A chiral quark model for meson electro-production in the region of D-wave resonances

Abstract

The meson scattering and electroproduction amplitudes in the D13, D33 and D15 partial waves are calculated in a coupled-channel formalism incorporating quasi-bound quark-model states, extending our previous studies of the P11, P33 and S11 partial waves. The vertices of the baryon-meson interaction including the s- and d-wave pions and $\rho$-mesons, the s-wave $\eta$-meson, and the $s$- and p-wave $\sigma$-mesons are determined in the Cloudy Bag Model, with some changes of the parameters to reproduce the widths of the resonances. The helicity amplitudes and the electroproduction amplitudes exhibit consistent behavior in all channels but tend to be too weak compared to the experiment. We discuss possible origins of this discrepancy which arises also in the constituent quark model calculations.

11 pages, 11 figures, accepted for publication in EPJA

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Cited by in corpus (13)

• New Results from the Studies of the $N(1440)1/2^{+}$, $N(1520)3/2^{-}$, and $\Delta (1620)1/2^{-}$ Resonances in Exclusive $ep\to e^{\prime }{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction with the CLAS Detector
• Photocouplings at the Pole from Pion Photoproduction
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Electromagnetic Transition Form Factors of Baryon Resonances
• Valence quark and meson cloud contributions to the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors
• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Improved empirical parametrizations of the ${\gamma }^{\ast }N\to \Delta (1232)$ and ${\gamma }^{\ast }N\to N(1520)$ helicity amplitudes and the Siegert's theorem
• The Roper resonance: a genuine quark state or a dynamically generated structure?
• Eta and kaon production in a chiral quark model
• Dynamical generation of resonances in the P33 partial wave
• The $\Lambda (1405)$ resonance as a genuine three-quark or molecular state
• About the magnitude of the ${\gamma }^{\ast }N\to N(1520)$ transverse amplitudes near $Q^2=0$