Enhancement of deltaful two-pion exchange nuclear forces  

作　　者：Haiming Chen Rui Peng Songlin Lyu Bingwei Long 

机构地区：[1]College of Physics,Sichuan University,Chengdu,Sichuan 610065,China [2]School of Physics,Peking University,Beijing 100871,China [3]Southern Center for Nuclear-Science Theory(SCNT),Institute of Modern Physics,Chinese Academy of Sciences,Huizhou 516000,Guangdong Province,China

出　　处：《Communications in Theoretical Physics》2024年第9期48-54,共7页理论物理通讯（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)under Grant Nos.12275185,12335002(BL),and 12347154(RP)。

摘　　要：The role of the delta isobar degrees of freedom in nucleon–nucleon scattering is revisited.We attempt to understand why the dimensionally regularized two-pion exchanges with the explicit delta isobar is much stronger than the ones with spectral function regularization.When the cutoff value of spectral function regularization is varied,the isoscalar central component exhibits a rather large cut-off variation.This reveals a surprisingly large numerical factor of the deltaful two-pion exchange potentials.The power counting is adjusted accordingly and we discuss the results and how to improve upon this finding.

关 键 词：chiral nuclear force delta resonance power counting 

分 类 号：O572.33[理学—粒子物理与原子核物理]