Measurement of Inelastic J/Psi Photoproduction at HERA

Abstract

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 $p_T^2$ 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; $p_T^2$ 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 $p_T^2>1$ 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.

arXiv comment31 pages including 7 figures

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