Pion-Lambda-Sigma Coupling Extracted from Hyperonic Atoms
Abstract
The latest measurements of the atomic level width in Sigma-hyperonic Pb atom offer the most accurate datum in the region of low-energy Sigma-hyperon physics. Atomic widths are due to the conversion of Sigma-nucleon into Lambda-nucleon. In high angular momentum states this conversion is dominated by the one-pion exchange. A joint analysis of the data of the scattering of negative-Sigma on proton converting into a Lambda and a neutron and of the atomic widths allows to extract a pseudovector pion-hyperon-Sigma coupling constant of 0.048 with a statistical error of +-0.005 and a systematic one of +-0.004. This corresponds to a pseudoscalar coupling constant of 13.3 with a statistical uncertainty of 1.4 and a systematic one of 1.1.
Cite
@article{arxiv.nucl-th/0012005,
title = {Pion-Lambda-Sigma Coupling Extracted from Hyperonic Atoms},
author = {B. Loiseau and S. Wycech},
journal= {arXiv preprint arXiv:nucl-th/0012005},
year = {2009}
}
Comments
12 pages, 1 figure, Use of Revtex.sty