Combinatorial Factorization

Understand

The simplest integrands in the CHY formulation of scattering amplitudes are constructed using the so-called Parke-Taylor functions.

• Parke-Taylor functions also turn out to belong to a large class of rational functions known as MHV leading singularities.
• In fact, Parke-Taylor functions correspond to planar MHV leading singularities.
• In this note we study the behavior of CHY integrands constructed using non-planar MHV leading singularities under collinear and multi-particle factorization limits.