Hadroproduction and Polarization of Charmonium

Abstract

In the limit of heavy quark mass, the production cross section and polarization of quarkonia can be calculated in perturbative QCD. We study the $p_{\perp }$-averaged production of charmonium states in $\pi N$ collisions at fixed target energies. The data on the relative production rates of $\jp$ and ${\chi }_J$ is found to disagree with leading twist QCD. The polarization of the $\jp$ indicates that the discrepancy is not due to poorly known parton distributions nor to the size of higher order effects ($K$-factors). Rather, the disagreement suggests important higher twist corrections, as has been surmised earlier from the nuclear target $A$-dependence of the production cross section.

19 pages

References in corpus (8)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Gluon Fragmentation into Heavy Quarkonium
• Rigorous QCD Predictions for Decays of P-Wave Quarkonia
• Fragmentation production of J/psi and psi' at the Tevatron
• Fragmentation contribution to quarkonium production in hadron collision
• Angular Distributions in the Drell-Yan Process: A Closer Look at Higher Twist Effects
• Higher Twist Effects in the Drell-Yan Angular Distribution
• Aspects of $\chi$ and $\psi$ Production in Polarized Proton-Proton Collisions

Cited by in corpus (29)

• QCD Corrections to Inelastic $J/\psi$ Photoproduction
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Hadro-production of Quarkonia in Fixed Target Experiments
• Coherence Phenomena in Charmonium Production off Nuclei at the Energies of RHIC and LHC
• Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Inelastic photoproduction of polarised $J/\psi$
• Photoproduction of Charmonia and Total Charmonium-Proton Cross Sections
• Systematics of quarkonium production
• Evidence for simultaneous production of $J/\psi$ and ${\rm Y}$ mesons
• Measurement of inclusive differential cross sections for Upsilon(1S) production in p-pbar collisions at sqrt(s) = 1.96 TeV
• Color-Octet $J/\psi$ Production at Low $p_{\perp }$
• J/Psi Polarization in 800-GeV p-Cu Interactions
• Color-Octet ${\psi }^{\prime }$ Production at Low $p_{\perp }$
• Production of J/psi Mesons in p Be Collisions at 530 and 800 GeV/c
• Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma
• Double-Spin Asymmetry of J/psi Production in Polarized pp Collisions at HERA-$\vec{N}$
• Quarkonium Production through Hard Comover Scattering
• Quarkonium Production through Hard Comover Scattering. II
• Color Octet Contribution to $J/\psi$ Production at a Photon Linear Collider
• Psi' to J/Psi Ratio in Diffractive Photoproduction
• Chi_2 production in polarized pp collisions at RHIC: measuring ΔG and testing the color octet model
• Rescattering Effects in Quarkonium Production
• Quarkonium Polarization in Non-relativistic QCD and the Quark-Gluon Plasma
• Polarized J/psi production from B mesons at the Tevatron
• Double Spin Asymmetries in P-wave Charmonium Hadroproduction
• ${\rm Y}$ Polarization at HERA-$B$
• Hadroproduction of Charmonium at Large $x_F$
• ${\psi }^{\prime }$ productions as a test of color-octet mechanism
• Intrinsic Charm in B-Meson Decays