Photocouplings at the Pole from Pion Photoproduction

Abstract

The reactions $\gamma p\to {\pi }^{0}p$ and $\gamma p\to {\pi }^{+}n$ are analyzed in a semi-phenomenological approach up to $E\sim 2.3$ GeV. Fits to differential cross section and single and double polarization observables are performed. A good overall reproduction of the available photoproduction data is achieved. The Jülich2012 dynamical coupled-channel model -which describes elastic $\pi N$ scattering and the world data base of the reactions $\pi N\to \eta N$, $K\Lambda$, and $K\Sigma$ at the same time - is employed as the hadronic interaction in the final state. The framework guarantees analyticity and, thus, allows for a reliable extraction of resonance parameters in terms of poles and residues. In particular, the photocouplings at the pole can be extracted and are presented.

37 pages, 31 figures. Angles of the photocouplings at the pole adapted to the convention of Phys. Rev. C 87, 068201 (2013)

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• Constraints on the chiral unitary $\bar{K}N$ amplitude from $\pi \Sigma K^{+}$ photoproduction data
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• The $\pi \pi \to \pi {\gamma }^{\star }$ amplitude and the resonant $\rho \to \pi {\gamma }^{\star }$ transition from lattice QCD
• Review of the $\mathbf{\Lambda }$(1405): A curious case of a strange-ness resonance
• Isospin decomposition of $\gamma N\to N^{\ast }$ transitions within a dynamical coupled-channels model
• Light Baryon Spectroscopy
• The impact of ${\mathbf{K}}^{+}\mathbf{\Lambda }$ photoproduction on the resonance spectrum
• Two-flavor Simulations of the $\rho (770)$ and the Role of the $K\bar{K}$ Channel
• Photon beam asymmetry $\Sigma$ for $\eta$ and ${\eta }^{\prime }$ photoproduction from the proton
• Kaon Photoproduction and the $\Lambda$ Decay Parameter ${\alpha }_{-}$
• First measurement of the helicity asymmetry $E$ in $\eta$ photoproduction on the proton
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Pole position of the $a_1(1260)$ resonance in a three-body unitary framework
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Model Selection for Pion Photoproduction
• First Measurement of the Polarization Observable E in the $\vec{p}(\vec{\gamma },{\pi }^{+})n$ Reaction up to 2.25 GeV
• Exploratory study of possible resonances in the heavy meson - heavy baryon coupled-channel interactions
• Dalitz plots and lineshape of $a_1(1260)$ from a relativistic three-body unitary approach
• Photo- and Electrocouplings of Nucleon Resonances
• Re-examining the $X(4630)$ resonance in the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions
• 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
• Towards the Minimal Spectrum of Excited Baryons
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Nucleon resonances in $\gamma p\to \omega p$ reaction
• Double-polarization observable G in neutral-pion photoproduction off the proton
• Neutral pion photoproduction on the nucleon in a chiral quark model
• N* Experiments and their Impact on Strong QCD Physics
• Baryon transition form factors at the pole
• Correlations of $\mathbf{\pi N}$ Partial Waves for Multi-Reaction Analyses
• The reaction $\pi N\to \omega N$ in a dynamical coupled-channel approach
• Global analysis of charge exchange meson production at high energies
• Nucleon Resonance Physics
• Structure of Pion Photoproduction Amplitudes
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• Pion photoproduction of nucleon excited states with Hamiltonian effective field theory
• Two-body wave functions and compositeness from scattering amplitudes: II. Application to the physical $N^{\ast }$ and ${\Delta }^{\ast }$ resonances
• Global Data-Driven Determination of Baryon Transition Form Factors
• Spectrum and Structure of Excited Baryons with CLAS
• Dispersive analysis of low energy ${\gamma }^{\ast }N\to \pi N$ process
• On the spin-observables in pseudoscalar meson photoproduction
• Compton scattering off proton in the third resonance region
• Dynamical generation of resonances in the P33 partial wave
• The Joint Physics Analysis Center: Recent results
• Complex phase structure of the meson-baryon $T$-matrix
• Baryon spectroscopy with polarization observables from CLAS
• Double polarisation experiments in meson photoproduction
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction
• Coupled-channel contributions to the GDH sum rule from the Jülich-Bonn approach