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arXiv · 1704.04758

Four dimensional ambitwistor strings and form factors of local and Wilson line operators

L. V. Bork·A. I. Onishchenko
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Abstract

We consider the description of form factors of local and Wilson line operators (reggeon amplitudes) in N=4 SYM within the framework of four dimensional ambitwistor string theory. We present the explicit expressions for string composite operators corresponding to stress-tensor operator supermultiplet and Wilson line operator insertion. It is shown, that corresponding tree-level string correlation functions correctly reproduce previously obtained Grassmannian integral representations. As by product we derive four dimensional tree-level scattering equations representations for the mentioned form factors and formulate a simple gluing procedure used to relate operator form factors with on-shell amplitudes.

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L. V. Bork, A. I. Onishchenko. 2017-04-16. Four dimensional ambitwistor strings and form factors of local and Wilson line operators. https://doi.org/10.1103/physrevd.97.126013

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