Measurement of inelastic $J/\psi$ and $\psi^\prime$ photoproduction at HERA

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(−1) 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 ( )T( ). 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 ( )T( ) 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 ( )T( ) > 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 ( )T( )-factorisation approach.

Note:

27 pages, 10 figures

psi(3685): photoproduction
J/psi(3100): photoproduction
transverse momentum: dependence
channel cross section: ratio
quantum chromodynamics: nonrelativistic
energy dependence
electron p: inelastic scattering
DESY HERA Stor
ZEUS
dimuon: final state

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