Higher Order Two Step Mechanisms in Nucleon Antinucleon Annihilation and the OZI Rule

TL;DR

This paper investigates nucleon-antinucleon annihilation mechanisms, providing detailed calculations for specific channels and explaining OZI rule violations through meson doorway states and tree diagrams.

Contribution

It introduces a comprehensive evaluation of three meson doorway mechanisms for the first time, enhancing understanding of OZI rule violations in nucleon-antinucleon annihilation.

Findings

Consistent explanation of large and small OZI violations.

Detailed results for phi pi0 and phi rho channels.

Improved contributions from doorway states and tree diagrams.

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 pi0 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.