Performance of jets at CMS

16th International Conference on Calorimetry in High Energy Physics

Schröder, Matthias^1

Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, Hamburg

22607, Germany^1

关键词: Centre-of-mass energies;    Integrated luminosity;    Mitigation techniques;    Proton proton collisions;    Pseudorapidities;    Sources of uncertainty;    State of the art;    Tracking system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/587/1/012004/pdf
DOI  :  10.1088/1742-6596/587/1/012004

来源: IOP

【 摘 要 】

The calibration and reconstruction of jets critically relies on the performance of the calorimeters. Extending out to large pseudorapidities, the measurements depend on the interplay between forward calorimeters, central calorimeters, and the tracking system. The high number of additional pile-up interactions poses further complications. In CMS, these difficulties are overcome using the 'particle-flow' approach, which aims at reconstructing individually each particle in the event prior to the jet clustering. Measurements of the jet energy scale and the procedure for jet energy calibration in CMS are reviewed, which are performed with dijet, photon + jet, and Z+jet data collected in proton-proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.6 fb-1. The effect of pile-up interactions and the state of the art mitigation techniques used in CMS as well as the main sources of uncertainty of the jet energy calibration are also presented.