An Operator Product Expansion for Polygonal null Wilson Loops

Understand

We consider polygonal Wilson loops with null edges in conformal gauge theories.

• We derive an OPE-like expansion when several successive lines of the polygon are becoming aligned.
• The limit corresponds to a collinear, or multicollinear, limit and we explain the systematics of all the subleading corrections, going beyond the leading terms that were previously considered.
• These subleading corrections are governed by excitations of high spin operators, or excitations of a flux tube that goes between two Wilson lines.