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Combined EFT interpretation of top quark, Higgs boson, electroweak and QCD measurements at CMS

Niels Van den Bossche

TL;DR

This work presents a CMS-scale SMEFT interpretation that aggregates measurements across top quark, Higgs boson, electroweak, and QCD sectors, augmented by LEP/SLC EWPOs, to constrain Wilson Coefficients in a $64$-operator, dimension-6 SMEFT framework. The analysis fits both individual WCs and a set of $42$ linear combinations by diagonalizing the Hessian, retaining components with eigenvalues above $0.04$, and uses SMEFTSim3 and SMEFT@NLO to model EFT effects. Two main results are reported: (i) single-WC fits with linear and quadratic contributions, and (ii) a simultaneous fit to the principal components, accommodating degeneracies among operators. No significant deviations from the SM are observed, and the study demonstrates the feasibility and robustness of incorporating full likelihoods and quadratic terms in a CMS-wide EFT combination, providing stringent SMEFT constraints that inform future new-physics searches.

Abstract

A recent EFT result from CMS is presented, combining differential cross section and direct EFT measurements performed by the CMS Collaboration across four branches of the Standard Model: top, Higgs, electroweak and QCD physics. To maximize the sensitivity, measurements of electroweak precision observables from LEP and SLC are included as well. 64 Wilson Coefficients (WC) are targeted in this combined measurement, both individually and with a simultaneous fit to 42 linear combinations of the Wilson Coefficients.

Combined EFT interpretation of top quark, Higgs boson, electroweak and QCD measurements at CMS

TL;DR

This work presents a CMS-scale SMEFT interpretation that aggregates measurements across top quark, Higgs boson, electroweak, and QCD sectors, augmented by LEP/SLC EWPOs, to constrain Wilson Coefficients in a -operator, dimension-6 SMEFT framework. The analysis fits both individual WCs and a set of linear combinations by diagonalizing the Hessian, retaining components with eigenvalues above , and uses SMEFTSim3 and SMEFT@NLO to model EFT effects. Two main results are reported: (i) single-WC fits with linear and quadratic contributions, and (ii) a simultaneous fit to the principal components, accommodating degeneracies among operators. No significant deviations from the SM are observed, and the study demonstrates the feasibility and robustness of incorporating full likelihoods and quadratic terms in a CMS-wide EFT combination, providing stringent SMEFT constraints that inform future new-physics searches.

Abstract

A recent EFT result from CMS is presented, combining differential cross section and direct EFT measurements performed by the CMS Collaboration across four branches of the Standard Model: top, Higgs, electroweak and QCD physics. To maximize the sensitivity, measurements of electroweak precision observables from LEP and SLC are included as well. 64 Wilson Coefficients (WC) are targeted in this combined measurement, both individually and with a simultaneous fit to 42 linear combinations of the Wilson Coefficients.
Paper Structure (4 sections, 3 figures)

This paper contains 4 sections, 3 figures.

Table of Contents

  1. Introduction
  2. Input analyses
  3. Combined EFT interpretation
  4. Conclusion

Figures (3)

  • Figure 1: The binned events classification in the dedicated multilepton top EFT analysis CMS:TOP-22-006.
  • Figure 2: The obtained limits on individual WCs, with and without taking into account the EFT contribution quadratic in the WC CMS:SMP-24-003.
  • Figure 3: The obtained limits on the various linear combinations of WCs. Only the contribution linear in the WC are considered CMS:SMP-24-003.