Keeping the full gluon transverse momentum in diffractive quarkonium production matches HERA psi(2S)/J/psi ratios better than the standard dipole limit and yields new EIC Upsilon-ratio predictions.
Chekanov et al., Exclusive photoproduction of J/ψ mesons at HERA, Eur
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abstract
The exclusive photoproduction of J/psi mesons, gamma p->J/psi p, has been studied in ep collisions with the ZEUS detector at HERA, in the kinematic range 20<W<290 GeV, where W is the photon-proton centre-of-mass energy. The J/psi mesons were reconstructed in the muon and the electron decay channels using integrated luminosities of 38 pb^-1 and 55 pb^-1, respectively. The helicity structure of J/psi production shows that the hypothesis of s-channel helicity conservation is satisfied at the two standard-deviation level. The total cross section and the differential cross-section dsigma/dt, where t is the squared four-momentum transfer at the proton vertex, are presented as a function of W, for |t|<1.8 GeV^2. The t distribution exhibits an exponential shape with a slope parameter increasing logarithmically with W with a value b=4.15 \pm 0.05 (stat.)^{+0.30}_{-0.18} (syst.) GeV^-2 at W=90 GeV. The effective parameters of the Pomeron trajectory are alphapom(0) = 1.200 \pm 0.009(stat.)^{+0.004}_{-0.010}(syst.) and alphappom= 0.115 \pm 0.018(stat.)^{+0.008}_{-0.015}(syst.) GeV^-2.
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Near-threshold J/psi photoproduction data are compatible with the OPE energy dependence, but cannot distinguish target-mass-corrected from uncorrected predictions or locate the transition to high-energy diffraction.
The paper provides a detailed physics and user manual for the PYTHIA 8.3 Monte Carlo event generator used in high-energy physics.
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Diffractive Production of Heavy Quarkonia at the Electron Ion Collider
Keeping the full gluon transverse momentum in diffractive quarkonium production matches HERA psi(2S)/J/psi ratios better than the standard dipole limit and yields new EIC Upsilon-ratio predictions.
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Near-Threshold OPE Constraints and High-Energy Diffractive Dynamics in J/psi Photoproduction
Near-threshold J/psi photoproduction data are compatible with the OPE energy dependence, but cannot distinguish target-mass-corrected from uncorrected predictions or locate the transition to high-energy diffraction.
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A comprehensive guide to the physics and usage of PYTHIA 8.3
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