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Elastic and Proton-Dissociative Photoproduction of J/psi Mesons at HERA

Abstract : Cross sections for elastic and proton-dissociative photoproduction of J/psi mesons are measured with the H1 detector in positron-proton collisions at HERA. The data were collected at $ep$ centre-of-mass energies sqrt{s} approx 318 GeV and sqrt{s} approx 225 GeV, corresponding to integrated luminosities of L = 130 pb^{-1} and L = 10.8 pb^{-1}, respectively. The cross sections are measured as a function of the photon-proton centre-of-mass energy in the range 25< Wgp < 110 GeV. Differential cross sections $\mathrm{d}\sigma / \mathrm{d}t$, where $t$ is the squared four-momentum transfer at the proton vertex, are measured in the range $|t| < 1.2 \, \gevsq$ for the elastic process and $|t| < 8 \, \gevsq$ for proton dissociation. The results are compared to other measurements. The $\Wgp$ and $t$-dependences are parametrised using phenomenological fits.
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Submitted on : Monday, April 22, 2013 - 10:26:32 AM
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C. Alexa, J.C. Bizot, V. Brisson, B. Delcourt, M. Jacquet, et al.. Elastic and Proton-Dissociative Photoproduction of J/psi Mesons at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2013, 73, pp.2466. ⟨10.1140/epjc/s10052-013-2466-y⟩. ⟨in2p3-00816384⟩



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