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
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
