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Constraining Gluonic Quartic Gauge Coupling Operators with gg→γγ.

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  • 1Theoretical Particle Physics and Cosmology Group, Physics Department, King's College London, London WC2R 2LS, United Kingdom, National Institute of Chemical Physics and Biophysics, Rävala 10, 10143 Tallinn, Estonia, and Theoretical Physics Department, CERN, CH-1211 Geneva 23, Switzerland.

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Gluon-gluon to photon-photon scattering probes high-energy physics beyond the Standard Model. ATLAS data sets lower limits on dimension-8 operators at M≳1 TeV, with future colliders offering enhanced sensitivity.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Field Theory

Background:

  • The Standard Model Effective Field Theory (SMEFT) extends the Standard Model by incorporating higher-dimensional operators.
  • Dimension-8 operators, quadratic in field-strength tensors, probe new physics beyond the Standard Model.
  • The Born-Infeld extension is a theoretical framework that can generate such operators.

Purpose of the Study:

  • To utilize gluon-gluon to photon-photon scattering (gg→γγ) as a probe for dimension-8 operators in SMEFT.
  • To set experimental limits on the energy scale of these operators using LHC data.
  • To explore the future sensitivity of hadron colliders to these phenomena.

Main Methods:

  • Analysis of 13-TeV ATLAS data focusing on the production of isolated photon pairs.
  • Comparison of experimental results with theoretical predictions for gg→γγ scattering.
  • Calculation of lower limits on the mass scale (M) of dimension-8 operators.

Main Results:

  • Lower limits on the scales of dimension-8 operators are established at M≳1 TeV.
  • The gg→γγ process is confirmed as a sensitive probe for new physics at the TeV scale.
  • The study provides a baseline for future precision measurements.

Conclusions:

  • The ATLAS experiment has constrained new physics scenarios involving dimension-8 operators.
  • Future hadron colliders hold significant potential for improving these constraints.
  • This research contributes to the ongoing search for physics beyond the Standard Model.