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Title: Electron and hadronic recoil calibration for the first measurement of the mass of the W boson by the ATLAS experiment at the Large Hadron Collider
Author: Davies, Eleanor Lucy
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2014
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This thesis presents work towards the first measurement of the mass of the W boson (mW) at ATLAS at the Large Hadron Collider using √s = 7 TeV collision data taken in 2011. The electron energy calibration is presented, including a detailed study of the linearity of the ATLAS electromagnetic calorimeter. Separately, the measurement of the W boson recoil is calibrated using Z boson events. Recoil corrections for the underlying event, pileup, recoil magnitude resolution, recoil angular resolution and recoil response mismodelling are determined, with statistical uncertainties on these corrections corresponding to an estimated uncertainty on mW of 3.9 MeV. The corrections for calorimeter non-linearity and recoil modelling improve the description of the data, though systematic biases remain. To achieve a precision commensurate with the statistics of the data, these biases will need to be understood.
Supervisor: Hays, Christopher; Haywood, Stephen Sponsor: Science & Technology Facilities Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Particle physics ; Large Hadron Collider