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

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