J/psi production at HERA

Abstract

We consider the J/psi photo-production data collected at HERA in the light of next-to-leading order predictions for the color-singlet yield and polarization. We find that, while the shapes of inclusive distributions in the transverse momentum and inelasticity are well reproduced, the experimental rates are larger than those given by the color-singlet contribution alone. Furthermore, the next-to-leading order calculation predicts the J/psi's to be mostly longitudinally polarized at high transverse momentum in contrast with the trend of the preliminary data from the ZEUS collaboration.

4 pages, 2 figures, added references

References in corpus (18)

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• QCD corrections to J/psi and Upsilon production at hadron colliders
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• Charmonium Production at the Tevatron
• Inelastic photoproduction of polarised $J/\psi$
• Double charm production e^+ e^- \to J/ψ+ c \bar{c} at B factories with next-to-leading order QCD corrections
• Inelastic Photoproduction of J/Psi Mesons at HERA
• Quarkonium Photoproduction at Next-to-leading Order
• Diffractive Photoproduction of J/psi Mesons with Large Momentum Transfer at HERA
• Measurements of inelastic J/psi and psi' photoproduction at HERA
• Analysis of charmonium production at fixed-target experiments in the NRQCD approach
• QCD Corrections to Radiative Upsilon Decays

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• J/ψpolarization in photo-production up-to the next-to-leading order of QCD
• Sivers effect in Inelastic $J/\psi$ Photoproduction in $e{p}^{\uparrow }$ Collision in Color Octet Model
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• p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production mechanism
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• Kinematic distributions of the ${\eta }_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework
• Photoproduction of $J/\psi$ with forward hadron tagging in hadronic collisions
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• J/psi production in ep collisions at HERA
• The QED contribution to $J/\psi$ plus light hadrons production at B-factories
• Automated event generation for S-wave quarkonium and leptonium production in NRQCD and NRQED