An Operator Product Expansion for Form Factors III. Finite Coupling and Multi-Particle Contributions

Abstract

Form factors in planar $\mathcal{N}=4$ super-Yang-Mills theory have a dual description in terms of periodic Wilson loops. This duality maps the multi-collinear expansion of the former to an operator product expansion of the latter. The coefficients of this expansion are decomposed in terms of several elementary building blocks and can be determined at finite 't Hooft coupling using bootstrap and integrability techniques. Some of these blocks are known from an analogous expansion of scattering amplitudes. In addition to these, the expansion for form factors includes a new type of building block, called {\it form factor transitions}, that encode information about the local operator. In the present paper, we consider the form factor of the chiral part of the stress-tensor supermultiplet. We bootstrap the corresponding form factor transitions of two-particle flux-tube states and use them to predict the leading term in the collinear expansion at finite coupling. The transitions we find can be expressed in terms of a quantity that previously appeared in a seemingly unrelated context, namely the octagon kernel. Lastly, we use a factorized ansatz to determine the multi-particle form factor transitions at finite coupling, which we use to predict the first subleading term in the collinear expansion. A perfect match is found between our predictions and the available perturbative data.

arXiv comment36 pages, 4 figures, v2: typos fixed and a reference added, matches published version

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• Wilson Loop Duality and OPE for Super Form Factors of Half-BPS Operators
• TBA-like equations for non-planar scattering amplitude/Wilson lines duality at strong coupling
• A Two-Loop Four-Point Form Factor at Function Level
• Deciphering the Maximal Transcendentality Principle via Bootstrap
• Exploring superconformal Yang-Mills theories through matrix Bessel kernels
• New relations for tree-level form factors and scattering amplitudes
• Analytic two-Loop four-point form factor of the stress-tensor supermultiplet in $\mathcal{N}=4$ SYM
• Analytic Four-Point Lightlike Form Factors and OPE of Null-Wrapped Polygons