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Precise predictions for same-sign W-boson scattering at the LHC
Alessandro Ballestrero1, Benedikt Biedermann2, Simon Brass3
11INFN, Sezione di Torino, Via P. Giuria 1, 10125 Turin, Italy.
The European Physical Journal. C, Particles and Fields
|September 4, 2018
Summary
Accurate predictions for vector-boson scattering at the Large Hadron Collider are crucial for uncovering new physics. This study compares calculation methods, finding NLO QCD corrections improve stability but parton shower matching introduces significant variations.
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.
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