Colour-octet Contributions to $x_F$ Distributions in $J/\psi$ Hadro-production at Fixed Target Energies

Abstract

We study J/ψproduction at fixed-target energies, including the colour-octet production mechanisms predicted by NRQCD. In an earlier paper, we found that the octet components were crucial in understanding p_T-integrated forward (x_F > 0) cross-sections. Here we make a detailed comparison of the theoretical predictions with measured x_F distributions from fixed-target experiments. We find that the model predictions agree well with data. Taking into account higher orders in NRQCD, we argue that sigma(chi_1)/sigma(chi_2)=0.6, in excellent agreement with data. Similiar arguments also predict that sigma(chi)/sigma(J/psi) is roughly equal in photo- and hadro-production.

LaTeX source; giving 18 pages including 5 figures; minor changes in text

References in corpus (16)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Improved Nonrelativistic QCD for Heavy Quark Physics
• Color-octet quarkonia production
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• Hadro-production of Quarkonia in Fixed Target Experiments
• J/psi Production via Fragmentation at the Tevatron
• A Precise Determination of ${\alpha }_s$ from Lattice QCD
• A New Determination of M_b Using Lattice QCD
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• Colour-octet Contributions to J/psi Hadroproduction at Fixed Target Energies
• Hadronic $\psi$ production calculated in the NRQCD factorization formalism

Cited by in corpus (20)

• NLO Production and Decay of Quarkonium
• Quarkonium Photoproduction at Next-to-leading Order
• NRQCD Factorization and Velocity-dependence of NNLO Poles in Heavy Quarkonium Production
• Leptoproduction of J/psi
• J/ΨProduction in pp Collisions at \sqrt s = 200 GeV at RHIC
• Color Octet Contribution to High p_T J/ΨProduction in pp Collisions at \sqrt s = 500 and 200 GeV at RHIC
• Production of J/psi Mesons in p Be Collisions at 530 and 800 GeV/c
• eta_c production at the Large Hadron Collider
• The Soft Gluon Emission Process in the Color-Octet Model for Heavy Quarkonium Production
• Lh_c
• J/psi+gamma production at the LHC
• J/psi Spin Asymmetries in the Colour-Octet Model
• Resolution of the LHCb ${\eta }_c$ anomaly
• Chi_1 and Polarisation Asymmetries for Quarkonia at High Orders in Non-relativistic QCD
• Color-Octet Fraction in J/Psi Production and Absorption
• Is there Anomalous J/psi Suppression in Present-day Heavy-ion Collisions?
• Quarkonium Polarization in Non-relativistic QCD and the Quark-Gluon Plasma
• Higher Orders in the Colour-Octet Model of J/ψProduction
• Predictions for $h_c$ and $h_b$ production at the LHC
• Single Polarisation Asymmetries for Quarkonia in Non-relativistic QCD