Study of hadronic event-shape variables in multijet final states in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper investigates hadronic event-shape variables in multijet proton-proton collisions at 7 TeV, comparing experimental data with QCD Monte Carlo predictions to understand perturbative and nonperturbative effects.

Contribution

It provides a detailed comparison of event-shape variable distributions in multijet events with various QCD Monte Carlo models at 7 TeV.

Findings

Distributions are sensitive to QCD effects.

Monte Carlo models show varying degrees of agreement.

Results help refine QCD modeling in collider experiments.

Abstract

Event-shape variables, which are sensitive to perturbative and nonperturbative aspects of quantum chromodynamic (QCD) interactions, are studied in multijet events recorded in proton-proton collisions at sqrt(s) = 7 TeV. Events are selected with at least one jet with transverse momentum pt > 110 GeV and pseudorapidity abs(eta) < 2.4, in a data sample corresponding to integrated luminosities of up to 5 inverse femtobarns. The distributions of five event-shape variables in various leading jet pt ranges are compared to predictions from different QCD Monte Carlo event generators.