Dynamical coupled-channels analysis of 1H(e,e'pi)N reactions

Abstract

We have performed a dynamical coupled-channels analysis of available p(e,e'pi)N data in the region of W < 1.6 GeV and Q^2 < 1.45 (GeV/c)^2. The channels included are gamma^* N, pi N, eta N, and pi pi N which has pi Delta, rho N, and sigma N components. With the hadronic parameters of the model determined in our previous investigations of pi N --> pi N, pi pi N reactions, we have found that the available data in the considered W < 1.6 GeV region can be fitted well by only adjusting the bare gamma^* N --> N^* helicity amplitudes for the lowest N^* states in P33, P11, S11 and D13 partial waves. The sensitivity of the resulting parameters to the amount of data included in the analysis is investigated. The importance of coupled-channels effect on the p(e,e' pi)N cross sections is demonstrated. The meson cloud effects, as required by the unitarity conditions, on the gamma^* N --> N^* form factors are also examined. Necessary future developments, both experimentally and theoretically, are discussed.

14 pages, 11 figures. Version to appear in PRC

References in corpus (7)

• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Dynamical Coupled-Channel Model of $\pi N$ Scattering in the W $\le$ 2 GeV Nucleon Resonance Region
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• Extraction of Resonances from Meson-Nucleon Reactions
• Dynamical coupled-channels study of pi N --> pi pi N reactions
• Coupled-channels study of the ${\pi }^{-}p\to \eta n$ process

Cited by in corpus (1)

• Model Analysis of the $ep\to e{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction Reaction on the Proton