Nucleon resonances and processes involving strange particles

Details Nucleon resonances and processes involving strange particles Nucleon resonances and processes involving strange particles

2004-06-17

arxiv.org/abs/nucl-th/0406057v1

Physics

Nuclear Physics

Nuclear Theory

5 pages, 2 figures, contribution to the NSTAR 2004 conference in Grenoble

Scientific paper

An existing single resonance model with S11, P11 and P13 Breit-Wiegner resonances in the s-channel has been re-applied to the old pi N --> K Lambda data. It has been shown that the standard set of resonant parameters fails to reproduce the shape of the differential cross section. The resonance parameter determination has been repeated retaining the most recent knowledge about the nucleon resonances. The extracted set of parameters has confirmed the need for the strong contribution of a P11(1710) resonance. The need for any significant contribution of the P13 resonance has been eliminated. Assuming that the Baker. et al data set\cite{Bak78} is a most reliable one, the P11 resonance can not but be quite narrow. It emerges as a good candidate for the non-strange counter partner of the established pentaquark anti-decuplet.

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