W/Z+Jets production cross section ratio as a new physics search with the ATLAS Detector at CERN

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dc.contributor.authorPearce, James D.
dc.contributor.supervisorKowalewski, Robert V.
dc.date.accessioned2011-12-12T16:51:31Z
dc.date.available2011-12-12T16:51:31Z
dc.date.copyright2011en_US
dc.date.issued2011-12-12
dc.degree.departmentDept. of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractOne of the dominant backgrounds in new physics searches at the Large Hadron Collider comes from the leptonic decays of Standard Model W and Z bosons recoiling off jets associated with the underlying event. The ratio of the W+jets and Z+jets cross sections, Rn, is predicted with high precision due to the similar masses and production mechanisms of the W and Z bosons. Any significant departures of Rn from predicted values would be an indication of new physics. This thesis studies a strategy to enhance the sensitivity of Rn to a specific type of signal. A measurement of the ratio Rn is presented, and its sensitivity to pair production of top quarks and leptoquarks is studied. Using a set of topology-discriminating variables, based upon calorimeter topoclusters, the sensitivity of Rn to top quark and leptoquark signals is enhanced using multivariate analysis techniques.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/3713
dc.languageEnglisheng
dc.language.isoenen_US
dc.rights.tempAvailable to the World Wide Weben_US
dc.subjectW bosonen_US
dc.subjectZ bosonen_US
dc.subjectleptoquarken_US
dc.subjectjeten_US
dc.subjectneural networken_US
dc.subjectnew physics searchen_US
dc.subjectW/Z + jets cross sectionen_US
dc.subjectevent shape variablesen_US
dc.subjectATLASen_US
dc.subjectLHCen_US
dc.titleW/Z+Jets production cross section ratio as a new physics search with the ATLAS Detector at CERNen_US
dc.typeThesisen_US

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