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Determination of the Pion-Nucleon Coupling Constant in the VPI/GW Pion-Nucleon Elastic Scattering Partial Wave and Dispersion Relation Analyis | | M. M. Pavan
; R. A. Arndt
; I. I. Strakovsky
; R. L. Workman
; | | Date: |
14 Oct 1999 | | Journal: | PiN Newslett. 15 (1999) 171-175; Phys.Scripta T87 (2000) 65-70 | | Subject: | nucl-th | | Affiliation: | MIT, Cambridge MA), R. A. Arndt (VPI, Blacksburg VA), I. I. Strakovsky and R. L. Workman (GWU, Washington D.C. | | Abstract: | 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^2/4pi 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. | | Source: | arXiv, nucl-th/9910040 | | Services: | Forum | Review | PDF | Favorites | |
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