A measurement of the calorimeter response to single hadrons and determination of the jet energy scale uncertainty using LHC Run-1 pp-collision data with the ATLAS detector

ATLAS; F. MONTICELLI

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2017

1434-6044

A measurement of the calorimeter response to isolated charged hadrons in the ATLAS de-tector at the LHC is presented. This measurement is performed with 3.2 nb −1 of proton?√√proton collision data at s = 7 TeV from 2010 and 0.1 nb −1 of data at s = 8 TeV from2012. A number of aspects of the calorimeter response to isolated hadrons are explored.After accounting for energy deposited by neutral particles, there is a 5% discrepancy in themodelling, using various sets of Geant4 hadronic physics models, of the calorimeter re-sponse to isolated charged hadrons in the central calorimeter region. The description of theresponse to anti-protons at low momenta is found to be improved with respect to previousanalyses. The electromagnetic and hadronic calorimeters are also examined separately, andthe detector simulation is found to describe the response in the hadronic calorimeter well.The jet energy scale uncertainty and correlations in scale between jets of different momentaand pseudorapidity are derived based on these studies. The uncertainty is 2?5% for jets withtransverse momenta above 2 TeV, where this method provides the jet energy scale uncertaintyfor ATLAS.