Measurement of inelastic J/ψ and ψ′ photoproduction at HERA
(2013) Journal of High Energy Physics (Print) — Vol. 2013, n° 2, p. 1-30 (2013)
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- Abstract
- The cross sections for inelastic photoproduction of J/ψ and ψ′ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb<sup>-1</sup> collected in the period 1996-2007. The ψ′ to J/ψ cross section ratio was measured in the range 0.55 < z < 0.9 and 60 < W < 190 GeV as a function of W, z and p<inf>T</inf>. Here W denotes the photon-proton centre-of-mass energy, z is the fraction of the incident photon energy carried by the meson and p <inf>T</inf> is the transverse momentum of the meson with respect to the beam axis. The J/ψ cross sections were measured for 0.1 < z < 0.9, 60 < W < 240 GeV and p<inf>T</inf> > 1 GeV. Theoretical predictions within the non-relativistic QCD framework including NLO colour-singlet and colour-octet contributions were compared to the data, as were predictions based on the k <inf>T</inf>-factorisation approach. © 2013 SISSA.
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Abramowicz, H., Piotrzkowski, K., & et al. (2013). Measurement of inelastic J/ψ and ψ′ photoproduction at HERA. Journal of High Energy Physics (Print), 2013(2), 1-30. https://doi.org/10.1007/JHEP02(2013)071 (Original work published 2013)