Impact of pi N --> pi pi N data on determining high-mass nucleon resonances

Abstract

Motivated by an experimental proposal for the measurement of the pi N --> pi pi N reactions at J-PARC, we examine a potential impact of the pi N --> pi pi N cross section data on the determination of the resonance parameters of the high-mass N* states. For this purpose, we make use of the ANL-Osaka dynamical coupled-channels model, which has been developed recently by a combined analysis of the unpolarized as well as polarized observables of pion- and photon-induced pi N, eta N, K Lambda, and K Sigma production reactions off a proton target. We present predictions for the pi N --> pi pi N total cross sections and invariant mass distributions, and demonstrate that the pi N --> pi pi N differential cross section data can indeed be a crucial source of information for understanding N* --> pi Delta, rho N, sigma N --> pi pi N decay of the high-mass N* states.

11 pages, 7 figures. Version to appear in PRC

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• Extended Partial-Wave Analysis of piN Scattering Data
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• Dynamical Coupled-Channel Model of $\pi N$ Scattering in the W $\le$ 2 GeV Nucleon Resonance Region
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• Toward establishing low-lying $\Lambda$ and $\Sigma$ hyperon resonances with the $\bar{K}+d\to \pi +Y+N$ reaction
• Low-energy $\eta$-nucleon interaction studied with $\eta$ photoproduction off the deuteron
• The nucleon resonances in the $J/\psi \to p\bar{p}{\eta }^{\prime }$ decay
• Reexamination of the role of the ${\Delta }^{\ast }$ resonances in the $pp\to n{K}^{+}{\Sigma }^{+}$ reaction
• Disentangle the nature of resonances in coupled-channel models
• Light-quark baryon spectroscopy within ANL-Osaka dynamical coupled-channels approach
• Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum
• Neutrino-induced meson productions