2021-04-09 11:00  P5A-1

An On-shell Formulation of Chiral Perturbation Theory

Ian Low

We will discuss an entirely on-shell formulation of the mesonic sector of Chiral Perturbation Theory (ChPT), without recourse to the Lagrangian, which is based on recent progresses in understanding the infrared structure of Nambu-Goldstone bosons. The construction provides an efficient method to enumerate the low-energy constants of ChPT, in which operators relations such as those arising from equations of motion, integration-by-parts, hermiticity, and symmetry structure, manifest themselves in simple ways.