An EFT hunter’s guide to two-to-two scattering: HEFT and SMEFT on-shell amplitudes - INSPIRE

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An EFT hunter’s guide to two-to-two scattering: HEFT and SMEFT on-shell amplitudes

Hongkai Liu
(
- Technion
)
,
Teng Ma
(
- Technion and
- Barcelona, IFAE and
- BIST, Barcelona
)
,
Yael Shadmi
(
- Technion
)
,
Michael Waterbury
(
- Technion
)

Jan 26, 2023

38 pages

Published in:

JHEP 05 (2023) 241

Published: May 31, 2023

e-Print:

2301.11349 [hep-ph]

DOI:

10.1007/JHEP05(2023)241

View in:

ADS Abstract Service

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Abstract: (Springer)

We derive the contact terms contributing to the four-point amplitudes of the standard model particles, keeping terms with up to quartic energy growth. Imposing just the unbroken low-energy symmetry, and treating the electroweak gauge bosons and the Higgs as independent degrees of freedom, we obtain the most general four-point contact-term amplitudes, corresponding to the Higgs Effective Field Theory (HEFT) framework. The contact terms are spanned by a basis of Stripped Contact Terms, which carry the polarization information, multiplied by polynomials in the Mandelstam invariants. For terms with quadratic energy growth, we also derive the low-energy Standard Model Effective Field Theory (SMEFT) predictions, via on-shell Higgsing of the massless SMEFT contact terms. We discuss several aspects of bottom-up versus top-down on-shell derivations of the HEFT and SMEFT amplitudes, highlighting in particular the simple counting of HEFT dimensions in the on-shell approach and the transparent relation between perturbative unitarity and gauge-invariance in the little-group covariant massive spinor formalism. Our results provide a formulation of Effective Field Theory analyses directly in terms of observable quantities. For terms with quadratic energy growth, we also provide the mapping to the Warsaw basis.

Note:

38 pages, 1 figure

Effective Field Theories
Scattering Amplitudes
spinor: massive
effective field theory
contact interaction
unitarity
scattering amplitude
electroweak interaction
covariance
polarization

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