CMS results on multijet correlations

TL;DR

This paper reports on CMS measurements of multijet correlations at the LHC, comparing experimental data with theoretical models and exploring jet cross sections at different energies and conditions.

Contribution

It provides new experimental data on multijet correlations and cross sections, and evaluates various theoretical models against these measurements.

Findings

Azimuthal correlations in dijets separated by up to 9.4 units in rapidity.

Cross sections for jets with pT > 21 GeV and track-jets with pT > 1 GeV.

Sensitivity of minijet results to the inelastic cross section bounds.

Abstract

We present recent measurements of multijet correlations using forward and low-$p_{\mathrm{T}}$ jets performed by the CMS collaboration at the LHC collider. In pp collisions at $\sqrt{s} = 7$ TeV, azimuthal correlations in dijets separated in rapidity by up to 9.4 units were measured. The results are compared to BFKL- and DGLAP-based Monte Carlo generator and analytic predictions. In pp collisions at $\sqrt{s} = 8$ TeV, cross sections for jets with $p_{\mathrm{T}}$ > 21 GeV and |y| < 4.7, and for track-jets with $p_{\mathrm{T}}$ > 1 GeV (minijets) are presented. The minijet results are sensitive to the bound imposed by the total inelastic cross section, and are compared to various models for taming the growth of the $2 \rightarrow 2$ cross section at low $p_{\mathrm{T}}$.