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Dimension-Six Terms in the Standard Model Lagrangian

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abstract

When the Standard Model is considered as an effective low-energy theory, higher dimensional interaction terms appear in the Lagrangian. Dimension-six terms have been enumerated in the classical article by Buchmueller and Wyler [3]. Although redundance of some of those operators has been already noted in the literature, no updated complete list has been published to date. Here we perform their classification once again from the outset. Assuming baryon number conservation, we find 15 + 19 + 25 = 59 independent operators (barring flavour structure and Hermitian conjugations), as compared to 16 + 35 + 29 = 80 in Ref.[3]. The three summed numbers refer to operators containing 0, 2 and 4 fermion fields. If the assumption of baryon number conservation is relaxed, 4 new operators arise in the four-fermion sector.

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Exploring the SMEFT landscape: Bayesian Model Selection for indirect discovery

hep-ph · 2026-05-20 · unverdicted · novelty 7.0

Bayesian model selection over SMEFT operator subsets using a genetic algorithm and BIC approximation is applied to electroweak, Higgs, top and diboson data, finding no evidence for new physics and improved Wilson coefficient posteriors compared to global fits.

Hierarchies from Higher Flavor Spin

hep-ph · 2026-05-14 · unverdicted · novelty 7.0

Yukawa hierarchies are generated from powers of fully anarchic spurions in higher SU(2) and SU(3) flavor representations via progressive rank lifting through composite outer products, with explicit models and predictions for FCNCs and stochastic gravitational waves.

When Two Loops Matter: Electroweak Precision in the SMEFT

hep-ph · 2026-04-29 · unverdicted · novelty 7.0

A modification to the top-Higgs Yukawa coupling in SMEFT induces a two-loop shift in the W mass through a large anomalous dimension, providing a new indirect probe via electroweak precision observables.

Weak Scale Triggers in the SMEFT

hep-ph · 2025-12-11 · unverdicted · novelty 6.0

No weak scale triggers exist in the SMEFT up to dimension six (and likely eight) that can solve the hierarchy problem far above the weak scale.

Amplitudes and partial wave unitarity bounds

hep-ph · 2025-04-17 · unverdicted · novelty 6.0

Develops spinor-helicity formalism generalizing partial wave unitarity bounds for multi-particle scattering and spin-2 or higher-spin theories.

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