Theory Predictions for the Pull Angle

Understand

Pull is a jet observable that is sensitive to color flow between dipoles.

• It has seen wide use for discrimination of particles with similar decay topologies but carrying different color representations and has been measured on W bosons from top quark decays by the D$\emptyset$ and ATLAS experiments.
• In this paper, we present the first theoretical predictions of pull, focusing on a color-singlet decaying in two jets.
• The pull angle observable is particularly sensitive to color flow, but is not infrared and collinear safe and so cannot be calculated in fixed-order perturbation theory.