Quarkonium Production through Hard Comover Scattering
arXiv:hep-ph/9806424 · doi:10.1103/PhysRevD.59.034011
Abstract
We propose a qualitatively new mechanism for quarkonium production, motivated by the global features of the experimental data and by the successes/failures of existing models. In QCD, heavy quarks are created in conjunction with a bremsstrahlung color field emitted by the colliding partons. We study the effects of perturbative gluon exchange between the quark pair and a comoving color field. Such scattering can flip the spin and color of the quarks to create a non-vanishing overlap with the wave function of physical quarkonium. Several observed features that are difficult to understand in current models find simple explanations. Transverse gluon exchange produces unpolarized J/psi's, the chi_c1 and chi_c2 states are produced at similar rates, and the anomalous dependence of the J/psi cross section on the nuclear target size can be qualitatively understood.
13 pages, Latex. The postscript file may be also found at http://www.nordita.dk/Level1/Level2/Research/preprints.html
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