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 (5)

• QCD corrections to J/psi and Upsilon production at hadron colliders
• Upsilon production at the Tevatron and the LHC
• QCD corrections to J/psi polarization of hadronproduction at Tevatron and LHC
• Double charm production e^+ e^- \to J/ψ+ c \bar{c} at B factories with next-to-leading order QCD corrections
• Analysis of charmonium production at fixed-target experiments in the NRQCD approach

Cited by in corpus (19)

• Heavy quarkonium: progress, puzzles, and opportunities
• MCFM for the Tevatron and the LHC
• J/psi (psi') production at the Tevatron and LHC at O(α_s^4v^4) in nonrelativistic QCD
• Reconciling J/psi production at HERA, RHIC, Tevatron, and LHC with NRQCD factorization at next-to-leading order
• Polarization for Prompt J/psi, psi(2s) production at the Tevatron and LHC
• QCD radiative corrections to ${\chi }_{cJ}$ production at hadron colliders
• Inclusive double-quarkonium production at the Large Hadron Collider
• Pair Production of Heavy Quarkonium and $B_c{(}^{\ast })$ Mesons at Hadron Colliders
• QCD corrections to Upsilon production via color-octet states at the Tevatron and LHC
• J/ψpolarization in photo-production up-to the next-to-leading order of QCD
• QCD corrections to $J/\psi$ production in association with a $W$-boson at the LHC
• Relativistic Correction to Color Octet J/psi Production at Hadron Colliders
• Prompt heavy quarkonium production in association with a massive (anti)bottom quark at the LHC
• Inclusive diffractive heavy quarkonium photoproduction in pp, pA and AA collisions
• Color-singlet J/psi production at alpha_s^6 in Upsilon decay
• p p -> J/psi+Upsilon+X as a clean probe to the quarkonium production mechanism
• 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
• J/psi production in ep collisions at HERA