Conformal Anomaly for Amplitudes in N=6 Superconformal Chern-Simons Theory

Abstract

Scattering amplitudes in three-dimensional N=6 Chern-Simons theory are shown to be non-invariant with respect to the free representation of the osp(6|4) symmetry generators. At tree and one-loop level these "anomalous" terms occur only for non-generic, singular configurations of the external momenta and can be used to determine the form of the amplitudes. In particular we show that the symmetries predict that the one-loop six-point amplitude is non-vanishing and confirm this by means of an explicit calculation using generalized unitarity methods. We comment on the implications of this finding for any putative Wilson loop/amplitude duality in N=6 Chern-Simons theory.

arXiv comment29 pages, 9 figures, 1 table; v2: made section 4 more rigorous, minor improvements, references added; v3: added comment and reference on normalization, published in J.Phys.A

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• Perturbative Methods for Superconformal Quantum Field Theories in String - Gauge Theory Dualities
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