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The SMEFTsim package, theory and tools
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abstract
We report codes for the Standard Model Effective Field Theory (SMEFT) in FeynRules -- the SMEFTsim package. The codes enable theoretical predictions for dimension six operator corrections to the Standard Model using numerical tools, where predictions can be made based on either the electroweak input parameter set $\{\hat{\alpha}_{ew}, \hat{m}_Z, \hat{G}_F \}$ or $\{\hat{m}_{W}, \hat{m}_Z, \hat{G}_F\}$. All of the baryon and lepton number conserving operators present in the SMEFT dimension six Lagrangian, defined in the Warsaw basis, are included. A flavour symmetric ${\rm U}(3)^5$ version with possible non-SM $\rm CP$ violating phases, a (linear) minimal flavour violating version neglecting such phases, and the fully general flavour case are each implemented. The SMEFTsim package allows global constraints to be determined on the full Wilson coefficient space of the SMEFT. As the number of parameters present is large, it is important to develop global analyses on reduced sets of parameters minimizing any UV assumptions and relying on IR kinematics of scattering events and symmetries. We simultaneously develop the theoretical framework of a "W-Higgs-Z pole parameter" physics program that can be pursued at the LHC using this approach and the SMEFTsim package. We illustrate this methodology with several numerical examples interfacing SMEFTsim with MadGraph5. The SMEFTsim package can be downloaded at https://feynrules.irmp.ucl.ac.be/wiki/SMEFT
Forward citations
Cited by 9 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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Enhancing anomaly detection with topology-aware autoencoders
Autoencoders with latent spaces shaped like S^2, S^2×S^2, or RP^2, matched to the phase-space topology of the background, reduce spurious reconstruction errors and give a small but consistent anomaly-detection gain ov...
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Measurements of the electroweak production of a $W$ boson in association with two jets at $\sqrt{s}=13\,\mathrm{TeV}$ with the ATLAS detector
First differential electroweak W+two-jet cross sections at 13 TeV agree with the Standard Model and give competitive constraints on anomalous triple-gauge-boson couplings.
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Anomalous triple gauge couplings in the light of dimension-8 operators in $W^+W^-$
Bosonic dimension-8 operators in γγ-initiated WW production dominate over qqbar and set the practical EFT validity scale, yielding validity-aware constraints on dimension-6 Wilson coefficients.
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Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Combined ATLAS Higgs measurements find no CP violation and set the strongest simultaneous SMEFT limits on three CP-odd Wilson coefficients.
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One-Loop Calculations in Effective Field Theories with GoSam-3.0
GoSam-3.0 extends automated one-loop amplitude generation to SMEFT and HEFT with flexible truncation orders, loop-suppression counting, and improved speed and stability.
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$\mathcal{CP}$-Analyses with Symbolic Regression
Symbolic regression produces analytic, detector-level CP-odd observables for WBF Higgs production and an analytic reconstruction of the Collins-Soper angle in ttH that are competitive with black-box ML and classical methods.
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Counting b-jets at the FCC-ee as a probe of top-quark flavor physics
FCC-ee at 240 GeV can probe Λ_eff ∼ 7–13 TeV for scalar, vector and tensor eetu/eetc operators by counting b_P-odd single-b-jet multi-jet events.
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Future Collider Perspectives on Higgs CP Violation
Simulated future-collider studies project that FCC-ee and FCC-hh could constrain CP-violating Higgs EFT couplings 10-100 times more tightly than the HL-LHC, with the proton-proton machine strongest overall.
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