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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.

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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

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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.