Non-planar form factors of generic local operators via on-shell unitarity and color-kinematics duality

Understand

Form factors, as quantities involving both local operators and asymptotic particle states, contain information of both the spectrum of operators and the on-shell amplitudes.

• So far the studies of form factors have been mostly focused on the large Nc planar limit, with a few exceptions of Sudakov form factors.
• In this paper, we discuss the systematical construction of full color dependent form factors with generic local operators.
• We study the color decomposition for form factors and discuss the general strategy of using on-shell unitarity cut method.