New data on OZI rule violation in bar{p}p annihilation at rest

TL;DR

This paper reports measurements of the ratio of phi to omega production in antiproton annihilation at rest, revealing a dependence on dipion mass and momentum transfer, indicating OZI rule violation.

Contribution

It provides new experimental data on OZI rule violation in antiproton annihilation, highlighting the dependence on dipion mass and initial state momentum transfer.

Findings

The ratio R increases as dipion mass decreases.

Evidence suggests momentum transfer influences OZI violation.

Differences in phi and omega production mechanisms are demonstrated.

Abstract

The results of a measurement of the ratio R = Y(phi pi+ pi-) / Y(omega pi+ pi-) for antiproton annihilation at rest in a gaseous and in a liquid hydrogen target are presented. It was found that the value of this ratio increases with the decreasing of the dipion mass, which demonstrates the difference in the phi and omega production mechanisms. An indication on the momentum transfer dependence of the apparent OZI rule violation for phi production from the 3S1 initial state was found.