Measurement of Elastic omega Photoproduction at HERA

Abstract

The reaction $\gamma p\to \omega p$ $(\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and ${\pi }^0\to \gamma \gamma )$ has been studied in $ep$ interactions using the ZEUS detector at photon-proton centre-of-mass energies between $70$ and $90GeV$ and $|t|<0.6Ge{V}^2$, where $t$ is the squared four momentum transferred at the proton vertex.The elastic \ome photoproduction cross section has been measured to be ${\sigma }_{\gamma p\to \omega p}=1.21\pm 0.12\pm 0.23\mu b$. The differential cross section $d{\sigma }_{\gamma p\to \omega p}/d|t|$ has an exponential shape $e^{-b|t|}$ with a slope $b=10.0\pm 1.2\pm 1.3Ge{V}^{-2}$. The angular distributions of the decay pions are consistent with s-channel helicity conservation. When compared to low energy data, the features of $\omega$ photoproduction as measured at HERA energies are in agreement with those of a soft diffractive process. Previous measurements of the ${\rho }^0$ and $\varphi$ photoproduction cross sections at HERA show a similar behaviour.

arXiv comment32 pages including 7 figures Various changes throughout the text of paper

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