Superfield effective action in the noncommutative Wess-Zumino model

We introduce the concept of super-field effective action in noncommutative N = 1 supersymmetric field theories containing chiral superfields. One and two loops low-energy contributions to the effective action are found for the noncommutative Wess-Zumino model. The one loop Kahlerian effective potential coincides with its commutative counterpart. We show that the two loops nonplanar contributions to the Kalerian effective potential are leading in the case of small noncommutativity. The structure of the leading chiral corrections to the effective action and the behaviour of the chiral effective Lagrangian in the limit of large noncommutativity are also investigated. (C) 2001 Elsevier Science B.V. All rights reserved.