| 日時: |
2008-08-01 16:00 - 17:00 |
| 場所: |
研究本館３階３２１室 |
| 会議名: |
Electromagnetic Form Factors of Lambda(1405) in Chiral Dynamics(in Japanese) |
| 連絡先: |
津田 |
| 講演者: |
関原 隆泰 (京都大学大学院理学研究科物理学第二教室 原子核理論研究室) |
| 講演言語: |
日本語 |
| アブストラクト: |
The structure of the Lambda(1405) has been a long-standing issue. The Lambda(1405) has been considered as a quasi-bound state of anti-kaon and nucleon (KbarN) system before QCD was established. Recent theoretical investigations have also suggested that the Lambda(1405) is well described as a dynamically generated resonant state of meson-baryon scattering with I = 0 and S = −1 based on chiral dynamics in coupled-channel approach, which is so-called chiral unitary model (ChUM). This model has successfully reproduced cross sections of K−p to various channels and also the mass spectrum of the Lambda(1405) resonance below the KbarN threshold, giving two states for the Lambda(1405) found as poles of the scattering amplitude in the complex energy plane.
One expects that the Lambda(1405) as meson-baryon quasi-bound molecule with small binding energy has a larger size than typical ground state baryons dominated by a genuine quark state. If this is the case, the form factor of the Lambda(1405) falls off more rapidly than that of the nucleon and the production cross section of the Lambda(1405) has large energy dependence. In this talk, we estimate the electromagnetic form factors of the Lambda(1405) based on the ChUM. Such electromagnetic properties of the Lambda(1405) could be obtained in photon-induced production experiments. |
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