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Enhancement of deltaful two-pion exchange nuclear forces

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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 cut-off 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.

chiral nuclear forcedelta resonancepower counting

Haiming Chen、Rui Peng、Songlin Lyu、Bingwei Long

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College of Physics,Sichuan University,Chengdu,Sichuan 610065,China

School of Physics,Peking University,Beijing 100871,China

Southern Center for Nuclear-Science Theory(SCNT),Institute of Modern Physics,Chinese Academy of Sciences,Huizhou 516000,Guangdong Province,China

2024

10.1088/1572-9494/ad5716

理论物理通讯(英文版)
中国科学院理论物理研究所 中国物理学会

理论物理通讯(英文版)

CSTPCD
影响因子：0.333
ISSN：0253-6102
年,卷(期)：2024.76(9)