Quarkonium-Hadron Interactions in Perturbative QCD

Details Quarkonium-Hadron Interactions in Perturbative QCD Quarkonium-Hadron Interactions in Perturbative QCD

2005-01-27

arxiv.org/abs/hep-ph/0501252v2

Phys.Rev. D72 (2005) 034002

Physics

High Energy Physics

High Energy Physics - Phenomenology

Yonsei University. to be published in PRD

Scientific paper

10.1103/PhysRevD.72.034002

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.

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