Dynamical coupled-channels model of $K^{-}p$ reactions (II): Extraction of ${\Lambda }^{\ast }$ and ${\Sigma }^{\ast }$ hyperon resonances

Abstract

Resonance parameters (pole masses and residues) associated with the excited states of hyperons, Lambda^* and Sigma^*, are extracted within a dynamical coupled-channels model developed recently by us [Phys. Rev. C 90, 065204 (2014)] through a comprehensive partial-wave analysis of the K^- p --> barK N, pi Sigma, pi Lambda, eta Lambda, K Xi data up to invariant mass W = 2.1 GeV. We confirm the existence of resonances corresponding to most, if not all, of the four-star resonances rated by the Particle Data Group. We also find several new resonances, and in particular propose a possible existence of a new narrow J^P=3/2^+ Lambda resonance that couples strongly to the eta Lambda channel. The J^P=1/2^- Lambda resonances located below the barK N threshold are also discussed. Comparing our extracted pole masses with the ones from a recent analysis by the Kent State University group, some significant differences in the extracted resonance parameters are found, suggesting the need of more extensive and accurate data of K^- p reactions including polarization observables to eliminate such an analysis dependence of the resonance parameters. In addition, the determined large branching ratios of the decays of high-mass resonances to the pi Sigma^* and barK^* N channels also suggest the importance of the data of 2 --> 3 reactions such as K^- p --> pi pi Lambda and K^- p --> pi barK N. Experiments on measuring cross sections and polarization observables of these fundamental reactions are highly desirable at hadron beam facilities such as J-PARC for establishing the Lambda^* and Sigma^* spectrum.

25 pages, 8 figures. Version to appear in Physical Review C

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Cited by in corpus (43)

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• Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region
• Hyperon II: Properties of excited hyperons
• The pole structure of the Lambda(1405) in a recent QCD simulation
• Nucleon resonances in $\gamma p\to K^{\ast +}\Lambda$
• Hyperon resonances coupled to pseudoscalar- and vector-baryon channels
• Spectrum and structure of octet and decuplet baryons and their positive-parity excitations
• Visible narrow cusp structure in ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$ enhanced by triangle singularity
• S- and p-wave structure of $S=-1$ meson-baryon scattering in the resonance region
• Towards the Minimal Spectrum of Excited Baryons
• Numerical calculation of the decay widths, the decay constants, and the decay energy spectra of the resonances of the delta-shell potential
• Measurement of Branching Fractions of ${\Lambda }_c^{+}\to \eta \Lambda {\pi }^{+}$, $\eta {\Sigma }^0{\pi }^{+}$, $\Lambda (1670){\pi }^{+}$, and $\eta \Sigma (1385{)}^{+}$
• Hyperon I: Partial wave amplitudes for $K^{-}p$ scattering
• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
• Toward establishing low-lying $\Lambda$ and $\Sigma$ hyperon resonances with the $\bar{K}+d\to \pi +Y+N$ reaction
• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Low-energy $\eta$-nucleon interaction studied with $\eta$ photoproduction off the deuteron
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Hyperon production in ${\Lambda }_c^{+}\to K^{-}p{\pi }^{+}$ and ${\Lambda }_c^{+}\to K_S^{0}p{\pi }^0$
• Photo-production of lowest ${\Sigma }_{1/2^{-}}^{\ast }$ state within the Regge-effective Lagrangian approach
• Two-body wave functions and compositeness from scattering amplitudes: II. Application to the physical $N^{\ast }$ and ${\Delta }^{\ast }$ resonances
• Photoproduction $\gamma p\to K^{\ast +}\Lambda$ in a Reggeized model
• How does the $X(3872)$ show up in $e^{+}{e}^{-}$ collisions: dip versus peak
• The odd-parity strange baryons $\Sigma ({\frac{1}{2}}^{-})$ below 1.8 GeV with Hamiltonian effective field theory
• Analysis of ${\Sigma }^{\ast }$ via isospin selective reaction $K_{L}p\to {\pi }^{+}{\Sigma }^0$
• Measurements of Born Cross Sections for $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2595{)}^{-}+c.c.$ and $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2625{)}^{-}+c.c.$ at $\sqrt{s}=$4918.0 and 4950.9 MeV
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Amplitude analysis of $\bar{K}N$ scattering
• Studying ${\Lambda }^{\ast }$ resonances in the $p\bar{p}\to \Lambda \bar{\Lambda }\eta$ reaction
• Light-quark baryon spectroscopy within ANL-Osaka dynamical coupled-channels approach
• Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum
• Light-quark baryon spectroscopy from ANL-Osaka dynamical coupled-channels analysis
• Complex phase structure of the meson-baryon $T$-matrix
• Dynamical coupled-channels approach to electroweak meson productions on nucleon and deuteron
• The $\Lambda (1405)$ resonance as a genuine three-quark or molecular state
• Low-lying $\Lambda$ and $\Sigma$ resonances studied with the forward $K^{\ast }$ productions off the proton induced by a high-momentum $\pi$ beam
• Role of the $\Lambda (1600)$ in the $K^{-}p\to \Lambda {\pi }^0{\pi }^0$ reaction
• Amplitude analysis and branching fraction measurement of $J/\psi \to \Lambda {\bar{\Sigma }}^0\eta +c.c$
• Establishing mass spectrum of $S=-1$ hyperon resonances via a dynamical coupled-channels analysis of $K^{-}p$ reactions