Pole positions and residues from pion photoproduction using the Laurent-Pietarinen expansion method (CROSBI ID 207790)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Švarc, Alfred ; Hadžimehmedović, Mirza, Osmanović, Hedim ; Stahov, Jugoslav ; Tiator, Lothar ; Workman, Ron
engleski
Pole positions and residues from pion photoproduction using the Laurent-Pietarinen expansion method
We applied a new approach to determine the pole positions and residues from pion photoproduction multipoles. The method is based on a Laurent expansion of the partial-wave T matrices, with a Pietarinen series representing the regular part of energy-dependent and single-energy photoproduction solutions. The method is applied to multipole fits generated by the MAID and GeorgeWashington University SAID (GWU-SAID) groups.We show that the number and properties of poles extracted from photoproduction data correspond very well to results from πN elastic data and values cited by the Particle Data Group (PDG). The photoproduction residues provide new information for the electromagnetic current at the pole position, which are independent of background parametrizations, which is not the case for the Breit-Wigner representation. Finally, we present the photodecay amplitudes from the current MAID and SAID solutions at the pole for all four-star nucleon resonances below W = 2 GeV.
baryon resonances ; poles ; Laurent+Pietarinen expansion
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
89
2014.
065208-1-065208-17
objavljeno
0556-2813
10.1103/PhysRevC.89.065208