Abstract
We study structure constants of local operators inserted on the Wilson loop in \( \mathcal{N}=4 \) super Yang-Mills theory. We conjecture the finite coupling expression of the structure constant which is interpreted as one hexagon with three mirror edges contracted by the boundary states. This is consistent with a holographic description of the correlator as the cubic open string vertex which consists of one hexagonal patch and three boundaries. We check its validity at the weak coupling where the asymptotic expression reduces to the summation over all possible ways of changing the signs of magnon momenta in the hexagon form factor. For this purpose, we compute the structure constants in the SU(2) sector at tree level using the correspondence between operators on the Wilson loop and the open spin chain. The result is nicely matched with our conjecture at the weak coupling regime.
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Kim, M., Kiryu, N. Structure constants of operators on the Wilson loop from integrability. J. High Energ. Phys. 2017, 116 (2017). https://doi.org/10.1007/JHEP11(2017)116
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DOI: https://doi.org/10.1007/JHEP11(2017)116