Abstract
We examine a certain 16-fermion correlator in N=4 supersymmetric SU( N) gauge theory in 4 dimensions. Generalizing recent SU(2) results of Bianchi, Green, Kovacs and Rossi, we calculate the exact N-dependence of the effective 16-fermion vertex at the 1-instanton level, and find precise agreement in the large- N limit with the prediction of the type IIB superstring on AdS 5× S 5. This suggests that the string theory prediction for the 1-instanton amplitude considered here is not corrected by higher-order terms in the α′ expansion.
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