The jet energy scale at atlas using Z+jet events

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Thesis type
(Thesis) M.Sc.
Date created
Jets, collimated sprays of subatomic particles, are an important component of the final state in high- energy proton-proton scattering. A correct jet energy scale is therefore essential to the success of the ATLAS experiment. In this thesis the missing transverse projection fraction method is used to measure the absolute jet response in Z+jet events where the Z decays into a pair of leptons. This measurement complements similar measurements made using γ+jet events while extending the calibration to lower energies. The possibility of taking advantage of the differing fraction of events in each sample with gluon-initiated jets as a method for deriving a parton-dependent jet response is also explored. Preliminary results are shown to agree with Monte Carlo predictions within their statistical uncertainty.
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Supervisor or Senior Supervisor
Thesis advisor: Vetterli, Michel
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