Polarized J/psi production in deep inelastic scattering at HERA

Abstract

We perform a calculation on the polarization of J/psi production in deep inelastic scattering in the HERA energy range. For the inclusive production distributions, we find that the color-singlet contributions are consistent with the experimental data in the major region of z (z>0.4). Only in low z regions, there are some hints of the need of the color-octet contributions to describe the experimental data. For the polarization of J/psi in DIS processes, we find the parameter alpha changes with Q^2. Especially, at higher Q^2, difference on alpha between color-singlet and color-octet contributions become more distinctive. In the two regions of lower and larger z, the polarization parameter alpha have different features. These properties can provide important information on the polarization mechanism for J/psi production.

Some typos in some equations are corrected. These typos do not affect the calculation and numerical results presented in the original paper

References in corpus (22)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Color-octet quarkonia production
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Color-octet quarkonia production II
• Measurement of J/Psi and Psi(2S) Polarization in ppbar Collisions at sqrt(s) = 1.8 TeV
• Polarization of Prompt J/psi at the Tevatron
• QCD Corrections to Inelastic $J/\psi$ Photoproduction
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Spin symmetry predictions for heavy quarkonia alignment
• Quantitative Tests of Color Evaporation: Charmonium Production
• Charmonium Production at the Tevatron
• Color-octet mechanism in $\gamma +p\to J/\psi +X$
• Inelastic photoproduction of polarised $J/\psi$
• Kinematic Enhancement of Non-Perturbative Corrections to Quarkonium Production
• Quarkonium momentum distributions in photoproduction and B decay
• Charmonia production in hadron colliders and the extraction of colour-octet matrix elements
• J/psi Inclusive Production in ep Deep-Inelastic Scattering at DESY HERA
• Leptoproduction of J/psi
• Photoproduction of J/$\psi$ in the forward region
• J/psi production at the Tevatron and HERA: the effect of k_T smearing
• Quarkonium Production through Hard Comover Scattering
• Quarkonium Production through Hard Comover Scattering. II

Cited by in corpus (11)

• Quarkonium Production at High-Energy Colliders
• New Observables in Inclusive Production of Quarkonia
• J/psi plus jet associated production in two-photon collisions at next-to-leading order
• J/psi Inclusive Production in ep Deep-Inelastic Scattering at DESY HERA
• QCD Corrections to the Color-singlet $J/\psi$ Production in Deeply Inelastic Scattering at HERA
• QCD leading order study of the $J/\psi$ leptoproduction at HERA within the nonrelativistic QCD framework
• Upsilonium polarization as a touchstone in understanding the proton dynamics in QCD
• Prompt J/psi production in charged-current deep-inelastic scattering
• $J/\psi$ polarization in large-$P_T$ semi-inclusive deep-inelastic scattering at the EIC
• ${\rm Y}$ electroproduction at HERA, EIC, and LHeC within the nonrelativistic QCD framework
• J/psi production in ep collisions at HERA