期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.062004
关键词
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资金
- Deutsche Forschungsgemeinschaft [SFB/TR110, SFB1044]
- U.S. Department of Energy
- U.S. National Science Foundation
- U.K. Science and Technology Facilities Council [ST/L005719/1]
- Russian Science Foundation [RSF 16-12-10267]
- Science and Technology Facilities Council [ST/P004458/1, ST/L005719/1] Funding Source: researchfish
- Russian Science Foundation [16-12-10267] Funding Source: Russian Science Foundation
- STFC [ST/L005719/1, ST/P004458/1] Funding Source: UKRI
Data on the reaction gamma p -> K+Lambda 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 J(P) = 1/2(-), 1/2(+), and 3/2(+) in the region at about 1.9 GeV.
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