Antikaon-nucleon interaction and Lambda(1405) in chiral SU(3) dynamics
Abstract
The properties of the Lambda(1405) resonance are key ingredients for determining the antikaon-nucleon interaction in strangeness nuclear physics, and the novel internal structure of the Lambda(1405) is of great interest in hadron physics, as a prototype case of a baryon that does not fit into the simple three-quark picture. We show that a quantitative description of the antikaon-nucleon interaction with the Lambda(1405) is achieved in the framework of chiral SU(3) dynamics, with the help of recent experimental progress. Further constraints on the Kbar N subthreshold interaction are provided by analyzing pi Sigma spectra in various processes, such as the K-d -> pi Sigma n reaction and the Lambda_c -> pi pi Sigma decay. The structure of the Lambda(1405) is found to be dominated by an antikaon-nucleon molecular configuration, based on its wavefunction derived from a realistic Kbar N potential and the compositeness criteria from a model-independent weak-binding relation.
Cite
@article{arxiv.1602.08852,
title = {Antikaon-nucleon interaction and Lambda(1405) in chiral SU(3) dynamics},
author = {Yuki Kamiya and Kenta Miyahara and Shota Ohnishi and Yoichi Ikeda and Tetsuo Hyodo and Eulogio Oset and Wolfram Weise},
journal= {arXiv preprint arXiv:1602.08852},
year = {2016}
}
Comments
27 pages, 9 figures. Prepared for Nuclear Physics A Special Issue on recent progress in Strangeness and Charm Nuclear Physics