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Threshold expansion of the gg(qq) -> QQ+X cross section at O(alpha_s⁴)

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arxiv 0911.5166 v2 pith:46Q24FNA submitted 2009-11-26 hep-ph

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

classification hep-ph
keywords crossexpansionsectionsoft-gluonaccountalphacollisionscomplete
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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