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- Title
The impact of K+Λ photoproduction on the resonance spectrum.
- Authors
Rönchen, D.; Döring, M.; Meißner, U. G.
- Abstract
The Jülich-Bonn coupled-channel framework is extended to K+Λ<inline-graphic></inline-graphic> photoproduction. The spectrum of nucleon and Δ<inline-graphic></inline-graphic> resonances is extracted from simultaneous fits to several pion-induced reactions in addition to pion, eta and K+Λ<inline-graphic></inline-graphic> photoproduction off the proton. More than 40000 data points up to a center-of-mass energy of E∼2.3<inline-graphic></inline-graphic> GeV including recently measured double-polarization observables are analyzed. The influence of the γp→K+Λ<inline-graphic></inline-graphic> channel on the extracted resonance parameters and the appearance of states not seen in other channels is investigated. The Jülich-Bonn model includes effective three-body channels and guarantees unitarity and analyticity, which is a prerequisite for a reliable determination of the resonance spectrum in terms of poles and residues.
- Subjects
OPTICAL resonance; QUANTUM chromodynamics; WAVE analysis; QUARK models; PARTICLES (Nuclear physics)
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2018, Vol 54, Issue 6, p1
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2018-12541-3