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root/cvsroot/UserCode/MitHzz4l/Documentation/Introduction.tex
Revision: 1.2
Committed: Tue Nov 8 11:18:58 2011 UTC (13 years, 6 months ago) by khahn
Content type: application/x-tex
Branch: MAIN
Changes since 1.1: +8 -8 lines
Log Message:
stuff corresponding to rough draft

File Contents

# User Rev Content
1 khahn 1.1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2     \section{Introduction}\label{section:Intro}
3     %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
4 khahn 1.2 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 :
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6     \begin{itemize}
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8 khahn 1.1 \item {\bf MVA Electron Identification :} Electrons are identified using a Boosted Decision Tree discriminant trained on samples of candidates from data.
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10 khahn 1.2 \item {\bf Angular Discrimination :} We include angular information in the signal extraction fit via an MVA discriminant.
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12 khahn 1.1 \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.
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14 khahn 1.2 \item {\bf Isolation :} We apply PF isolation criteria on individual leptons.
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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.
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18     \end{itemize}
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20 khahn 1.2 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}).
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