Savanah Thais headshot

Savanah Thais

Ph.D. 2019
Physics

Current Position: Assistant Professor

Current Institution: Hunter College

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Advisor: Sarah Demers

Degree Year: 2019

Dissertation Title: Utilizing Electrons in the Search for Associated Higgs Production with the ATLAS Detector: Higgs decaying to a tau pair and vector boson decaying leptonically

Dissertation Abstract: The Higgs boson was discovered by the ATLAS and CMS collaborations in 2012 using data from $\sqrt{s}$=8TeV proton-proton collisions at the LHC. Since the initial discovery of the $H\rightarrow 4l$ and $H\rightarrow \gamma\gamma$ decays, multiple other Higgs analyses of production modes and decay channels have reached discovery significance. This thesis describes the search for the still unobserved vector boson ($V=W^{\pm},Z$) associated Higgs production with the Higgs decaying to a tau lepton pair using 46.9 fb$^{-1}$ of $\sqrt{s}$=13 TeV proton-proton collision data collected by the ATLAS detector in 2017. This analysis requires the vector boson to decay leptonically in order to reduce background contributions from hadronic activity in the detector and this thesis focuses primarily on the usage of final state electrons in the analysis.\

The primary background in all analysis categories are misidentified (or `faked’) objects; these contributions are estimated using a data-driven technique which relies on Machine Learning (ML) for object identification and reconstruction. ML is used broadly in High Energy Physics analyses and this work is introduced, with a focus on techniques for improving electron identification through image processing.

Information updated 03/17/2026

Experiments

ATLAS

Baker, Demers, Tipton

Science Goal: Precision tests of the standard model and new physics searches; including characterizing the Higgs Boson and using it to probe for new physics.

WL Involvement: The Yale team has critical responsibilities in the ATLAS collaboration for data quality and detector upgrades. Wright Lab has been the host of R&D and now construction of critical elements of the ATLAS tracker upgrade for the hI-LHC era.

Inside of ATLAS detector.

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