Two-Loop Planar Corrections to Heavy-Quark Pair Production in the Quark-Antiquark Channel

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  • 19 June 2009
Abstract
We evaluate the planar two-loop QCD diagrams contributing to the heavy-quark pair production process in the quark-antiquark annihilation channel. The evaluation of these diagrams allows us to obtain an analytic expression for the leading color coefficient in the virtual corrections at order alpha_S^2. We obtain a result which is valid for any value of the Mandelstam invariants s and t, and of the heavy-quark mass m. Our findings agree with previous analytic results in the small-mass limit and numerical results for the exact amplitude.

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