THREE-LOOP BETA-FUNCTIONS FOR THE BOSONIC NON-LINEAR SIGMA MODEL WITH A WESS-ZUMINO-WITTEN TERM
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Abstract
We present the details of an explicit calculation of UV divergences upto three loops of the two-dimensional non-linear sigma model with a Wess-Zumino-Wittcn term and compute a low-energy effective action relevant for string scattering amplitude. -