Measurement of Inelastic J/Psi Photoproduction at HERA

Details Measurement of Inelastic J/Psi Photoproduction at HERA Measurement of Inelastic J/Psi Photoproduction at HERA

1997-08-06

arxiv.org/abs/hep-ex/9708010v1

Z.Phys.C76:599-612,1997

Physics

High Energy Physics

High Energy Physics - Experiment

31 pages including 7 figures

Scientific paper

10.1007/s002880050583

We present a measurement of the inelastic, non diffractive J/$\psi$ photoproduction cross section in the reaction $e^{+} p \to e^{+} {J}/\psi X$ with the ZEUS detector at HERA. The J/$\psi$ was identified using both the $\mu^{+}\mu^{-}$ and $e^{+}e^{-}$ decay channels and events were selected within the range $0.4 1$ GeV$^2$, NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data. The predictions of a specific leading order colour-octet model, as formulated to describe the CDF data on J/$\psi$ hadroproduction, are not consistent with the data.

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