Amplitudes and partial wave unitarity bounds

Abstract

We develop a formalism, based on spinor-helicity techniques, to generalize the formulation of partial wave unitarity bounds. We discuss unitarity bounds for $N\to M$ (with $N,M\ge 2$) scattering processes -- relevant for high-energy future colliders -- and spin-2 or higher-spin theories -- relevant for effective field theories of gravity -- that are not approachable by standard methods. Moreover, we emphasize the power and complementarity of positivity and partial wave unitarity bounds to constrain the parameter space of effective field theories.

6 pages + appendix, published version

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Cited by in corpus (2)

• Positivity and partial wave unitarity bounds on ALP theories via amplitude methods
• Massive Gauge Theories from Consistency Conditions of Amplitudes