학술논문
S-wave {Lambda}{pi} phase shift is not large
Document Type
Journal Article
Author
Source
Physical Review D; 64; 1; Other Information: DOI: 10.1103/PhysRevD.64.014006; Othernumber: PRVDAQ000064000001014006000001; 067111PRD; PBD: 1 Jul 2001
Subject
Language
English
ISSN
0556-2821
Abstract
We study the strong interaction S-wave {Lambda}{pi} phase shift in the region of the {Xi} mass in the framework of a relativistic chiral unitary approach based on coupled channels. All parameters have been previously determined in a fit to strangeness S={minus}1 S-wave kaon-nucleon data. We find 0{degree}{le}{delta}{sub 0}{le}1.1{degree} in agreement with previous chiral perturbation theory calculations (or extensions thereof). We also discuss why a recent coupled channel K-matrix calculation gives a result for {delta}{sub 0} that is negative and much bigger in magnitude. We argue why that value should not be trusted.