Doctor of Philosophy Oral Defense: Kenneth Call

DateJuly 8, 2019
Time3:00 - 4:30 pm
LocationBaylor Sciences Building, Room A.202
Description
Doctor of Philosophy Oral Defense



Kenneth Call

Advisor: Kenichi Hatakeyama



Search for Supersymmetric Partners of the Top Quark with the CMS Detector and Novel Top Quark Tagging Algorithms



The standard model of particle physics has been highly successful in explaining the observed
interactions of subatomic particles. The model was largely vindicated with the announced
observation of the Higgs boson by the ATLAS and CMS experiments at the LHC. The astronomical
observation of Dark Matter, among other reasons, motivates us to look for particles not part of
the standard model. One extension of the model posits an additional symmetry which pairs every
particle with a supersymmetric partner. Using data collected with the CMS detector at a center
of mass energy of 13 TeV during 2016, we have looked for evidence that the superpartner of the
top quark was generated then decayed into an undetected particle and a top quark that decayed
to hadronic jets. No statistically significant deviation from standard model expectations is
observed. Limits are placed on the production cross section in the context of a simplified
supersymmetric model. A feature of this search was a combination of algorithms that identify
top quarks. An improved top quark tagging algorithm with enhanced sensitivity to top quarks
that decay into three hadronic jets is presented.

PublisherDepartment of Physics
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