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Updated: Mar 6, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Fitting Higgs data with nonlinear effective theory.
G Buchalla1, O Catà1, A Celis1
1Fakultät für Physik Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333 München, Germany.
This study validates the electroweak chiral Lagrangian for Higgs anomalous coupling tests, fitting recent Higgs data using an effective field theory (EFT) approach. The findings confirm the formalism
Area of Science:
- High Energy Physics
- Particle Physics
- Quantum Field Theory
Background:
- The electroweak chiral Lagrangian at leading order is equivalent to the [Formula: see text] formalism.
- This formalism is utilized by ATLAS and CMS for Higgs anomalous coupling tests.
Purpose of the Study:
- To fit the latest Higgs data using the validated electroweak chiral Lagrangian.
- To systematically interpret fit parameters within an effective field theory (EFT) framework.
- To generalize the parametrization to next-to-leading order for systematic improvements.
Main Methods:
- Application of the electroweak chiral Lagrangian to fit Higgs data.
- Global Bayesian fit of six relevant parameters: [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text].
- Comparison with linear EFT analysis including dimension-six operators.
Main Results:
- A global Bayesian fit yielded the results: [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text].
- Demonstration of generalizing the leading-order parametrization to next-to-leading order.
Conclusions:
- The conventional [Formula: see text] formalism is well-justified within a Quantum Field Theory (QFT) framework.
- This formalism should remain central for analyzing and interpreting Higgs data.
- The EFT interpretation provides a systematic approach to understanding Higgs data.
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