Untersuchung der ersten Nukleonresonanzen in der PionNukleon Streuung
Untersuchung der ersten Nukleonresonanzen in der PionNukleon Streuung
In the present work we study the first excited states of the nucleon by investigating $\pi$N scattering from the threshold up to c.m, energies of 1.9 GeV. Therefore, we develop a meson exchange model which describes $\pi$N scattering in a system of the coupled reaction channels $\pi$N, $\sigma$N, $\...
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Personal Name(s):  Krehl, O. (Corresponding author) 

Contributing Institute: 
Publikationen vor 2000; PRE2000; Retrocat 
Imprint: 
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1999

Physical Description: 
III, 145 p. 
Document Type: 
Report Book 
Research Program: 
Addenda 
Series Title: 
Berichte des Forschungszentrums Jülich
3692 
Link: 
OpenAccess OpenAccess 
Publikationsportal JuSER 
In the present work we study the first excited states of the nucleon by investigating $\pi$N scattering from the threshold up to c.m, energies of 1.9 GeV. Therefore, we develop a meson exchange model which describes $\pi$N scattering in a system of the coupled reaction channels $\pi$N, $\sigma$N, $\pi \Delta$, $\rho$N, $\pi$N*(1520), and $\eta$N. Within this model a detailed analysis of the resonance N*(1440) is performed. We find this resonance to be generated dynamically by the strong coupling to the $\sigma$N channel. By using the speedplot method resonance parameters are extracted. Within a simplified model we demonstrate, that the large inelasticity, which is connected with the resonance N*(1440), is generated by the often disregarded $\sigma$N channel and that the $\pi \Delta$ channel is less important. Furthermore, we investigate the resonance N*(1520). We find, that it is indeed possible to generate this resonance as $\rho$N bound state as suggested in earlier publications, but this is not in agreement with other observables. The importance of the resonance N*(1520) as a contribution to the differential cross section of the reaction $\pi$N $\rightarrow$ $\eta$N is seen as an interference, which leads to a strong angular dependence in this observable. 