DOI 10.1007/s100520000376
Color octet contribution in exclusive P-wave charmonium decay into octet and decuplet baryons
S.M.H. Wong 1,2,3,4
1 School of Physics and Astronomy, University of
Minnesota, Minneapolis,
MN 55455, USA
2 Fachbereich Physik, Universität Wuppertal, 42097 Wuppertal,
Germany
3 Institute of Accelerating Systems and Applications (IASA),
P.O. Box 17214, 10024 Athens, Greece
4 Nuclear and Particle Physics Section, University of Athens,
Panepistimiopolis,
15771 Athens, Greece
Received: 1 March 1999 / Published online: 18 May 2000 - © Springer-Verlag 2000
Abstract
In the last years, the need for the color octet state in inclusive
P-wave
charmonium decay has been firmly established. However, the implications
of this in the corresponding exclusive reactions have not been
fully
recognized. We argue for the necessity of the color octet in
P- and
higher-wave quarkonium decay. Using a set of phenomenologically
constructed baryon wave functions, we consider the
decay
into an
octet and decuplet baryon-antibaryon pair. By doing so, we subject
the
wave functions to a test of applicability. We show that the color
singlet
component alone is insufficient to account for the experimental
measurements,
and only by including the color octet contribution can the partial
theoretical decay widths be brought into the range of the data.
By the present and earlier applications of the set of wave functions,
these
show themselves to be reasonable model wave functions at around
the
scale
-20 GeV2.
Copyright Società Italiana di Fisica, Springer-Verlag 2000
