The possibility for an observation of a narrow penta-quark Z+ baryon in NN reactions is discussed. It is shown that the pp→nΣ+K+ reaction at excess energies around 100 MeV above threshold provides optimal conditions for Z+ baryon detection by an analysis of the nK+ invariant mass spectrum, if the Z+ mass is located around 1.5 GeV involving a rather narrow width.
@article{arxiv.nucl-th/9909048,
title = {On the search for a narrow penta-quark Z$^+$ baryon in NN interactions},
author = {M. V. Polyakov and A. Sibirtsev and K. Tsushima and W. Cassing and K. Goeke},
journal= {arXiv preprint arXiv:nucl-th/9909048},
year = {2009}
}