Strong evidence for nucleon resonances near 1900\,MeV

Abstract

Data on the reaction $\gamma p\to K^{+}\Lambda$ from the CLAS experiments are used to derive the leading multipoles, $E_{0+}$, $M_{1-}$, $E_{1+}$, and $M_{1+}$, 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 which 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 photo-induced reactions within the Bonn-Gatchina (BnGa) 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.

4 pages, 2 figures

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• Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data
• Electromagnetic Transition Form Factors of Baryon Resonances
• Photo- and Electrocouplings of Nucleon Resonances
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
• Spectral function of the ${\eta }^{\prime }$ meson in nuclear medium based on phenomenological models
• Application of the single-channel, single-energy AA/PWA method to $K^{+}\Lambda$ photoproduction
• Polarization observables in double neutral pion photoproduction
• Laurent+Pietarinen Partial Wave Analysis