How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?
High Energy Physics - Phenomenology
2010-02-17 v1 Nuclear Theory
Abstract
The isovector GMO sum rule for zero energy forward pion-nucleon scattering is critically studied to obtain the charged pion-nucleon coupling constant using the precise negatively charged pion-proton and pion-deuteron scattering lengths deduced recently from pionic atom experiments. This direct determination leads to a pseudoscalar charged pion-nucleon coupling constant of 14.23 +- 0.09 (statistic) +- 0.17 (systematic). We obtain also accurate values for the pion-nucleon scattering lengths.
Cite
@article{arxiv.hep-ph/0002056,
title = {How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?},
author = {B. Loiseau and T. E. O. Ericson and A. W. Thomas},
journal= {arXiv preprint arXiv:hep-ph/0002056},
year = {2010}
}
Comments
Talk given at the Eighth International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, Switzerland, August 15-21, 1999, 5 pages, 2 figures, file menu.cls included