Recursion relations for tree-level amplitudes in the S U ( N ) nonlinear sigma model
2013; American Physical Society; Volume: 87; Issue: 8 Linguagem: Inglês
10.1103/physrevd.87.081701
ISSN1550-7998
AutoresKarol Kampf, Jiří Novotný, Jaroslav Trnka,
Tópico(s)Particle physics theoretical and experimental studies
ResumoIt 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.
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