Asymptotic four point functions (Q2317756)

The article considers a topic of recent interest, and the authors provide a great volume of work. They initiated the study of 4-point functions of large BPS operators at any value of the coupling. They have done this by casting it as a sum over exchange of superconformal primaries and by computing the structure constants, based on integrability properties. This part of the article necesitate a big volume of work. Besides, they incorporate the nested Bethe ansatz structure to the hexagon formalism for the three-point functions and obtained a compact formula for the asymptotic structure constant of a non-BPS operator in a higher rank sector. Few relevant diagrams were included to the body of the article.