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Pregled bibliografske jedinice broj: 220709

The influence of inelastic channels upon the pole structure of partial wave T-matrices in the coupled channel pion-nucleon partial wave analysis


Ceci, Saša; Švarc, Alfred; Zauner, Branimir
The influence of inelastic channels upon the pole structure of partial wave T-matrices in the coupled channel pion-nucleon partial wave analysis // Proceedings of the Workshop on the Physics of Excited Nucleons Nstar2005 / Simon Capstick ; Volker Crede, Paul Eugenio (ur.).
New Jersey: World Scientific, 2006. str. 376-380 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
The influence of inelastic channels upon the pole structure of partial wave T-matrices in the coupled channel pion-nucleon partial wave analysis

Autori
Ceci, Saša ; Švarc, Alfred ; Zauner, Branimir

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Workshop on the Physics of Excited Nucleons Nstar2005 / Simon Capstick ; Volker Crede, Paul Eugenio - New Jersey : World Scientific, 2006, 376-380

Skup
NSTAR 2005 The Physics Of Excited Baryons

Mjesto i datum
Tallahassee, Florida, SAD., 12-15.10.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Coupled channel partial wave analysis; inelastic channels

Sažetak
The method of avoiding continuum ambiguities in a pion-nucleon partial wave analysis in the inelastic region by using the coupled channel formalism is discussed. The very number of poles of the analytic partial wave T-matrix, their position in the complex energy plane and their residues depend strongly on the number of channels used for constraining the free parameters of the model. The criteria for determining the minimal number of poles needed to describe the given input are discussed, and the procedure of increasing the number of poles necessary for simultaneously describing additional channels is introduced. The interplay of the pole structure and the number of inelastic channels is demonstrated for the P11 partial wave for the case of inclusion of pi N -> eta N channel into the coupled channel partial wave analysis in addition to the full pi N elastic data base. The N(1710) P11 resonance is a clear example when the continuum ambiguity, present when solely the pi N elastic scattering data are analyzed, is spontaneously eliminated by increasing the number of resonant states when the piN -> eta N channel data are included in the framework of coupled channel partial wave analysis formalism.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
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Projekt / tema
0098009

Ustanove
Institut "Ruđer Bošković", Zagreb