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Pregled bibliografske jedinice broj: 220768

Zbornik radova

Autori: Zauner, Branimir; Ceci, Saša; Švarc, Alfred
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
Izvornik: Proceedings of the Workshop on the Physics of Excited Nucleons Nstar2005 / Capstick, Simon ; Crede, Volker ; Eugenio, Paul (ur.). - 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.
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.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Cjeloviti rad (više od 1500 riječi)
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0098009
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://hadron.physics.fsu.edu/NSTAR2005/parallel3_pre.htm
Napomene:
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