  Recently, loop integrands for certain Yang-Mills scattering amplitudes and
correlation functions have been shown to be systematically expressible in dlog
form, raising the possibility that these loop integrals can be performed
directly without Feynman parameters. We do so here to give a new description of
the planar 1-loop MHV amplitude in N = 4 super Yang-Mills theory. We explicitly
incorporate the standard Feynman i epsilon prescription into the integrands. We
find that the generic MHV diagram contributing to the 1-loop MHV amplitude,
known as Kermit, is dual conformal invariant up to the choice of reference
twistor explicit in our axial gauge (the generic MHV diagram was already known
to be finite). The new formulae for the amplitude are nontrivially related to
previous ones in the literature. The divergent diagrams are evaluated using
mass regularization. Our techniques extend directly to higher loop diagrams,
and we illustrate this by sketching the evaluation of a non-trivial 2-loop
example. We expect this to lead to a simple and efficient method for computing
amplitudes and correlation functions with less supersymmetry and without the
assumption of planarity.
