Recursion Relations for Tree-level Amplitudes in the SU(N) Non-linear Sigma Model

Abstract

It is well-known that the standard BCFW construction cannot be used for on-shell amplitudes in effective field theories due to bad behavior for large shifts. We show how to solve this problem in the case of the SU(N) non-linear sigma model, i.e. non-renormalizable model with infinite number of interaction vertices, using scaling properties of the semi-on-shell currents, and we present new on-shell recursion relations for all on-shell tree-level amplitudes in this theory.

4 pages, 2 figures

References in corpus (3)

• The All-Loop Integrand For Scattering Amplitudes in Planar N=4 SYM
• On-shell constructibility of tree amplitudes in general field theories
• Three Applications of a Bonus Relation for Gravity Amplitudes