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We calculated CP conserving contributions to Higgs boson decays into two photons using dimension-six operators. These calculations impact the interpretation of experimental bounds in the Standard Model Effective Field Theory.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Field Theory

Background:

  • The Standard Model (SM) of particle physics describes fundamental particles and forces.
  • Deviations from SM predictions may indicate new physics beyond the SM.
  • Higgs boson decays, such as to two photons (h→γγ), are sensitive probes of new physics.

Purpose of the Study:

  • To calculate CP conserving contributions to the Higgs boson decay width into two photons (Γ(h→γγ)).
  • To incorporate dimension-six operators at one-loop order within the linear Standard Model Effective Field Theory (SMEFT).
  • To analyze the impact of these higher-order corrections on experimental constraints.

Main Methods:

  • Employing the linear Standard Model Effective Field Theory (SMEFT) framework.
  • Calculating one-loop order contributions from dimension-six operators.
  • Focusing on CP conserving interactions relevant to the h→γγ decay.

Main Results:

  • Quantified the CP conserving contributions to Γ(h→γγ) from dimension-six operators at one-loop.
  • Demonstrated how these corrections modify the theoretical prediction for the decay rate.
  • Identified specific impacts on the interpretation of experimental data.

Conclusions:

  • The calculated corrections are crucial for precise theoretical predictions.
  • These results refine the interpretation of current and future experimental bounds on Higgs boson properties.
  • The study highlights the importance of higher-order calculations in SMEFT for discovering new physics.