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dc.contributor.authorCaputo, Regina Marieen_US
dc.contributor.otherDepartment of Physicsen_US
dc.date.accessioned2012-05-17T12:20:06Z
dc.date.available2012-05-17T12:20:06Z
dc.date.issued1-Aug-11en_US
dc.date.submittedAug-11en_US
dc.identifierCaputo_grad.sunysb_0771E_10661.pdfen_US
dc.identifier.urihttp://hdl.handle.net/1951/55967
dc.description.abstractSimilarities between quarks and leptons, which are elementary particles, suggest an additional symmetry or communication between the two families. Leptoquarks are hypothetical particles that carry both lepton and baryon number and would represent this additional symmetry. They are proposed to exist in several extensions to the Standard Model such as Grand Unification Theories (GUTs) and technicolor models. This work reports on the search for first generation scalar leptoquarks at the ATLAS detector using an integrated luminosity of 35 pb<super>-1</super> collected during the 2010 LHC running. Leptoquarks are produced in pairs and each leptoquark decays into a lepton/quark pair. One resulting event topology is two high energy jets, one high energy electron and missing transverse energy arising from a neutrino. The background, predominantly from associated production of vector bosons with jets and top quarks, is estimated using Standard Model simulated data, normalized and checked against observations in control regions. Multijet (QCD) background is estimated using data driven methods, primarily the Matrix Method for shape determination and the Fitting Method for normalization. The number of events observed is in good agreement with background predictions. First generation leptoquarks with a mass less than 319 GeV at excluded at a 95% CL for the branching fraction, &#914;, of a leptoquark to an electron and quark of 0.5. Weaker limits are derrived for other branching fraction values.en_US
dc.description.sponsorshipStony Brook University Libraries. SBU Graduate School in Department of Physics. Lawrence Martin (Dean of Graduate School).en_US
dc.formatElectronic Resourceen_US
dc.language.isoen_USen_US
dc.publisherThe Graduate School, Stony Brook University: Stony Brook, NY.en_US
dc.subject.lcshPhysicsen_US
dc.subject.otherATLAS, Leptoquarks, LHCen_US
dc.titleA Search for First Generation Leptoquarks at the ATLAS detectoren_US
dc.typeDissertationen_US
dc.description.advisorAdvisor(s): John D. Hobbs. Maria Victoria Fernandez-Serra. Committee Member(s): Patrick Meade; Hong Ma.en_US
dc.mimetypeApplication/PDFen_US


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