2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 7, 261-269

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 $\phi\pi^0$ originating from the 3S1 initial state and for the $\phi\rho$ 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