  The triple neutral gauge boson and direct U(1)_Y-neutrino interactions, being
absent in ordinary field theory, can arise quite naturally in noncommutative
gauge field theories. Using non-perturbative methods and a Seiberg-Witten map
based covariant approach to noncommutative gauge theory, we have found
theta-exact expressions for both interactions, thereby eliminating previous
restrictions to low-energy phenomena. In particular we obtain for the first
time the covariant, theta-exact, triple neutral gauge boson interactions within
the noncommutative Standard Model gauge sector including an additional
gauge-field deformation freedom. Finally we discuss implications for Z->2gamma
and Z->neutrino-pair decays, and show that our results behave quite reasonably
throughout all interaction energy scales.
