The QCD form factor of heavy quarks at NNLO

Details The QCD form factor of heavy quarks at NNLO The QCD form factor of heavy quarks at NNLO

2009-05-07

arxiv.org/abs/0905.1137v1

JHEP 0907:001,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex, 37 pages, 4 figures

Scientific paper

10.1088/1126-6708/2009/07/001

We present an analytical calculation of the two-loop QCD corrections to the electromagnetic form factor of heavy quarks. The two-loop contributions to the form factor are reduced to linear combinations of master integrals, which are computed through higher orders in the parameter of dimensional regularization epsilon=(4-D)/2. Our result includes all terms of order epsilon at two loops and extends the previous literature. We apply the exponentiation of the heavy-quark form factor to derive new improved three-loop expansions in the high-energy limit. We also discuss the implications for predictions of massive n-parton amplitudes based on massless results in the limit, where the quark mass is small compared to all kinematical invariants.

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