P-wave excited baryons from pion- and photo-induced hyperon production

Abstract

We report evidence for $N(1710)P_{11}$, $N(1875)P_{11}$, $N(1900)P_{13}$, $\Delta (1600)P_{33}$, $\Delta (1910)P_{31}$, and $\Delta (1920)P_{33}$, and find indications that $N(1900)P_{13}$ might have a companion state at 1970\,MeV. The controversial $\Delta (1750)P_{31}$ is not seen. The evidence is derived from a study of data on pion- and photo-induced hyperon production, but other data are included as well. Most of the resonances reported here were found in the Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon (CM) analyses but were challenged recently by the Data Analysis Center at GWU. Our analysis is constrained by the energy independent $\pi N$ scattering amplitudes from either KH84 or GWU. The two $\pi N$ amplitudes from KH84 or GWU, respectively, lead to slightly different $\pi N$ branching ratios of contributing resonances but the debated resonances are required in both series of fits.

22 pages, 28 figures. Some additional sets of data are added

References in corpus (32)

• Unitary Isobar Model - MAID2007
• Extended Partial-Wave Analysis of piN Scattering Data
• Analytic properties of the scattering amplitude and resonances parameters in a meson exchange model
• Dynamical Coupled-Channel Model of $\pi N$ Scattering in the W $\le$ 2 GeV Nucleon Resonance Region
• Evidence that the Y(4660) is a f_0(980)psi' bound state
• New results on the Roper resonance and the P_{11} partial wave
• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• Measurement of the reaction gamma p --> K0 Sigma+ at photon energies up to 2.6 GeV
• eta-photoproduction in the resonance energy region
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• Measurement of beam-recoil observables Ox, Oz and target asymmetry for the reaction gamma p -> K Lambda
• A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton
• The reaction pi+ p --> K+ Sigma+ in a unitary coupled-channels model
• Baryon resonances and polarization transfer in hyperon photoproduction
• Partial decay widths of baryons in the spin-momentum operator expansion method
• Nucleon resonance decay by the $K^0{\Sigma }^{+}$ channel
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Regge-plus-resonance treatment of the p(gamma,K^+)Sigma^0 and p(gamma,K^0)Sigma^+ reactions at forward kaon angles
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• Nucleon resonances in πN scattering up to energies \sqrt(s) < 2.0 GeV
• Electroproduction of kaons from the proton in a Regge-plus-resonance approach
• Singularity structure of the pi N scattering amplitude in a meson-exchange model up to energies W < 2.0 GeV
• The piN --> etaN data demand the existence of N(1710) P11 resonance reducing the 1700 MeV continuum ambiguity
• Regge approach to charged-pion photoproduction at invariant energies above 2 GeV
• Model-independent resonance parameter extraction using the trace of K and T matrices
• Resonance parameters from K-matrix and T-matrix poles
• Regge-plus-resonance predictions for kaon photoproduction from the neutron
• Analysis of recent eta photoproduction data
• Channel coupling effects in $\rho$-meson photoproduction
• Backward asymmetry measurements in the elastic pion-proton scattering at resonance energies

Cited by in corpus (6)

• Relevance of complex branch points for partial wave analysis
• A Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model
• Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI
• Origin of the second peak in the cross section of the $K^{+}\Lambda$ photoproduction
• Electromagnetic production of $K\Sigma$ on the nucleon near threshold
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton