Measurements of jet multiplicity and jet transverse momentum in multijet events in proton-proton collisions at $\sqrt{s}$ = 13 TeV

TL;DR

This paper presents detailed measurements of jet multiplicities and transverse momentum distributions in multijet events at 13 TeV proton-proton collisions, providing data to test quantum chromodynamics predictions.

Contribution

It offers the first comprehensive comparison of multijet measurements with advanced theoretical calculations including NLO and TMD approaches.

Findings

Measurements agree with NLO calculations within uncertainties.

Data constrains models of parton shower and multiparton interactions.

Results improve understanding of jet production mechanisms at high energies.

Abstract

Multijet events at large transverse momentum ($p_\mathrm{T}$) are measured at $\sqrt{s}$ = 13 TeV using data recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 36.3 fb$^{-1}$. The multiplicity of jets with $p_\mathrm{T}$ $>$ 50 GeV that are produced in association with a high-$p_\mathrm{T}$ dijet system is measured in various ranges of the $p_\mathrm{T}$ of the jet with the highest transverse momentum and as a function of the azimuthal angle difference $\Delta\phi_{1,2}$ between the two highest $p_\mathrm{T}$ jets in the dijet system. The differential production cross sections are measured as a function of the transverse momenta of the four highest $p_\mathrm{T}$ jets. The measurements are compared with leading and next-to-leading order matrix element calculations supplemented with simulations of parton shower, hadronization, and multiparton interactions. In addition, the measurements are compared with next-to-leading order matrix element calculations combined with transverse-momentum dependent parton densities and transverse-momentum dependent parton shower.