Abstract

Jets which are the signatures of quarks and gluons in the detector can be described by Quantum Chromodynamics (QCD) in terms of parton-parton scattering. Jets are abundantly produced at the LHC’s high energy scales. Measurements of inclusive jets, dijets and multijets can be used to test perturbative QCD predictions and to constrain parton distribution functions (PDF), as well as to measure the strong coupling constant αS . The measurements use the samples of proton-proton collisions collected with the CMS detector at the LHC at various center-of-mass energies of 7, 8 and 13 TeV.

Highlights

  • Quantum chromodynamics (QCD) is the theory of strong interaction describing the interactions between quarks and gluons, so called partons

  • The soft QCD takes into account the multiple partonic interaction (MPI), underlying event (UE) and fragmentation whereas the hard QCD takes into account the perturbative QCD theory, parton density functions (PDFs), parton shower modeling and initial and final state radiation (ISR and FSR)

  • The corrected inclusive jet cross section is compared with the predictions from pQCD at next-to-leading order (NLO) using various sets of PDFs

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Summary

Introduction

Quantum chromodynamics (QCD) is the theory of strong interaction describing the interactions between quarks and gluons, so called partons. The soft QCD takes into account the multiple partonic interaction (MPI), underlying event (UE) and fragmentation whereas the hard QCD takes into account the perturbative QCD theory, parton density functions (PDFs), parton shower modeling and initial and final state radiation (ISR and FSR). Many measurements in recent years have been performed for understanding the QCD both in experimental and theoretical aspects. Perturbative calculations at next-to-leading order (NLO) are available for most of the observables and Monte Carlo event generators are tuned more precisely with the measurements. In terms of the experimental side, many measurements have been performed with the data taken with the hadron colliders, which can be used to probe the theory in a large phase space

Soft QCD measurements
Hard QCD measurements
Summary
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