Abstract
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 
= (4−D)/2.
Our result includes all terms of order 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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