Unitarity Bounds and Sum Rules in the Standard Model Effective Field Theory.

Authors

Luigi C Bresciani, Paride Paradisi, Andrea Sainaghi

Published in

Physical review letters. Volume 137. Issue 15. Pages 151801. Oct 09, 2026.

Abstract

We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-6 standard model effective field theory, exploiting a new formalism based on spinor-helicity techniques to derive partial-wave unitarity bounds for generic N→M scattering amplitudes. We find that, in several cases, these theoretical constraints are already competitive with, or even stronger than, the corresponding experimental bounds for energy scales above a few TeV. This is especially the case for four-fermion operators under realistic flavor assumptions, where unitarity bounds can be further strengthened by exploiting sum rules. These results provide a valuable and timely contribution toward the ambitious program of new-physics searches with minimal theoretical priors supplemented by restrictive, yet general, first-principles criteria.

PMID:
42949472
Bibliographic data and abstract were imported from PubMed on 28 Oct 2026.

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