The Nucleon Sigma Term from Threshold Parameters
High Energy Physics - Phenomenology
2009-10-31 v2 Nuclear Theory
Abstract
A new sum rule determines the nucleon sigma term by the \pi N elastic scattering threshold parameters alone. This "threshold" value of \sigma(2\mu^2) provides an independent check of existing values obtained from global dispersive analyses, and also provides a realistic error assignment. Employing a recent analysis of low energy (T_\pi < 100 MeV) \pi N data our sum rule implies \sigma(2\mu^2) = 71\pm 9 MeV.
Cite
@article{arxiv.hep-ph/0001203,
title = {The Nucleon Sigma Term from Threshold Parameters},
author = {M. G. Olsson},
journal= {arXiv preprint arXiv:hep-ph/0001203},
year = {2009}
}
Comments
Additional explanations and references, changes in notation, small numerical changes. 11 pages, Revtex, uses epsf.sty, 1 postscript figure. Version to be published in Physics Letters B