  Commutative four dimensional supersymmetric Yang-Mills (SYM) is known to be
renormalizable for ${\mathcal N} = 1, 2$, and finite for ${\mathcal N} = 4$.
However, in the noncommutative version of the model the UV/IR mechanism gives
rise to infrared divergences which may spoil the perturbative expansion. In
this work we pursue the study of the consistency of the ${\cal N} = 1, 2, 4$
noncommutative supersymmetric Yang-Mills theory with gauge group U(N) (NCSYM).
We employ the covariant superfield framework to compute the one-loop
corrections to the two- and three-point functions of the gauge superfield $V$.
It is found that the cancellation of the harmful UV/IR infrared divergences
only takes place in the fundamental representation of the gauge group. We argue
that this is in agreement with the low energy limit of the open superstring in
the presence of an external magnetic field. As expected, the planar sector of
the two-point function of the $V$ superfield exhibits UV divergences. They are
found to cancel, in the Feynman gauge, for the maximally extended ${\cal N} =
4$ supersymmetric theory. This gives support to the belief that the ${\cal N} =
4$ NCSYM theory is UV finite.

High Energy Physics - Theory