Hadroproduction and Polarization of Charmonium

Details Hadroproduction and Polarization of Charmonium Hadroproduction and Polarization of Charmonium

1994-10-06

arxiv.org/abs/hep-ph/9410237v1

Phys.Rev.D51:3332-3339,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages

Scientific paper

10.1103/PhysRevD.51.3332

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.

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