  We find a (nonlocal) gauge where the wavefunction renormalization constant
does not get any corrections for all momenta in the hard-dense loop
approximation. In this gauge, we solve the Schwinger-Dyson equations for the
diquark condensate in dense QCD to calculate the Cooper pair gap. We determine
not only the exponent but also the prefactor of the gap in a gauge independent
way. We find that the higher order corrections increase the gap only by about
1.6 times to the leading order gap at Coulomb gauge.
