| DATE: |
2009-06-12 15:00 - 16:00 |
| PLACE: |
Kenkyu Honkan 3F Rm. 322 |
| TITLE: |
Single-pole nature of $Lambda (1405)$ and structure of $K^-pp$ |
| CONTACT: |
YASUI Shigehiro / yasuis AT post.kek.jp |
| SPEAKER: |
Visiting Prof. Yoshinori Akaishi (Nihon University, RIKEN) |
| LANGUAGE: |
English |
| ABSTRACT: |
In recent years few-body deeply bound kaonic states have been predicted
and investigated on the basis of the $ar{K} N$ interaction which was
derived so as to account for $Lambda (1405)$ and $ar KN$ scattering
lengths. Theoretical background of the phenomenological $ar KN$
interaction is discussed in comparison with the effective $ar KN$
interaction based on chiral SU(3) dynamics. It is also shown that
the evidence for two-pole structure of $Lambda (1405)$ is logically
rejected, since one of the poles cannot produce any peak-structure in
the experimental spectrum. |
