2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 9, 115-118

On the search for a narrow penta-quark Z+-baryon in NN interactions

M.V. Polyakov1,2 - A. Sibirtsev3 - K. Tsushima4 - W. Cassing3 - K. Goeke1

1 Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany
2 Petersburg Nuclear Physics Institute, Gatchina, 188350 Russia
3 Institut für Theoretische Physik, Universität Giessen, D-35392 Giessen, Germany
4 Special Research Center for the Subatomic Structure of Matter (CSSM) and Department of Physics and Mathematical Physics, University of Adelaide, SA 5005, Australia

Received: 24 May 2000
Communicated by W. Weise

Abstract
The possibility for an observation of a narrow penta-quark Z+-baryon in NN reactions is discussed. It is shown that the $pp{\to}n\Sigma^+K^+$ 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.

PACS
12.39.Mk Glueball and nonstandard multiquark/gluon states - 13.75.Cs Nucleon-nucleon interactions - 13.75.Jz Kaon-baryon interactions - 14.20.-c Baryons


Copyright Società Italiana di Fisica, Springer-Verlag 2000