Superconformal Symmetry and Correlation Functions

Abstract

Four-dimensional N-extended superconformal symmetry and correlation functions of quasi-primary superfields are studied within the superspace formalism. A superconformal Killing equation is derived and its solutions are classified in terms of supertranslations, dilations, Lorentz transformations, R-symmetry transformations and special superconformal transformations. In general, due to the invariance under supertranslations and special superconformal transformations, superconformally invariant n-point functions reduce to one unspecified (n-2)-point function which must transform homogeneously under the remaining rigid transformations, i.e. dilations, Lorentz transformations and R-symmetry transformations. Based on this result, we are able to identify all the superconformal invariants and obtain the general form of n-point functions for scalar superfields. In particular, as a byproduct, a selection rule for correlation functions is derived, the existence of which in N=4 super Yang-Mills theory was previously predicted in the context of AdS/CFT correspondence. Superconformally covariant differential operators are also discussed.

1+56 pages, No figure, LaTeX. Reference Added, Selection Rule Generalized, Typos. To be published in Nucl. Phys. B 559: 455, 1999

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• Duality between Wilson loops and gluon amplitudes
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