# Precise predictions for dijet production at the LHC

## TL;DR

This paper calculates dijet production at the LHC at NNLO in QCD, improving prediction reliability and comparing results with experimental data, addressing previous scale choice issues at NLO.

## Contribution

It provides the first NNLO calculations for dijet production in all partonic channels and demonstrates improved theoretical predictions over NLO.

## Key findings

- NNLO predictions are more reliable than NLO.
- Scale choice impacts the accuracy of dijet predictions.
- Comparison with ATLAS data shows good agreement.

## Abstract

We present the calculation of dijet production, doubly-differential in dijet mass, $m_{jj}$ and rapidity difference, $|y^{*}|$, at leading colour in all partonic channels at next-to-next-to-leading order (NNLO) in perturbative QCD. We consider the long-standing problems associated with scale choice for dijet production at next-to-leading order (NLO) and investigate the impact of including the NNLO contribution. We find that the NNLO theory provides reliable predictions, even when using scale choices which display pathological behaviour at NLO. We choose the dijet invariant mass as the theoretical scale on the grounds of perturbative convergence and residual scale variation and compare the predictions to the ATLAS 7 TeV 4.5 fb$^{-1}$ data.