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dc.contributor.authorGoddard, Jack Robert
dc.date.accessioned2015-08-11T12:28:14Z
dc.date.available2015-08-11T12:28:14Z
dc.date.issued2014-04-18
dc.identifier.citationGoddard, J.R. 2014. A Measurement of the Low Mass Drell-Yan Di fferential Cross Section in the Di-Muon Channel with º s = 7 TeV Proton-Proton Collisions at the ATLAS Experiment.en_US
dc.identifier.urihttp://qmro.qmul.ac.uk/xmlui/handle/123456789/8147
dc.descriptionPhDen_US
dc.description.abstractA measurement of the Drell-Yan di fferential cross section at low invariant mass is presented in the di-muon channel. A 1.64 pb−1 dataset of º s = 7 TeV proton-proton collision data collected by the ATLAS experiment at the LHC is used. The measurement is made in an invariant mass range of 26 < M < 66 GeV where M is the invariant mass of the muon pair. A review of the relevant theoretical physics and the ATLAS detector is made. The analysis is described with particular attention paid to the determination of the isolation e fficiency corrections for the Monte Carlo and the estimate of the multijet background. The fiducial diff erential cross section is calculated with a statistical uncertainty that varies between 0.8% and 1.2%. The systematic uncertainty is seen to vary between 2.4% and 4.1%. A cross section extrapolated to the full phase space is also presented. This is dominated by theoretical uncertainties from the variation of the factorisation and renormalisation scales. The obtained fi ducial diff erential mass cross section is compared to theoretical predictions at NLO and NNLO in perturbative QCD. It is shown that a move beyond NLO is needed to describe the distribution well due to the restrictions of using a fixed order theoretical prediction. A combination with the electron channel measurement is also briefly discussed as well as comparisons to a di-muon measurement in an extended invariant mass range. This allows similar, but stronger conclusions to be drawn. A discussion is made of a PDF fit that uses the measurement presented here. The fi t demonstrates the impact of the measurement on the PDFs and further supports the conclusion that a move to NNLO in pQCD is needed to describe the data.en_US
dc.description.sponsorshipSTFCen_US
dc.language.isoenen_US
dc.publisherA Measurement of the Low Mass Drell-Yan Di fferential Cross Section in the Di-Muon Channel with º s = 7 TeV Proton-Proton Collisions at the ATLAS Experimenten_US
dc.subjectDrell-Yan measurementen_US
dc.subjectLarge Hadron Collideren_US
dc.subjectATLAS experimenten_US
dc.titleA Measurement of the Low Mass Drell-Yan Di fferential Cross Section in the Di-Muon Channel with º s = 7 TeV Proton-Proton Collisions at the ATLAS Experimenten_US
dc.typeThesisen_US


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