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hep-ph2026
All-Order Helicity Selection Rules in Effective Field Theories
Luigi C. Bresciani, Nudzeim Selimovic
Using on-shell methods, we derive an all-order non-renormalization theorem for general four-dimensional effective field theories, relying on Poincaré invariance and unitarity. Each…
hep-ph2026
Unitarity bounds and sum rules in the SMEFT
Luigi C. Bresciani, Paride Paradisi, Andrea Sainaghi
We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-six Standard Model Effective Field Theory, exploiting a new formalism based on spinor-heli…