAL SYMMETRY 

分 类 号：O572.33[理学—粒子物理与原子核物理]