| 2 | Resonance properties from a coupled channel meson exchange model显示文摘In this talk, I present the results on the pole structure of pion-nucleon scattering in an analytic model based on meson exchange. The analytic properties of scattering amplitudes provide important information. Besides the cuts, the poles and zeros on the different Riemann sheets determine the global behavior of the amplitude on the physical axis. Pole positions and residues allow for a parameterization of resonances in a well-defined way, free of assumptions for the background and energy dependence of the resonance part. This is a necessary condition to relate resonance contributions in different reactions. | M. Dring C. Hanhart 黄飞 S. Krewald U.-G. Meiβner | 2009 | Chinese Physics C2009，33，12： | 0 |
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