# 2014 CAP Congress / Congrès de l'ACP 2014

15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

## Global Sequantial Calibration of jets at ATLAS

16 Jun 2014, 14:15
15m
C-112 (Laurentian University / Université Laurentienne)

### C-112

#### Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Particle Physics / Physique des particules (PPD)

### Speaker

Santiago Batista (University of Toronto (CA))

### Description

In the ATLAS experiment the measurement of hadronic final states usually involves the detection of collimated cones of particles, more simply called *jets*. Despite all the efforts at the hardware and software levels to correctly reconstruct the 4-momenta of jets, there is still room for improvement. Many factors can influence the shapes and amounts of energy deposited in detectors; for example, gluon-initiated and quark-initiated jets have different radiation patterns. A sequential jet calibration based on global properties of jets (Global Sequential Calibration, or GSC) measured by the ATLAS detector was developed to account for these differences. This calibration, based on Monte Carlo studies, aims to reduce the flavour uncertainty and to improve the resolution of jets. In the case of high-energy jets, a correction is introduced to account for the energy lost by jets that are not contained within the calorimeters (leakage). An overview of this calibration and the performance expected is presented. The GSC was derived for $\sqrt{s}=8\mathrm{TeV}$ and jet sizes of R=0.4 and R=0.6.

### Primary author

Santiago Batista (University of Toronto (CA))

### Co-authors

Joseph Peter Kinghorn-Taenzer (University of Toronto (CA)) Reina Coromoto Camacho Toro (Universite de Geneve (CH)) Shaun Gupta (University of Oxford (GB))

 Slides