Hyperon II: Properties of excited hyperons

Abstract

We report properties of $\Lambda$ and $\Sigma$ hyperon resonances formed in $K^{-}$ induced reactions. Special emphasis is laid on the analysis of the three-body final states $2{\pi }^0\Lambda$ and $2{\pi }^0\Sigma$ and of the quasi-two-body final states $\pi \Lambda (1520)$, $\bar{K}\Delta (1232)$, $\pi \Sigma (1385)$, ${\bar{K}}^{\ast }N$, and $\omega \Lambda$. We give pole positions of $\Lambda$ and $\Sigma$ hyperon resonances and transition residues from the $K^{-}p$ initial to various final states as well as Breit-Wigner masses and widths and decay branching ratios. Twenty resonances and "bumps" reported in the Review of Particle Physics are not required in our fits, evidence for five new resonances is reported. The observed mass spectrum is compared to the spectrum calculated in the Bonn quark model. Three spin doublets, six $\Lambda$ hyperons, are tentatively assigned to the SU(3) singlet system.

arXiv comment18 pages, 10 Figures, 3 Tables

References in corpus (28)

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• Non perturbative chiral approach to s-wave \bar{K}N interactions
• Chiral Dynamics of the Two Λ(1405) States
• Chiral Dynamics and the Low Energy Kaon-Nucleon Interaction
• A New Measurement of Kaonic Hydrogen X rays
• The nature of the Lambda(1405) resonance in chiral dynamics
• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Chiral SU(3) theory of antikaon-nucleon interactions with improved threshold constraints
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• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• New insights into antikaon-nucleon scattering and the structure of the Lambda(1405)
• Kaonic hydrogen X-ray measurement in SIDDHARTA
• Dynamical coupled-channels model of $K^{-}p$ reactions (I): Determination of partial-wave amplitudes
• Dynamical coupled-channels model of $K^{-}p$ reactions (II): Extraction of ${\Lambda }^{\ast }$ and ${\Sigma }^{\ast }$ hyperon resonances
• Spin and parity measurement of the Lambda(1405) baryon
• Pion photoproduction off the proton in a gauge-invariant chiral unitary framework
• Multichannel parametrization of $\bar{K}N$ scattering amplitudes and extraction of resonance parameters
• The pole structure of the Lambda(1405) in a recent QCD simulation
• Partial-wave analysis of $\bar{K}N$ scattering reactions
• Construction of a local barK N-pi Sigma-pi Lambda potential and composition of the Lambda(1405)
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Toward establishing low-lying $\Lambda$ and $\Sigma$ hyperon resonances with the $\bar{K}+d\to \pi +Y+N$ reaction
• The Lambda(1405) state in a chiral unitary approach with off-shell corrections to dimensional regularized loop functions
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Cited by in corpus (28)

• 50 Years of Quantum Chromodynamics
• Review of the $\mathbf{\Lambda }$(1405): A curious case of a strange-ness resonance
• QCD and the Strange Baryon Spectrum
• Light Baryon Spectroscopy
• Review of the low-lying excited baryons ${\Sigma }^{\ast }(1/2^{-})$
• Measurement of Branching Fractions of ${\Lambda }_c^{+}\to \eta \Lambda {\pi }^{+}$, $\eta {\Sigma }^0{\pi }^{+}$, $\Lambda (1670){\pi }^{+}$, and $\eta \Sigma (1385{)}^{+}$
• Partial wave analysis of the charmed baryon hadronic decay ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}{\pi }^0$
• New insights into the pole parameters of the $\Lambda (1380)$, the $\Lambda (1405)$ and the $\Sigma (1385)$
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• $\Lambda$ and $\Sigma$ Excitations and the Quark Model
• Study ${\Xi }_c^{+}\to \Lambda {\bar{K}}^0{\pi }^{+}$ and search for the low-lying baryons $\Xi (1/2^{-})$ and $\Sigma (1/2^{-})$
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Structure of the $\mathbf{\Lambda }(1670)$ resonance
• Measurement of the ${\Lambda }_b^0\to \Lambda (1520){\mu }^{+}{\mu }^{-}$ differential branching fraction
• Observation of the $J/\psi$ and $\psi (3686)$ decays into $\eta {\Sigma }^{+}{\bar{\Sigma }}^{-}$
• Double-strangeness exchange reactions in a hybrid Regge-plus-resonance approach
• The odd-parity strange baryons $\Sigma ({\frac{1}{2}}^{-})$ below 1.8 GeV with Hamiltonian effective field theory
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• Role of ${\Sigma }^{\ast }(1/2^{-})$ baryons in ${\Lambda }_c\to \Lambda {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay
• The lightest flavor--singlet qqq baryons as witnesses to color
• Observation of the $\psi (3686)$ decays into ${\Sigma }^{+}{\bar{\Sigma }}^{-}\omega$ and ${\Sigma }^{+}{\bar{\Sigma }}^{-}\varphi$
• Amplitude analysis of the ${\Lambda }_b^0\to p{K}^{-}\gamma$ decay
• Study of the decay ψ(3686) \to Σ^{0}\barΣ^{0}ϕ
• First measurements of the branching fractions of $J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.$, $J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.$, and $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$
• Amplitude analysis and branching fraction measurement of $J/\psi \to \Lambda {\bar{\Sigma }}^0\eta +c.c$
• 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
• Observation of the decay $\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0\omega$