High statistics study of the reaction $\gamma p\to p{\pi }^0\eta$

Abstract

Photoproduction off protons of the $p{\pi }^0\eta$ three-body final state was studied with the Crystal Barrel/TAPS detector at the electron stretcher accelerator ELSA at Bonn for incident energies from the ${\pi }^0\eta$ production threshold up to 2.5\,GeV. Differential cross sections and the total cross section are presented. The use of linearly polarized photons gives access to the polarization observables $\Sigma$, $I^s$ and $I^c$, the latter two characterize beam asymmetries in case of three-body final states. $\Delta (1232)\eta$, $N(1535)1/2^{-}\pi$, and $p{a}_0(980)$ are the dominant isobars contributing to the reaction. The partial wave analysis confirms the existence of some nucleon and $\Delta$ resonances for which so far only fair evidence was reported. A large number of decay modes of known nucleon and $\Delta$ resonances is presented. It is shown that detailed investigations of decay branching ratios may provide a key to unravelling the structure of nucleon and $\Delta$ resonances.

Submitted to EPJA, 27 pages, 32 figures, 6 tables

References in corpus (54)

• Chiral Dynamics in Nucleons and Nuclei
• Linear Confinement and AdS/QCD
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Exotica
• Hadronic Spectra and Light-Front Wavefunctions in Holographic QCD
• Hadronic Spectrum of a Holographic Dual of QCD
• Extended Partial-Wave Analysis of piN Scattering Data
• Baryon spectroscopy
• 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
• Progress Toward Understanding Baryon Resonances
• What is the structure of the Roper resonance?
• Analytic properties of the scattering amplitude and resonances parameters in a meson exchange model
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces II. The strange baryon spectrum
• The $S_{11}-N$(1535) and $-N$(1650) Resonances in Meson-Baryon Unitarized Coupled Channel Chiral Perturbation Theory
• Restoration of chiral and $U(1{)}_A$ symmetries in excited hadrons
• Chiral unitary meson-baryon dynamics in the presence of resonances: Elastic pion-nucleon scattering
• Partial wave decomposition of pion and photoproduction amplitudes
• Hybrid Baryons in QCD
• Baryon Spectra and AdS/CFT Correspondence
• The antinucleon-nucleon interaction at low energy : annihilation dynamics
• Linear square-mass trajectories of radially and orbitally excited hadrons in holographic QCD
• Parity doublets and chiral symmetry restoration in baryon spectrum
• Chiral dynamics in the gamma p --> pi^0 eta p and gamma p --> pi^0 K^0 Sigma^+ reactions
• Polarization Observables for Two-Pion Production off the Nucleon
• N* and Delta* decays into N pi0 pi0
• Electroexcitation of the Roper resonance for 1.7 < Q2 < 4.5 GeV2 in ep -> enpi+
• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Partial decay widths of baryons in the spin-momentum operator expansion method
• Diquark correlations in baryon spectroscopy and holographic QCD
• Chiral multiplets of excited mesons
• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Photoproduction of pi^0 eta on protons and the Delta(1700)D_{33} resonance
• Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton
• The role of the background in the extraction of resonance contributions from meson-baryon scattering
• Photoproduction of pi0-mesons off protons from the Delta(1232) region to E(gamma) = 3 GeV
• Evidence for a parity doublet Delta(1920)P_{33} and Delta(1940)D_{33}$ from γp\to pπ^0η
• P-wave excited baryons from pion- and photo-induced hyperon production
• Photoproduction of meson pairs: First measurement of the polarization observable I^s
• Nucleon resonances in the fourth resonance region
• Hybrid and Conventional Baryons in the Flux-Tube Model
• Baryon photo-decay amplitudes at the pole
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Photoproduction of Neutral Pions off Protons
• Evidence for a spin-quartet of nucleon resonances at 2\,GeV
• Chiral restoration in excited nucleons versus SU(6)
• Probing the infrared quark mass from highly excited baryons
• Sign ambiguity in the K Sigma channel
• Polarization observables in ${\pi }^0\eta$-photoproduction on the proton
• Evidence for a negative-parity spin-doublet of nucleon resonances at 1.88\,GeV
• Review on dynamically generated resonances

