Gluon Scattering: Feynman, Helicity, and CHY Tree Amplitudes

Abstract

Cachazo, He, and Yuan (CHY) proposed in 2013 a new set of formulas for scalar, gluon, and graviton tree amplitudes. These formulas are based on Mobius invariance, no Lagrangian is introduced to specify the interaction, and the Kawai-Lewellan-Tye (KLT) relation between gluon and graviton amplitudes is automatically satisfied. in this lecture, the speaker will discuss the similarities and differences, and the pros and cons, between the CHY formula and the usual calculation based on Feynman diagrams, for the gluon amplitude. Their relation to the spinor helicity technique will also be discussed.

About the program

For more information, please refer to the program website at http://iasprogram.ust.hk/particle_theory.