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.

arXiv comment4 pages, 2 figures

References in corpus (36)

• Diquarks and Exotic Spectroscopy
• Exotica
• Extended Partial-Wave Analysis of piN Scattering Data
• Excited state baryon spectroscopy from lattice QCD
• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Properties of baryon resonances from a multichannel partial wave analysis
• Unified description of light- and strange-baryon spectra
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces I. The non-strange baryon spectrum and ground-states
• Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab
• First Measurement of Beam-Recoil Observables Cx and Cz in Hyperon Photoproduction
• An interacting quark-diquark model of baryons
• Restoration of chiral and $U(1{)}_A$ symmetries in excited hadrons
• Parameterization dependence of T matrix poles and eigenphases from a fit to piN elastic scattering data
• Parity doublets and chiral symmetry restoration in baryon spectrum
• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• Determining pseudoscalar meson photo-production amplitudes from complete experiments
• Strange and nonstrange baryon spectra in the relativistic interacting quark-diquark model with a Gürsey and Radicati-inspired exchange interaction
• Eta-meson production in the resonance energy region
• Baryon resonances from chiral coupled-channel dynamics
• Chiral multiplets of excited mesons
• Isospin decomposition of $\gamma N\to N^{\ast }$ transitions within a dynamical coupled-channels model
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• Pion photoproduction off the proton in a gauge-invariant chiral unitary framework
• On the nature of the lowest $1/2^{-}$ baryon nonet and decuplet
• The complete experiment for photoproduction of pseudoscalar mesons in a truncated partial wave analysis
• Pole positions and residues from pion photoproduction using the Laurent+Pietarinen expansion method
• Effects of a spin-flavour dependent interaction on the baryon mass spectrum
• Poles of Karlsruhe-Helsinki KH80 and KA84 solutions extracted by using Laurent+Pietarinen method
• Information Content of Polarization Measurements
• Baryons in O(4) and Vibron Model
• Energy-independent PWA of the reaction $\gamma p\to K^{+}\Lambda$
• The reaction pi N to pi pi N in a meson-exchange approach
• Pole structure from energy-dependent and single-energy fits to $\pi N$ elastic scattering data
• Generalization of the model-independent Laurent-Pietarinen single-channel pole-extraction formalism to multiple channels
• Baryon transition form factors at the pole
• Study of ambiguities in ${\pi }^{-}p\to \Lambda K^0$ scattering amplitudes

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• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Kaon Photoproduction and the $\Lambda$ Decay Parameter ${\alpha }_{-}$
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• 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
• N* Structure and Strong QCD
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
• Pentaquark components in low-lying baryon 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
• Model selection for $K^{+}{\Sigma }^{-}$ photoproduction within isobar model
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• 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