Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-10-14
PiN Newslett. 15 (1999) 171-175; Phys.Scripta T87 (2000) 65-70
Physics
Nuclear Physics
Nuclear Theory
Proceedings of the Pion-Nucleon Coupling Constant Workshop, Uppsala, Sweden, June 7-8 1999 To be published by Physica Scripta
Scientific paper
10.1238/Physica.Topical.087a0006
Our extraction of the pion-nucleon coupling constant from \pi p elastic scattering data is outlined. A partial wave analysis (T_{\pi} < 2100 MeV) is performed simultaneously with a fixed-t dispersion relation analysis (T_{\pi} < 800 MeV). The \pi NN coupling constant g^2/4\pi is searched to find the best fit. The result 13.73 \pm 0.01 \pm 0.07 (first error statistical, second systematic) is found to be insensitive to database changes and Coulomb barrier corrections. This value satisfies important elements of low energy QCD like the Goldberger-Treiman discrepancy, the Dashen-Weinstein sum rule, and chiral perturbation theory predictions of threshold pion photoproduction.
Arndt Richard A.
Pavan Marcello M.
Strakovsky Igor I.
Workman Ron L.
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