  We introduce an N=8 supersymmetric extension of the Bogomolny-type model for
Yang-Mills-Higgs fields in 2+1 dimensions related with twistor string theory.
It is shown that this model is equivalent to an N=8 supersymmetric U(n) chiral
model in 2+1 dimensions with a Wess-Zumino-Witten-type term. Further reduction
to 1+1 dimensions yields N=(8,8) supersymmetric extensions of the standard U(n)
chiral model and Grassmannian sigma models.

High Energy Physics - Theory