thesis.tex

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\begin{document}

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\title{Searches for Electroweak Production of Compressed Supersymmetry in Events with Soft Leptons, Missing Transverse Momentum, and a Hard Jet in the ATLAS Detector}
\author{Sheena Calie Schier}
\degreeyear{2018}
\degreemonth{June}
\degree{DOCTOR OF PHILOSOPHY}
\chair{Professor Abraham Seiden}
\committeememberone{Professor Jason Nielsen}
\committeemembertwo{Professor Michael Hance}
\numberofmembers{3} 
\deanlineone{Dean Tyrus Miller}
\deanlinetwo{Vice Provost and Dean of Graduate Studies}
\deanlinethree{}
\field{Physics}
\campus{Santa Cruz}
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\begin{abstract}
Supersymmetry (SUSY) is an extension of the Standard Model that predicts a boson (fermion) partner for each fermion (boson) in the Standard Model. Weak-scale SUSY is attractive for reasons like improving gauge coupling unification, reducing fine-tuning in the Higgs sector and providing a dark matter candidate. This thesis presents a dedicated search for direct production of new, colorless, weak-scale states with compressed mass spectra in final states characterized by soft visible decay products. This analysis uses $pp$ collisions at $\sqrt s$ = 13 TeV at the Large Hadron Collider and collected by the ATLAS experiment during 2015 and 2016 corresponding to 36.1 $\mathrm{fb}^{-1}$ of integrated luminosity. This analysis selects events with two soft electrons or muons, an intermediate amount of missing transverse momentum (\met{}), and a hard jet. Backgrounds with two prompt leptons are estimated with Monte Carlo simulation, while reducible backgrounds are estimated with a mix of Monte Carlo and data-driven methods. Results are consistent with Standard Model expectations and used to put limits on compressed supersymmetric states.  Limits are extended on compressed electroweak SUSY model for the first time since the Large Electron Positron Collider (LEP).

\end{abstract}

\begin{dedication}
\null\vfil
{\large
\begin{center}
To my father,\\\vspace{12pt}
Lecil Charles Schier,\\\vspace{12pt}
the person who taught me at the age of 7 that the grass in not green.
\end{center}}
\vfil\null
\end{dedication}


\begin{acknowledgements}
I want to thank everyone..
\end{acknowledgements}

\end{frontmatter}
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\part{Theoretical Motivation and Experimental Setup}
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\part{Analysis and Results}
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