Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-12-15
Proc. of the 8th Int. Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, Engadine, Switzerland, 1999,
Physics
Nuclear Physics
Nuclear Theory
Proceedings of the 8th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, Switzerland, A
Scientific paper
A new result for the nucleon sigma term from an updated pion-nucleon partial-wave and dispersion relation analysis of the Virginia Polytechnic Institute (now George Washington University) group is discussed. Using a method similar to that of Gasser, Leutwyler, Locher, and Sainio, we obtain Sigma=90 +/- 8 MeV (preliminary), in disagreement with the canonical result 64 +/- 8 MeV, but consistent with expectations based on new information on the $\pi$NN coupling constant, pionic atoms, and the Delta resonance width.
Arndt Richard A.
Pavan Marcello M.
Strakovsky Igor I.
Workman Ron L.
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