Photoproduction of eta mesons off protons for photon energies from 0.75 GeV to 3 GeV

Abstract

Total and differential cross sections for the reaction p(gamma, eta)p have been measured for photon energies in the range from 750 MeV to 3 GeV. The low-energy data are dominated by the S11 wave which has two poles in the energy region below 2 GeV. Eleven nucleon resonances are observed in their decay into p eta. At medium energies we find evidence for a new resonance N(2070)D15 with (mass, width) = (2068+-22, 295+-40) MeV. At photon energies above 1.5 GeV, a strong peak in forward direction develops, signalling the exchange of vector mesons in the t channel.

LaTeX, 4 pages including 4 eps-figures, submitted to Phys. Rev. Lett. The publication of hep-ex/0311045 is accompanied by hep-ex/0407022 on photoproduction of neutral pions, submitted to Phys. Rev. Lett. Fits published in the latest version are based on additional data, new beam asymmetry data from GRAAL are included, for instance. The data demanded more resonant contributions which were studied in detail. PWA reference added

References in corpus (6)

• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Analysis of Pion Photoproduction Data
• A reggeized model for eta and eta-prime photoproduction
• Differential cross section measurement of eta photoproduction on the proton from threshold to 1100 MeV
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• Excitation of S11 resonances in pion scattering and pion photoproduction on the proton

Cited by in corpus (88)

• Baryon spectroscopy
• Progress Toward Understanding Baryon Resonances
• Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)
• Photoproduction of $\eta$ and $\eta \prime$ Mesons off Protons
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Differential cross sections for the reactions gamma p-> p eta and gamma p -> p eta-prime
• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• Photoproduction of Baryons Decaying into N pi and N eta
• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• Q^2 Dependence of the S_{11}(1535) Photocoupling and Evidence for a P-wave resonance in eta electroproduction
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• eta-photoproduction in the resonance energy region
• Quasi-free photoproduction of eta-mesons of the neutron
• Eta-meson production in the resonance energy region
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• N* and Delta* decays into N pi0 pi0
• On the cross section ratio sigma_n/sigma_p in eta photoproduction
• Quasi-free photoproduction of eta-mesons off the deuteron
• Partial decay widths of baryons in the spin-momentum operator expansion method
• Baryon resonances and polarization transfer in hyperon photoproduction
• Measurement of the Slope Parameter $\alpha$ for the $\eta \to 3{\pi }^0$ decay with the Crystal Ball detector at the Mainz Microtron (MAMI-C)
• Electroexcitation of nucleon resonances at Q^2=0.65 GeV/c^2 from a combined analysis of single- and double-pion electroproduction data
• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Nucleon resonance decay by the $K^0{\Sigma }^{+}$ channel
• Quasifree photoproduction of $\eta$ mesons off protons and neutrons
• Light Baryon Spectroscopy
• Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance
• Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis
• Photoproduction of mesons off nuclei
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• A new $N^{\ast }(1675)$ resonance in the $\gamma N\to \eta N$ reaction
• Low-energy etaN interactions: scattering lengths and resonance parameters
• Strong decays of baryons and missing resonances
• Finite-Energy Sum Rules in Eta Photoproduction off the Nucleon
• Photon beam asymmetry $\Sigma$ for $\eta$ and ${\eta }^{\prime }$ photoproduction from the proton
• P-wave excited baryons from pion- and photo-induced hyperon production
• $\eta$ photoproduction on the quasi-free nucleons in the chiral quark model
• Partial decay widths of baryons in the spin-momentum operator expansion method
• ${\eta }^{\prime }$ photoproduction on the nucleons in the quark model
• Photoproduction of ${\eta }^{\prime }$-mesons off the deuteron
• Study of $\eta$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model
• Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV
• Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV
• Quasi-free photoproduction of eta-mesons off 3He nuclei
• Relativistic quark-diquark model of baryons with a spin-isospin transition interaction
• New data on $\vec{\gamma }\vec{p}\to \eta p$ with polarized photons and protons and their implications for $N^{\ast }\to N\eta$ decays
• Combined study of gamma p to eta p and pi-p to eta n in a chiral constituent quark approach
• Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons
• Exclusive photoproduction of $f_1(1285)$ meson off proton in the JLab kinematics
• Photoproduction of $\eta$-mesons off C and Cu nuclei for photon energies below 1.1 GeV
• Eta photoproduction off the neutron at GRAAL: Evidence for a resonant structure at W=1.67 GeV
• $\eta$ production off the proton in a Regge-plus-chiral quark approach
• Searching for the quark--diquark systematics of baryons composed by light quarks $q=u,d$
• Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
• Glueballs, Hybrids, Pentaquarks : Introduction to Hadron Spectroscopy and Review of Selected Topics
• eta photoproduction and N* resonances
• Recoil polarization and beam-recoil double polarization measurement of ηelectroproduction on the proton in the region of the S_{11}(1535) resonance
• Analysis of recent eta photoproduction data
• Channel coupling effects in $\rho$-meson photoproduction
• Toward a unified description of hadro- and photoproduction: S-wave pi- and eta-photoproduction amplitudes
• Chiral constituent quark model study of the process $\gamma p\to \eta p$
• Eta Photoproduction as a Test of the Extended Chiral Symmetry
• Photoproduction of pi0 omega off protons for E(gamma) < 3 GeV
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• Photoproduction of eta and etaprime mesons on the nucleon
• Eta and kaon production in a chiral quark model
• Energy dependent analysis of eta-meson photoproduction on protons and neutrons without background in the energy region up to 3.4 GeV
• Partial-wave analyses of $\gamma p\to \eta p$ \ and $\gamma n\to \eta n$ using a multichannel framework
• Primakoff effect in eta-photoproduction off protons
• Spectral-fluctuations test of the quark-model baryon spectrum
• Investigation of the anomaly in eta-photoproduction off the neutron
• Search for narrow resonances in $\pi p$ elastic scattering from the EPECUR experiment
• Photoproduction of $\eta$ mesons off the proton for $1.2<E_{\gamma }<4.7$ GeV using CLAS at Jefferson Laboratory
• Configuration Mixing of Quark States in Baryons
• Final remarks to our study of $\eta$-photoproduction on protons in the resonance region
• In-Medium Properties of Hadrons
• Open flavor strong decays
• Photoproductions of $f_1(1285)$ and ${\eta }^{\prime }(958)$ from the analysis of CLAS data with the Primakoff effect at high energies
• Spectral-statistics properties of the experimental and theoretical light baryon and meson spectra
• Exploration of hyperfine interaction between constituent quarks via eta productions
• Nuclear Reactions at Intermediate Energies
• Hadrons in Nuclei: Experiments and Perspectives
• Physics at ELSA