Quarkonium-Hadron Interactions in Perturbative QCD

Abstract

The next to leading order (NLO) quarkonium-hadron cross section is calculated in perturbative QCD. The corresponding leading order (LO) result was performed by Peskin more than 20 years ago using the operator product expansion (OPE). In this work, the calculation is performed using the Bethe-Salpeter amplitude and the factorization formula. The soft divergence appearing in the intermediate stages of the calculations are shown to vanish after adding all possible crossed terms, while the collinear divergences are eliminated by mass factorization. Applying the result to the Upsilon system, one finds that there are large higher order correction near the threshold. The relevance of the present result to the charmonium case is also discussed.

Yonsei University. to be published in PRD

References in corpus (3)

• Dissociation cross sections of ground-state and excited charmonia with light mesons in the quark model
• Progress in the determination of the $J/\psi -\pi$ cross section
• $J/\psi$ dissociation by pions in QCD

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