The resummed quark form factor in dimensional regularization

The resummed expression for the quark form factor illustrates the fact that dimensional continuation provides a regularization not only for ultraviole t and infrared singularities of fixed order QCD amplitudes, but also for th e Landau pole arising in resummed calculations. Explicit renormalization gr oup invariant analytic expressions for the logarithm of the form factor are given up to two-loop order in the QCD beta function.