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Open Access Publications from the University of California

Two Tests of New Physics Using Top Quarks at the CMS Experiment

  • Author(s): Klein, Daniel
  • Advisor(s): Wuerthwein, Frank
  • Yagil, Avraham
  • et al.

Two related analyses of data from the CMS Experiment are presented. The first is performed using 19.5 inverse femtobarns of proton-proton collision data from CMS Run I. In this analysis, six different asymmetry variables are measured in events with top-antitop quark pairs decaying to final states with two leptons. Unfolding techniques are used to extrapolate these measurements to parton level. No deviations from the predictions of the Standard Model are found, implying the absence of any influence from physics beyond the Standard Model. The second analysis is performed using 35.9 inverse femtobarns of proton-proton collision data collected during CMS Run II. In this analysis, a search is performed for evidence of stop squark pair production and decay to single-lepton final states. Several backgrounds, including dileptonic top-pair production, are estimated using control regions in the data. No excess above the Standard Model backgrounds is found, and exclusion limits are placed on three models of stop squark pair production.

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