Nucleon resonances and processes involving strange particles
AbstractAn existing single resonance model with S11, P11 and P13 Breit-Wiegner resonances in the s-channel has been re-applied to the oldπN →KΛ data. It has been shown that the standard set of reso-nant parameters fails to reproduce the shape of the diﬀerential crosssection. The resonance parameter determination has been repeatedretaining the most recent knowledge about the nucleon resonances.The extracted set of parameters has conﬁrmed the need for the strongcontribution of a P11(1710) resonance. The need for any signiﬁcantcontribution of the P13 resonance has been eliminated. Assumingthat the Baker. et al data set[1] is a most reliable one, the P11 reso-nance can not but be quite narrow. It emerges as a good candidate forthe non-strange counter partner of the established pentaquark anti-decuplet. In spite of the fact that the experimental data for the process πN →KΛ,which show a distinct peeking around the energy range of 1700 MeV, areavailable for quite some time[1, 2] the existence of a P