Cited by in corpus (46)

• Threshold cusps and triangle singularities in hadronic reactions
• 50 Years of Quantum Chromodynamics
• Eta photoproduction in a combined analysis of pion- and photon-induced reactions
• High statistics study of the reaction $\gamma p\to p2{\pi }^0$
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• The impact of ${\mathbf{K}}^{+}\mathbf{\Lambda }$ photoproduction on the resonance spectrum
• Measurement of pi^0 photoproduction on the proton at MAMI C
• Photoproduction of ω Mesons off the Proton
• First results on nucleon resonance photocouplings from the $\gamma p\to {\pi }^{+}{\pi }^{-}p$ reaction
• Triangle singularity mechanism for the $pp\to {\pi }^{+}d$ fusion reaction
• The polarization observables T, P, and H and their impact on $\gamma p\to p{\pi }^0$ multipoles
• $N^{\ast }$ decays to $N\omega$ from new data on $\gamma p\to \omega p$
• Abnormal isospin violation and $a_0-f_0$ mixing in the $D_s^{+}\to {\pi }^{+}{\pi }^0{a}_0(980)(f_0(980))$ reactions
• Role of a triangle singularity in the $\pi \Delta$ decay of the $N(1700)(3/2^{-})$
• Role of a triangle singularity in the $\pi N(1535)$ contribution to $\gamma p\to p{\pi }^0\eta$
• Triangle singularity in the $B^{-}\to K^{-}{\pi }^{0}X(3872)$ reaction and sensitivity to the $X(3872)$ mass
• Differential Cross Section Measurements for $\gamma n\to {\pi }^{-}p$ Above the First Nucleon Resonance Region
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
• Photoproduction ofeta-pi pairs off nucleons and deuterons
• Observation of the $p{\eta }^{\prime }$ Cusp in the New Precise Beam Asymmetry $\Sigma$ Data for $\gamma p\to p\eta$
• Double-polarization observable G in neutral-pion photoproduction off the proton
• The $a_0(980)$ in the single Cabibbo-suppressed process ${\Lambda }_c\to {\pi }^0\eta p$
• Determining the dominant partial wave contributions from angular distributions of single- and double-polarization observables in pseudoscalar meson photoproduction
• $N^{\ast }\to N{\eta }^{\prime }$ decays from photoproduction of ${\eta }^{\prime }$-mesons off protons
• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
• Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E
• Resonance-like structure near the $\eta d$ threshold in the $\gamma d${$\to$}${\pi }^0\eta d$ reaction
• On hadron deformation: a model independent extraction of EMR from pion photoproduction data
• Observation of Narrow $N^{+}(1685)$ and $N^0(1685)$ Resonances in $\gamma N\to \eta \pi N$ Reactions
• Photon asymmetry measurements of $\overrightarrow{\gamma }\mathrm{p}\to {\pi }^0\mathrm{p}$ for E${}_{\gamma }$=320$-$650 MeV
• Measurement of polarisation observables in $K_s^0{\Sigma }^{+}$ photoproduction off the proton
• First measurement of target and beam-target asymmetries in the $\gamma p\to {\pi }^0\eta p$ reaction
• Helicity-dependent cross sections for the photoproduction of ${\pi }^0$ pairs from nucleons
• First measurement of helicity-dependent cross sections in pi0-eta photoproduction from quasi-free nucleons
• Minimal complete sets for two pseudoscalar meson photoproduction
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Theory of two-pion photo- and electroproduction off the nucleon
• Theoretical study of the $\gamma d\to {\pi }^0\eta d$ reaction
• Polarization observables in double neutral pion photoproduction
• Measurement of the beam-helicity asymmetry in photoproduction of ${\pi }^0\eta$ pairs on carbon, aluminum, and lead
• Possible ${\eta }^{\prime }d$ bound state and its $s$-channel formation in the $\gamma d\to \eta d$ reaction
• Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum
• Search for the $N$(1685) in $\eta \pi$-Photoproduction