Higher order two step mechanisms in nucleon antinucleon annihilation and the OZI rule
S. von Rotz1,2 - M.P. Locher1,2 - V.E. Markushin1
1 Paul Scherrer Institute, 5232 Villigen, Switzerland
2 University of Zurich, 8047 Zürich, Switzerland
Received: 22 December 1999 Communicated by F. Lenz
Abstract
We evaluate three meson doorway mechanisms for nucleon-antinucleon
annihilation at rest for the first time.
Detailed results are presented for the final state 
originating from the 3S1 initial state and for the
channel originating from 1S0.
The results presented also include the improved contributions
from two meson doorway states and from the tree diagrams.
For all the channels considered a consistent explanation of large and
small OZI violations emerges.
PACS
13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) -
12.40.Vv Vector-meson dominance
Copyright Società Italiana di Fisica, Springer-Verlag 2000
