Hadronic Event Shapes at CMS

Abstract

In this note, a study of hadronic event shapes in QCD events at the Large Hadron Collider (LHC) is shown. The study is based on a GEANT detector simulation of the Compact Muon Solenoid (CMS) detector. Calorimetric jet momenta, determined by the k T jet clustering algorithm, are used as input for calculating various event-shape variables, which probe the structure of the hadronic final state. It is shown that the normalized event-shape distributions are robust under variations of the jet energy scale and resolution effects, which makes them particularly suitable for early data analysis and tuning of Monte Carlo models. are robust under variations of the jet energy scale and resolution effects, which makes them particularly suitable for early data analysis and tuning of Monte Carlo models.