摘要
We have developed an analytic continuation method for extracting parameters of nucleon resonances within a Hamiltonian formulation of meson-nucleon reactions. The method was tested for simple solvable models and then applied for our recent coupled channels model （πN, ηN, π△, ρN, and σN ） of the π＊N and γ＊N reactions. The resonance pole positions and their properties are studied for P11and P11 channels.
We have developed an analytic continuation method for extracting parameters of nucleon resonances within a Hamiltonian formulation of meson-nucleon reactions. The method was tested for simple solvable models and then applied for our recent coupled channels model （πN, ηN, π△, ρN, and σN ） of the π＊N and γ＊N reactions. The resonance pole positions and their properties are studied for P11and P11 channels.
基金
Supported by Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research(C) 20540270
U.S. Department of Energy, Office of Nuclear Physics Division, under contract No. DE-AC02-06CH11357
Contract No. DE-AC05-060R23177 under which Jefferson Science Associates operates Jefferson Lab
