THE ONE-LOOP EFFECTIVE SUPER-POTENTIAL AND NON-HOLOMORPHICITY

We calculate the Kahlerian and the lowest order non-Kahlerian contribu tions to the one-loop effective superpotential using super-Feynman gra phs in the massless Wess-Zumino model, the massive Wess-Zumino model a nd N = 1, U(1) gauge theory. We also calculate the Kahlerian term in Y ang-Mills theory for a general gauge group. Using this latter result w e find the one-loop Kahlerian contribution for N = 2 Yang-Mills theory in terms of N = 1 superfields and we show that it can only come from non-holomorphic contributions to the N = 2 effective potential.