New Result for the Pion-Nucleon Sigma Term from an Updated VPI/GW Pion-Nucleon Partial-Wave and Dispersion Relation Analysis

Blacksburg; Cambridge; D.C.); I.I Strakovsky; MA ; (2) Dept. of Physics; M.I.T.; M.M. Pavan (1); R.A. Arndt (2); R.L. Workman (3) ((1) Lab for Nuclear Science; The George Washington University

arxiv: nucl-th/9912034 · v1 · pith:CFMOIFZ3new · submitted 1999-12-15 · ⚛️ nucl-th

New Result for the Pion-Nucleon Sigma Term from an Updated VPI/GW Pion-Nucleon Partial-Wave and Dispersion Relation Analysis

M.M. Pavan (1) , R.A. Arndt (2) , I.I Strakovsky , R.L. Workman (3) ((1) Lab for Nuclear Science , M.I.T. , Cambridge , MA ; (2) Dept. of Physics , V.P.I.

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Blacksburg VA ; (3) Dept. of Physics The George Washington University Washington D.C.)

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keywords pion-nucleonresultsigmaanalysisdispersionpartial-waverelationterm

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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.

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New Result for the Pion-Nucleon Sigma Term from an Updated VPI/GW Pion-Nucleon Partial-Wave and Dispersion Relation Analysis

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