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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Standard Model Physics

Background:

  • Vector-boson scattering is vital for the Large Hadron Collider's physics program.
  • It probes the Standard Model's gauge sector and searches for new physics.
  • Precise Standard Model predictions are essential for interpreting experimental results.

Purpose of the Study:

  • To systematically compare approximations against complete calculations for vector-boson scattering.
  • To evaluate the impact of NLO QCD corrections and parton shower matching on predictions.
  • To provide recommendations for experimental studies of vector-boson scattering.

Main Methods:

  • Comparison of various approximations with complete calculations at leading order (LO) and next-to-leading order (NLO) QCD.
  • Analysis in both fiducial and inclusive phase space regions.
  • Predictions matched to parton showers at LO and NLO.

Main Results:

  • Approximations show significant differences compared to complete calculations, especially in inclusive regions.
  • NLO QCD corrections enhance prediction stability.
  • Parton shower matching introduces larger uncertainties than fixed-order calculations, even in fiducial regions.

Conclusions:

  • NLO QCD corrections are crucial for stable predictions in vector-boson scattering.
  • Careful consideration of parton shower matching procedures is necessary for reliable comparisons.
  • The study provides guidance for experimental analyses at the Large Hadron Collider.