33 research outputs found
True parameters of He-4-Sigma hypernucleus
It is shown that the true parameters of He-4-Sigma differ from the observed
ones. The reason is that the amplitude of He-4-Sigma production in the reaction
He-4(K-,pi-) sharply varies just in the corresponding mass region. It leads to
the small, but noticeable shift of the binding energy and the width. Besides,
the data at the threshold of Sigma-0 production is found to give an additional
evidence that He-4-Sigma width cannot exceed 8.0 - 8.5 MeV.Comment: 11 pages, 4 Postscript figure