Extracting the resonance information with a dynamical coupled-channels model

Hiroyuki Kamano
JLab

A continuous effort to explore the nature of N* states has been
made in Excited Baryon Analysis Center by analyzing the world data
of meson production reactions off the nucleon target.
The analysis is pursued with a unitarized dynamical coupled-channels model,
which takes account of couplings among relevant reaction channels
in the energy region under the consideration.

Once a reaction model is constructed by analyzing the reaction data,
various information on the nucleon resonances, such as poles and decay vertices,
can be extracted from the model.

In this talk, I will explain how we make such an extraction practically and
discuss a role played by the analytic structure of the scattering amplitudes
on the complex energy plane in understanding the resonance properties.