Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of Inelastic J/Psi Photoproduction at HERA   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 $0.4<z<0.9$ ($0.5<z<0.9$) for the muon (electron) decay mode,
where $z$ is the fraction of the photon energy carried by the J/$\psi$ in the
proton rest frame. The cross section, the $p^2_T$ and the $z$ distributions,
after having subtracted the contributions from resolved photon and diffractive
proton dissociative processes, are given for the photon-proton centre of mass
energy range $50<W<180$ GeV; $p^2_T$ is the square of the J/$\psi$ transverse
momentum with respect to the incoming proton beam direction. In the kinematic
range $0.4 < z < 0.9$ and $p^2_T > 1$ 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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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: stat
0
The categories of this paper are: hep-ph