The pion-nucleon Sigma term is definitely large: results from a G.W.U. analysis of pion nucleon scattering data
M. M. Pavan, I. I. Strakovsky, R. L. Workman, R. A. Arndt
Abstract
A new result for the pion nucleon Sigma term from a George Washington University/TRIUMF group analysis of pion nucleon data is presented. The value Sigma=797 MeV was obtained, compared to the canonical value 648 MeV found by Koch. The difference is explained simply by the PSI pionic hydrogen value for a(pi -p), the latest results for the πNN coupling onstant, and a narrower Delta resonance. Many systematic effects have been investigated, including Coulomb corrections, and database changes, and our results are found to be robust. In the standard interpretation, our value of Sigma implies a nucleon strangeness fraction y/2~0.23. The implausibility of such a large strange component suggests that the relationship between Sigma and nucleon strangeness ought to be re-examined.
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