Study of Topological Distributions of Inclusive Three- and Four-jet Events at the LHC

Ruchi Gupta

doi:10.1016/j.nuclphysbps.2015.10.046

Abstract

A study of inclusive topological distributions of three- and four-jet events has been conducted by the CMS Collaboration at the LHC with a data sample corresponding to an integrated luminosity of 5.1 fb−1 at a centre of mass energy of 7 TeV. Kinematic and angular distributions in inclusive multijet final states serve as a natural probe of quantum chromodynamics and can reveal its inner dynamics. Comparisons are carried out with the data and predictions of leading order calculations and parton shower generators. The compared data results are corrected for detector effects and can be directly compared with other models or next-to-leading order theoretical predictions.

Highlights

A study of inclusive topological distributions of three- and four-jet events has been conducted by the CMS Collaboration at the Large Hadron Collider (LHC) with a data sample corresponding to an integrated luminosity of 5.1 fb−1 at a centre of mass energy of 7 TeV
Kinematic and angular distributions in inclusive multijet final states serve as a natural probe of quantum chromodynamics and can reveal its inner dynamics
The proton-proton collision events with high pT jets serve as a direct test of perturbative Qunatum Chromodynamics

Summary

Introduction

The proton-proton collision events with high pT jets serve as a direct test of perturbative Qunatum Chromodynamics (pQCD). Tests are performed using inclusive three- and four-jet events. In order to study these final states, a class of observables are defined. Many of the QCD event generators utilize the leading order matrix element in the primary 2 → 2 process. These multijet variables are sensitive to the treatment of higher order processes and approximations used in these event generators. Agreement between the measured results and Monte Carlo predictions establishes the validity of the treatment of higher order effects. Any large deviation thereof may lead to large systematic uncertainties on searches of new physics

Definition of variables

Event Selection and Measurement

Results

Findings

10-2 CMS Preliminary 7 TeV