2017/12/01 by A. V. Anisovich, V. Burkert, M. Hadžimehmedović +8 · 17 citations
Physics and Astronomy · #Amplitude #Complex plane #Energy (signal processing) #Invariant (physics) #Nuclear physics research studies #Plane (geometry) #Plane wave #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #Resonance (particle physics) #Scattering amplitude #nucl-ex
paper · pdf · doi:10.1140/epja/i2017-12443-x
published in The European Physical Journal A 53(12) (Springer Science+Business Media) · 18 pages, 12 figures
openalex publication_date 2017/12/01 · arxiv created 2017/12/20 · arxiv updated 2018/01/17 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
The two reactions γp→ K+Λ and π-p→ K0Λ are analyzed to determine the leading photoproduction multipoles and the pion-induced partial wave amplitudes in slices of the invariant mass. The multipoles and the partial-wave amplitudes are simultaneously fitted in a multichannel Laurent+Pietarinen model (L+P model), which determines the poles in the complex energy plane on the second Riemann sheet close to the physical axes. The results from the L+P fit are compared with the results of an energy-dependent fit based on the Bonn-Gatchina (BnGa) approach. The study confirms the existence of several poles due to nucleon resonances in the region at about 1.9 GeV with quantum numbers JP = 1/2+, 3/2+, 1/2-, 3/2-, 5/2-.