Naslov
Strong Evidence for Nucleon Resonances near 1900 MeV

Autori
Anisovich, A. V. ; Burkert, V. ; Hadžimehmedović, M. ; Ireland, D. G. ; Klempt, E. ; Nikonov, V. A. ; Omerović, R. ; Osmanović, H. ; Sarantsev, A. V. ; Stahov, J. ; Švarc, A. ; Thoma, U.

Izvornik
Physical Review Letters (0031-9007) 119 (2017); 062004-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, pismo, znanstveni

Ključne riječi
strange particle photoproduction, N* resonances

Sažetak
Data on the reaction γp → KΛ from the CLAS experiments are used to derive the leading multipoles, E0+, M1−, E1+, and M1+, from the production threshold to 2180 MeV in 24 slices of the invariant mass. The four multipoles are determined without any constraints. The multipoles are fitted using a multichannel L + P model that allows us to search for singularities and to extract the positions of poles on the complex energy plane in an almost model-independent method. The multipoles are also used as additional constraints in an energy-dependent analysis of a large body of pion and photoinduced reactions within the Bonn-Gatchina partial wave analysis. The study confirms the existence of poles due to nucleon resonances with spin parity JP = 1/2−, 1/2+, and 3/2' in the region at about 1.9 GeV.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA