# Full NLO corrections to 3-jet production and R32 at the LHC

## TL;DR

This paper calculates the complete next-to-leading order (NLO) corrections for three-jet production at the LHC, including electroweak effects, and assesses their impact on cross sections and the R32 ratio.

## Contribution

It provides the first comprehensive NLO analysis of three-jet production including electroweak and QED corrections at the LHC.

## Key findings

- Electroweak corrections can exceed -10% at high jet transverse momenta.
- Total cross section corrections are small, below 5% for R32.
- R32 ratio remains stable with minimal electroweak influence.

## Abstract

We present the evaluation of the complete set of NLO corrections to three-jet production at the LHC. To this end we consider all contributions of $\mathcal{O}(\alpha_s^n\alpha^m)$ with $n+m=3$ and $n+m=4$. This includes in particular also subleading Born contributions of electroweak origin, as well as electroweak virtual and QED real-radiative corrections. As an application we present results for the three- over two-jet ratio $R_{32}$. While the impact of non-QCD corrections on the total cross section is rather small, they can exceed $-10\%$ for high jet transverse momenta. The $R_{32}$ observable turns out to be very stable against electroweak corrections, receiving absolute corrections below $5\%$ even in the high-$p_T$ region.