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Electroweak physics and evidence for a Higgs boson decaying to a pair of tau leptons with the CMS detector

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dc.contributor.advisor Markus Klute. en_US
dc.contributor.author Apyan, Aram en_US
dc.contributor.other Massachusetts Institute of Technology. Department of Physics. en_US
dc.date.accessioned 2017-10-30T15:30:41Z
dc.date.available 2017-10-30T15:30:41Z
dc.date.copyright 2017 en_US
dc.date.issued 2017 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/112081
dc.description Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2017. en_US
dc.description Cataloged from PDF version of thesis. en_US
dc.description Includes bibliographical references (pages 157-170). en_US
dc.description.abstract .Studies of the electroweak interactions using final states with leptons in proton-proton collisions at the Large Hadron Collider at [square root of] s = 7 TeV, [square root of] s = 8 TeV, and [square root of] s = 13 TeV center-of-mass energies are described. Measurements of total inclusive and fiducial W and Z boson production cross sections and their ratios are performed. The W and Z bosons are observed via their decays to electrons and muons. An indirect determination of the total width of the W boson and the B(W --> lv) from the measured cross section ratios is described. The discovery of a new boson with a mass of 125 GeV at the Large Hadron Collider in 2012 sheds a new light on understanding the nature of electroweak symmetry breaking. A question of great significance is whether the new field couples to fermions through a Yukawa coupling interaction predicted in the standard model of particles. Evidence of the 125 GeV Higgs boson decay to a pair of tau leptons with an observed significance of 3.1 standard deviations is established. The nature of the Higgs sector is probed through searches for neutral resonances decaying to a pair of tau leptons in gluon-fusion and b-quark associated production modes with no observation of a significant excess. In addition, the feasibility of measuring the standard model Higgs boson self-coupling with an expected data sample corresponding to an integrated luminosity of 3000 fb-1 is studied. en_US
dc.description.statementofresponsibility by Aram Apyan. en_US
dc.format.extent 170 pages en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582 en_US
dc.subject Physics. en_US
dc.title Electroweak physics and evidence for a Higgs boson decaying to a pair of tau leptons with the CMS detector en_US
dc.type Thesis en_US
dc.description.degree Ph. D. en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Physics. en_US
dc.identifier.oclc 1006756029 en_US


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