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SMEFiT: a flexible toolbox for global interpretations of particle physics data with effective field theories
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The Standard Model Effective Field Theory (SMEFT) provides a robust framework to interpret experimental measurements in the context of new physics scenarios while minimising assumptions on the nature of the underlying UV-complete theory. We present the Python open source SMEFiT framework, designed to carry out parameter inference in the SMEFT within a global analysis of particle physics data. SMEFiT is suitable for inference problems involving a large number of EFT degrees of freedom, without restrictions on their functional dependence in the fitted observables, can include UV-inspired restrictions in the parameter space, and implements arbitrary rotations between operator bases. Posterior distributions are determined from two complementary approaches, Nested Sampling and Monte Carlo optimisation. SMEFiT is released together with documentation, tutorials, and post-analysis reporting tools, and can be used to carry out state-of-the-art EFT fits of Higgs, top quark, and electroweak production data. To illustrate its functionalities, we reproduce the results of the recent ATLAS EFT interpretation of Higgs and electroweak data from Run II and demonstrate how equivalent results are obtained in two different operator bases.
Forward citations
Cited by 7 Pith papers
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EFT Validity and Truncation Uncertainty from few Nuisance Parameters
SMEFT truncation uncertainty at O(Λ^{-4}) can be modeled by K≪N representative Wilson coefficients plus a decorrelated α=√2 PCA prior that covers full next-order effects in DY, Zh, and VBF.
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Hot news on the phase structure of the SMEFT
A full O(g^4) dimensional reduction of the dimension-six SMEFT shows that the top-Higgs operator O_tphi can trigger a first-order electroweak phase transition with zero (phi-dagger phi)^3 coupling at zero temperature.
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Descoped and Upscoped FCC-ee Running Scenarios in the SMEFT
A descoped FCC-ee retains most of its SMEFT reach if a reduced-luminosity top-quark run is kept, while upscoped luminosity increases barely improve the global fit.
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Language-Guided Hypotheses Generation for Sparse SMEFT Analyses
A locally running LLM plus retrieval-augmented generation proposes sparse SMEFT operator hypotheses from precomputed fit summaries, with a growing knowledge base and interactive user feedback.
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On the Robustness of type-II Seesaw Collider Searches
Adding a single effective operator that makes the doubly charged Higgs decay into two leptons and a photon weakens current ATLAS limits from ~1.1 TeV to ~0.7 TeV, but requiring a hard photon in the final state restore...
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Tailored PDFs for New Physics searches
Using closure tests with W', Z', and coloron models, the paper shows that either excluding high-energy data or fitting PDFs jointly with SMEFT coefficients prevents new-physics signals from being absorbed into the pro...
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Unbinning global LHC analyses
Simulation-based inference produces stronger combined LHC constraints on SMEFT Wilson coefficients than histogram-based inference for four di-boson processes.
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