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Worldsheet form factors in AdS/CFT

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The study of the worldsheet S-matrix for AdS_5×S^5
strings was a key step in

the complete determination of the non-pertubrative planar
spectrum of anomalous

dimensions for N=4 super-Yang-Mills. To go beyond
the spectral problem it is

important to consider higher-point
worldsheet correlation functions and, as is

standard in many integrable models, one approach is
the study of form factors.

We will discuss a set of consistency conditions appropriate
to form factors in

the light-cone gauge
fixed AdS_5×S^5 string theory. We further
discuss the 

form factors in the weakly coupled dual description,
verifying that the relevant conditions naturally hold for the one-loop Heisenberg