Journal Article

PreJuSER-28834

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pion-nucleon-scattering inside the Mandelstam Triangle

Büttiker, P.FZJ* ; Meissner, U. G.FZJ*

2000
North-Holland Publ. Co. Amsterdam

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Abstract: We study the third order pion-nucleon scattering amplitude obtained from heavy baryon chiral perturbation theory inside the Mandelstam triangle. We reconstruct the pion-nucleon amplitude in the unphysical region by use of dispersion relations and determine the pertinent low-energy constants by a fit to this amplitude. A detailed comparison with values obtained from phase shift analysis is given. Our analysis leads to a pion-nucleon sigma-term of sigma(0) = 40 MeV based on the Karlsruhe partial wave analysis. We have repeated the same procedure: using the latest solution of the VPI group and find a much larger value for sigma(0). (C) 2000 Elsevier Science B.V. All rights reserved.

Keyword(s): J ; pion-nucleon scattering (auto) ; chiral perturbation theory (auto) ; dispersion relations (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut für Kernphysik (IKP)

Research Program(s):

1. Theoretische Kernphysik (20.80.0)

Appears in the scientific report 2000

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