# Triple Differential Dijet Cross Section at the LHC

## TL;DR

This paper presents the first calculation of second-order perturbative QCD corrections to the triple-differential dijet cross section at the LHC, enabling more precise studies of parton distributions through detailed comparison with CMS data.

## Contribution

It introduces the first computation of second-order QCD corrections for the triple-differential dijet cross section, enhancing the precision of parton density investigations.

## Key findings

- Second-order QCD corrections improve theoretical predictions.
- Shape of the cross section probes parton densities.
- Comparison with CMS data validates the approach.

## Abstract

The measurement of the triple-differential dijet production cross section as a function of the average transverse momentum $p_{T,\textrm{avg}}$, half the rapidity separation $y^{*}$, and the boost $y_{b}$ of the two leading jets in the event enables a kinematical scan of the underlying parton momentum distributions. We compute for the first time the second-order perturbative QCD corrections to this triple-differential dijet cross section, at leading color in all partonic channels, thereby enabling precision studies with LHC dijet data. A detailed comparison with experimental CMS 8 TeV data is performed, demonstrating how the shape of this differential cross section probes the parton densities in different kinematical ranges.