Measurement of the Reaction $γ^* p \to φp$ in Deep Inelastic $e^+p$ Scattering at HERA

Details Measurement of the Reaction $γ^* p \to φp$ in Deep Inelastic $e^+p$ Scattering at HERA Measurement of the Reaction $γ^* p \to φp$ in Deep Inelastic $e^+p$ Scattering at HERA

1996-04-25

arxiv.org/abs/hep-ex/9604008v2

Phys.Lett.B380:220-234,1996

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages, including 4 figures. Includes some minor editorial changes

Scientific paper

10.1016/0370-2693(96)00603-X

The production of $\phi$ mesons in the reaction $e^{+}p \rightarrow e^{+} \phi p$ ($\phi \rightarrow K^{+}K^{-}$), for $7 < Q^2 < 25$ GeV$^2$ and for virtual photon-proton centre of mass energies ($W$) in the range 42-134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar $Q^2$, the results show that the $\gamma^*p \rightarrow \phid p$ cross section rises strongly with $W$. This behaviour is similar to that previously found for the $\gamma^*p \rightarrow \rho^0 p$ cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small $x$. The ratio of $\sigma (\phi) / \sigma (\rho^0)$, which has previously been determined by ZEUS to be 0.065 $\pm$ 0.013 (stat.) in photoproduction at a mean $W$ of 70 GeV, is measured to be 0.18 $\pm $ 0.05 (stat.) $\pm$ 0.03 (syst.) at a mean $Q^2$ of 12.3 GeV$^2$ and mean $W$ of $\approx$ 100 GeV and is thus approaching at large $Q^2$ the value of 2/9 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.

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