eta-Nucleon Scattering Length and Effective Range uncertainties
Nuclear Theory
2014-11-18 v2
Abstract
The coupled eta-N, pi-N, gamma-N, 2pi-N system is described by a K-matrix method. The parameters in this model are adjusted to get an optimal fit to pi-N-->pi-N, pi-N-->eta-N, gamma-N-->pi-N and gamma-N-->eta-N data in an energy range of about 100 MeV or so each side of the eta-threshold. Compared with our earlier analysis, we now utilize recent Crystal Ball data. However, the outcome confirms our previous result that the eta-nucleon scattering length (a) is large with a value of 0.91(6)+i0.27(2) fm.
Cite
@article{arxiv.nucl-th/0411024,
title = {eta-Nucleon Scattering Length and Effective Range uncertainties},
author = {A. M. Green and S. Wycech},
journal= {arXiv preprint arXiv:nucl-th/0411024},
year = {2014}
}
Comments
13 pages, 2 figures. Misprints in Eq. 7 are corrected