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Determinant Formula for the Octagon Form Factor in N=4 Supersymmetric Yang-Mills Theory
Ivan Kostov1, Valentina B Petkova2, Didina Serban1
1Institut de Physique Théorique, DRF-INP 3681, C.E.A.-Saclay, F-91191 Gif-sur-Yvette, France.
Abstract:
We present a closed expression for the octagon form factor which appears as a building block in a class of four-point correlation functions in N=4 supersymmetric Yang-Mills theory considered recently by Coronado. The octagon form factor is expressed, to all loop orders, as the determinant of a semi-infinite matrix. We find that perturbatively at weak coupling the entries of this matrix are linear combinations of ladder functions with simple rational coefficients.
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