　　　　Date : 2008/3/21 (Fri.) 16:00 -
　　　　Place : RCNP 4F Lecture Room
　　　　Speaker : Dr. Tetsuo Hyodo( Munich, Tech. U./YITP )

　　　　Title : Lambda(1405) in chiral dynamics

　　　　Abstract :
　　　　We discuss several aspects of the Lambda(1405) resonance in relation to
　　　　the recent developments of study of chiral dynamics.　We derive an effective
　　　　single-channel Kbar N interaction based on chiral SU(3) coupled-channel appraoch,
　　　　emphasizing the important role of the pi Sigma channel and the structure of the
　　　　Lambda(1405) in Kbar N phenomenology. We study the behavior with the number of
　　　　colors (N_c) of the pole positions of the Lambda (1405), in order to clarify the quark
　　　　structure of the resonance by the Nc scaling. From the viewpoint of the scattering
　　　　theory, we analyze the origin of the resonances in chiral dynamics, paying attention
　　　　to the physical meaning of the renormalization procedure.