| DATE: |
2009-06-12 16:00 - 17:00 |
| PLACE: |
Kenkyu Honkan 3F Rm. 322 |
| TITLE: |
Where is the K-p bound state? Sigma pi Invariant-Mass Spectra from Resonant Formation of Lambda(1405) with stopped kaon on D &4He |
| CONTACT: |
YASUI Shigehiro / yasuis AT post.kek.jp |
| SPEAKER: |
Mr. J. Esmaili (RIKEN) |
| LANGUAGE: |
English |
| ABSTRACT: |
The Sigma pi invariant-mass spectra in the resonant-capture of K- at
rest in 4He, 3He and d are calculated by a coupled-channel procedure for a
K−p quasi-bound state of arbitrary chosen mass and width. A Chi^2
analysis of old 4He bubble chamber data shows dominance of the s-orbit
absorption and yielded M = 1405.5+1.4−1 MeV/c2 and Gamma =
26+4−3 MeV, where possible population of Sigma^0(1385) and also a
small p-orbit capture contribution are taken into account. This result
confirms the Lambda(1405) Ansatz. A more stringent test is proposed by
using a D target. |
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