| 1 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
| 2 |
\section{Introduction}\label{section:Intro}
|
| 3 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
| 4 |
This note describes an independent search for $H \rightarrow ZZ$ decays in the 4-lepton channel with $2.1~\rm{fb^{-1}}$. The primary differences between this analysis and the current baseline~\cite{baseline} are :
|
| 5 |
|
| 6 |
\begin{itemize}
|
| 7 |
|
| 8 |
\item {\bf MVA Electron Identification :} Electrons are identified using a Boosted Decision Tree discriminant trained on samples of candidates from data.
|
| 9 |
|
| 10 |
\item {\bf Angular Discrimination :} We include angular information in the signal extraction fit via an MVA discriminant.
|
| 11 |
|
| 12 |
\item {\bf Variable Electron Identification Working Points :} Electron candidates that form the on-shell Z in the 4 lepton system are selected with a looser set of ID requirements relative to those forming the off-shell Z.
|
| 13 |
|
| 14 |
\item {\bf Isolation :} We apply PF isolation criteria on individual leptons.
|
| 15 |
|
| 16 |
\item {\bf Treatment of Fake/Instrumental Backgrounds :} Light and heavy flavor backgrounds are estimated together using the ``fakeable object'' technique. We investigate the performance of this method in several control regions and take observed biases as systematic uncertainties on our central estimates.
|
| 17 |
|
| 18 |
\end{itemize}
|
| 19 |
|
| 20 |
These changes result in the selection of {\bf $+X/-Y$ } events with respect to the baseline. We discuss these events in detail in Section~\ref{sec:Results}. The limits we extract are comparable to those of~\cite{baseline} for below $\sim 200~\rm{GeV}$, but improve for higher masses ({\bf Verify}).
|
| 21 |
|
| 22 |
|
| 23 |
|
