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A new mechanism for heavy quarkonium production in high-energy collisionscalled the "s-channel cut" was proposed in 2005 by Lansberg, Cudell, andKalinovsky. We identify this mechanism physically as the production of a heavyquark and anti-quark that are on-shell followed by their rescattering toproduce heavy quarkonium. We point out that in the NRQCD factorizationformalism this rescattering mechanism is a contribution to the color-singletmodel term at next-to-next-to-leading order in perturbation theory. Its leadingcontribution to the production rate can be calculated without introducing anyadditional phenomenological parameters. We calculate the charm-pairrescattering (or s-channel cut) contribution to the production of J/psi at theTevatron and compare it to estimates by Lansberg et al. using phenomenologicalmodels. This contribution competes with the leading-order term in thecolor-singlet model at large transverse momentum but is significantly smallerthan the next-to-leading-order term. We conclude that charm-pair rescatteringis not a dominant mechanism for charmonium production in high-energycollisions.

Charm-pair Rescattering Mechanism for Charmonium Production in High-energy Collisions