The pion-nucleon Sigma term is definitely large: results from a G.W.U. analysis of pion nucleon scattering data

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dc.creatorPavan, M. M.
dc.creatorStrakovsky, I. I.
dc.creatorWorkman, R. L.
dc.creatorArndt, R. A.
dc.date2001-11-06
dc.date.accessioned2026-07-07T03:45:45Z
dc.date.available2026-07-07T03:45:45Z
dc.descriptionA 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=79$\pm$7 MeV was obtained, compared to the canonical value 64$\pm$8 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.
dc.description6 pages, 2 figures, menuproc.sty included. Plenary talk, Ninth International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, The George Washington University, Washington D.C., USA, July 26-31, 2001, to appear in the proceedings
dc.identifierhttps://arxiv.org/abs/hep-ph/0111066
dc.identifierhttp://arxiv.org/abs/hep-ph/0111066
dc.identifierPiN Newslett. 16 (2002) 110-115
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/41041
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe pion-nucleon Sigma term is definitely large: results from a G.W.U. analysis of pion nucleon scattering data
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