Measurement of the top quark pair production cross section with a tau lepton in the final state at the center of mass energy of 8 TeV

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dc.contributor.advisorGutierrez, Phillip
dc.contributor.authorHasib, Ahmed
dc.contributor.committeeMemberKantowski, Ronald
dc.contributor.committeeMemberHawthorne, James
dc.contributor.committeeMemberAbbott, Braden
dc.contributor.committeeMemberKao, Chung
dc.date.accessioned2016-07-18T13:41:37Z
dc.date.available2016-07-18T13:41:37Z
dc.date.issued2016
dc.date.manuscript2016-07
dc.description.abstractThis dissertation presents the measurement of the inclusive cross section of the top quark pair production in the final state of a tau lepton with associated jets. The dataset used in this measurement is collected by the ATLAS detector from proton-proton collisions during the 2012 operation of the Large Hadron Collider at the center-of-mass energy, $\sqrt{s} =$ 8~\tev. This dataset corresponds to an integrated luminosity of 20.2~\ifb. The inclusive \ttbar production cross section, $\sigma_{\ttbar}$ is found to be $\sigma_{\ttbar} = 231 \pm 3 {\rm (stat.)}^{+25}_{-25} {\rm (syst.)}\pm 3{\rm (lumi.)}~{\rm pb}$ for a top quark mass of 172.5~\gev. This result is consistent with the theoretical prediction $\sigma^{\mathrm{SM}}_{\ttbar} = 253^{+13}_{-15}~{\rm pb}$. Statistical analysis is performed to set a model independent upper limit on the visible cross section of any non Standard Model processes following frequentist probability. An upper limit on the branching ratio of the flavor changing neutral Higgs decay of the top quark to a charm quark is also calculated. The observed (expected) limit on the branching ratio at 95\% CL is $\text{BR}(t \rightarrow ch^0) <$ 10\% (15\%).en_US
dc.identifier.urihttp://hdl.handle.net/11244/44059
dc.languageen_USen_US
dc.subjecttop quarken_US
dc.subjectproduction cross sectionen_US
dc.subjectLHCen_US
dc.subjectATLASen_US
dc.thesis.degreePh.D.en_US
dc.titleMeasurement of the top quark pair production cross section with a tau lepton in the final state at the center of mass energy of 8 TeVen_US
ou.groupCollege of Arts and Sciences::Homer L. Dodge Department of Physics and Astronomyen_US

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