$pp\to pp\omega$ reaction near threshold

Abstract

We analyze the total cross section data for $pp\to pp\omega$ near threshold measured recently at SATURNE. Using an effective range approximation for the on-shell $pp$ S-wave final state interaction we extract from these data the modulus $|\Omega |=0.53$ fm${}^4$ of the threshold transition amplitude $\Omega$. We present a calculation of various (tree-level) meson exchange diagrams contributing to $\Omega$. It is essential that $\omega$-emission from the anomalous $\omega \rho \pi$-vertex interferes destructively with $\omega$-emission from the proton lines. The contribution of scalar $\sigma$-meson exchange to $\Omega$ turns out to be negligibly small. Without introducing off-shell meson-nucleon form factors the experimental value $|\Omega |=0.53$ fm${}^4$ can be reproduced with an $\omega N$-coupling constant of $g_{\omega N}=10.7$. The results of the present approach agree qualitatively with the Jülich model. We also perform a combined analysis of the reactions $pp\to pp{\pi }^0,pn{\pi }^{+},pp\eta ,pp\omega$ and $pn\to pn\eta$ near threshold.

Latex-file 6 pages, 2 Figures

References in corpus (4)

• Novel approach to pion and eta production in proton-proton collisions near threshold
• Near-Threshold Production of omega Mesons in the pp -> pp omega Reaction
• Production of $\omega$-mesons in proton-proton collisions
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