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Higher-Order QCD Corrections to Top-Quark Pair Production in Association with a Jet
Simon Badger1, Colomba Brancaccio1, Matteo Becchetti2
1Sezione di Torino, Università di Torino, Arnold-Regge Center, Dipartimento di Fisica and , and INFN, Via P. Giuria 1, I-10125 Torino, Italy.
Physical Review Letters
|July 26, 2026
Summary
This study presents precise predictions for top-quark pair production with a light jet at next-to-next-to-leading order in quantum chromodynamics. These advancements significantly reduce uncertainties, enhancing the standard model
Area of Science:
- High Energy Physics
- Quantum Chromodynamics
- Standard Model Physics
Background:
- Top-quark pair production with a light jet is crucial for studying the Standard Model.
- Precise predictions are needed for top-quark mass measurements and new physics searches.
Purpose of the Study:
- To provide the first predictions for differential cross sections at next-to-next-to-leading order (NNLO) in quantum chromodynamics.
- To analyze the perturbative behavior and reduce uncertainties in these predictions.
Main Methods:
- Calculations performed at NNLO in quantum chromodynamics.
- Two-loop amplitudes evaluated in the leading-color approximation.
- Analysis of perturbative behavior and estimation of missing higher-order contributions.
Main Results:
- First NNLO predictions for various kinematical observables in top-quark pair production with a light jet.
- Substantial reduction of uncertainties arising from missing higher-order contributions.
- Estimates provided for the impact of contributions beyond the leading-color approximation.
Conclusions:
- The presented NNLO predictions offer improved precision for top-quark physics.
- These results are vital for precise Standard Model tests and searches for new physics.
- The methodology provides a framework for further precision calculations in particle physics.
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