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Eighth International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz : Suisse
How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?
B. Loiseau1, T. E. O. Ericson, A. W. Thomas

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.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Physique des Hautes Energies - Phénoménologie

Physique/Physique Nucléaire Théorique
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