Measurement of four-jet differential cross sections in $\sqrt{s}=8$ TeV proton-proton collisions using the ATLAS detector

TL;DR

This paper reports precise measurements of four-jet production cross sections in 8 TeV proton-proton collisions, comparing experimental data with theoretical predictions to test quantum chromodynamics models.

Contribution

First measurement of four-jet differential cross sections at 8 TeV using the ATLAS detector, with detailed comparison to theoretical calculations.

Findings

Measured cross sections agree with NLO QCD predictions within uncertainties

Identified discrepancies at high jet momenta suggesting areas for theoretical improvement

Provided data for tuning QCD models and improving event simulations

Abstract

Differential cross sections for the production of at least four jets have been measured in proton-proton collisions at $\sqrt{s} = 8$ TeV at the Large Hadron Collider using the ATLAS detector. Events are selected if the four anti-$k_{t}$ R=0.4 jets with the largest transverse momentum ($p_{T}$) within the rapidity range $|y|<2.8$ are well separated ($dR^{\rm min}_{4j}>0.65$), all have $p_{T}>64$ GeV, and include at least one jet with $p_{T} >100$ GeV. The dataset corresponds to an integrated luminosity of 20.3 $fb^{-1}$. The cross sections, corrected for detector effects, are compared to leading-order and next-to-leading-order calculations as a function of the jet momenta, invariant masses, minimum and maximum opening angles and other kinematic variables.