Threshold expansion of the gg(qq) -> QQ+X cross section at O(alpha_s^4)

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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11 pages, 2 figures

Scientific paper

We derive the complete set of velocity-enhanced terms in the expansion of the total cross section for heavy-quark pair production in hadronic collisions at next-to-next-to-leading order. Our expression takes into account the effects of soft-gluon emission as well as that of potential-gluon exchanges. We prove that there are no enhancements due to subleading soft-gluon couplings multiplying the leading Coulomb singularity.

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