Pion-nucleon scattering in a new approach to chiral perturbation theory

被引：142

作者：

Ellis, PJ ^{[1
]}

Tang, HB ^{[1
]}

机构：

[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

来源：

PHYSICAL REVIEW C | 1998年 / 57卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.57.3356

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We study pion-nucleon scattering with a chiral Lagrangian of pions, nucleons, and Delta isobars. The scattering amplitude is evaluated to one-loop Q(3) order, where Q is a generic small momentum, using an approach which is equivalent tb heavy baryon chiral perturbation theory. We obtain a good fit to the experimental phase shifts for pion center-of-mass kinetic energies up to 100 MeV. A sigma term greater than 45 MeV is favored, but the value is not well determined.

引用

页码：3356 / 3375

页数：20

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