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

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dc.contributor.author Pearce, James D.
dc.date.accessioned 2011-12-12T16:51:31Z
dc.date.available 2011-12-12T16:51:31Z
dc.date.copyright 2011 en_US
dc.date.issued 2011-12-12
dc.identifier.uri http://hdl.handle.net/1828/3713
dc.description.abstract One 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.language English eng
dc.language.iso en en_US
dc.subject W boson en_US
dc.subject Z boson en_US
dc.subject leptoquark en_US
dc.subject jet en_US
dc.subject neural network en_US
dc.subject new physics search en_US
dc.subject W/Z + jets cross section en_US
dc.subject event shape variables en_US
dc.subject ATLAS en_US
dc.subject LHC en_US
dc.title W/Z+Jets production cross section ratio as a new physics search with the ATLAS Detector at CERN en_US
dc.type Thesis en_US
dc.contributor.supervisor Kowalewski, Robert V.
dc.degree.department Dept. of Physics and Astronomy en_US
dc.degree.level Master of Science M.Sc. en_US
dc.rights.temp Available to the World Wide Web en_US
dc.description.scholarlevel Graduate en_US


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