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The importance of 'pi N -> K Lambda' process for the pole structure of the P11 partial wave T-matrix in the coupled channel pion-nucleon partial wave analysis


Zauner, Branimir; Ceci, Saša; Švarc, Alfred
The importance of 'pi N -> K Lambda' process for the pole structure of the P11 partial wave T-matrix in the coupled channel pion-nucleon partial wave analysis // Proceedings of the Workshop on the Physics of Excited Nucleons Nstar2005 / Capstick, Simon ; Crede, Volker ; Eugenio, Paul (ur.).
New Jersey: World Scientific, 2006. str. 380-384 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
The importance of 'pi N -> K Lambda' process for the pole structure of the P11 partial wave T-matrix in the coupled channel pion-nucleon partial wave analysis

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

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 / Capstick, Simon ; Crede, Volker ; Eugenio, Paul - New Jersey : World Scientific, 2006, 380-384

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; K Lambda production

Sažetak
The pole structure of the P11 pion-nucleon partial wave is examined with the emphasis on the 1700 MeV energy domain. The mechanism of eliminating continuum ambiguities in pion-nucleon partial wave analyses by using the coupled channel formalism, presented elsewhere for the piN -> etaN channel, is applied for the piN -> KLambda channel, with the aim to clarify the issue whether physical reality requires none (VPI/GWU), one (KH80, CMB, Kent, Pittsburgh/ANL, Giessen), or possibly two (Zagreb) poles of the partial wave T-matrix in the 1700 MeV range. The role of second inelastic channel for resolving the dilemma is demonstrated. The quark structure of the possible resonant state(s) is discussed pointing out the fact that the crypto-exotic pentaquark state, if exists, should almost certainly reveal its presence in this channel. Regardless of the existence of the genuine pentaquark state, the very important issue of the number of P11 resonances is an important question to be solved, because the number of P11 resonances, presently predicted by the three quark model, is in clear disagreement with the experimental reality. It is pointed out that the experiments for the piN -> KLambda and piN -> KSigma channel, extremely important for the 1700 MeV range, are old and inconclusive so an urgent need for remeasuring that channel is stressed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
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Projekt / tema
0098009

Ustanove
Institut "Ruđer Bošković", Zagreb