Journal Article

PreJuSER-29008

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png What is the structure of the roper resonance?

Krehl, O. ; Hanhart, C.FZJ* ; Krewald, S.FZJ* ; Speth, J.FZJ*

2000
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/2384

Abstract: We investigate the structure of the nucleon resonance N*(1440) (Roper) within a coupled-channel meson exchange model for pion-nucleon scattering. The coupling to pi pi N states is realized effectively by the coupling to the sigma N, pi Delta, and rho N channels. The interaction within and between these channels is derived from an effective Lagrangian based on a chirally symmetric Lagrangian, which is supplemented by well known terms for the coupling of the Delta isobar, the omega meson, and the "sigma," which is the name given here to the strong correlation of two pions in the scalar-isoscalar channel. In this model the Roper resonance can be described by meson-baryon dynamics alone; no genuine N*(1440) (three quark) resonance is needed in order to fit pi N phase shifts and inelasticities.

Keyword(s): J

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
Notes: This version is available at the following Publisher URL: http://prc.aps.org

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