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root/cvsroot/UserCode/MitHzz4l/Documentation/Introduction.tex
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Committed: Sun Nov 6 16:00:05 2011 UTC (13 years, 6 months ago) by khahn
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2 \section{Introduction}\label{section:Intro}
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4 This note describes an independent search for $H \rightarrow ZZ$ decays in the 4-lepton channel. Currently the analysis is performed in the context of the $1.6~\rm{fb^{-1}}$ LP dataset. We consider two kinematic scenarios, consistent with the direction of the baseline $4\ell$ analysis~\cite{ref:baseline}. The primary differences in this analysis with respect to the current baseline are :
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6 \begin{itemize}
7 \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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9 \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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11 \item {\bf Anuglar Discrimination :} We include angular information in the signal extraction fit via an MVA discrminant.
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13 \end{itemize}
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16 Pay particular attention to jet backgrounds, which are difficult to estimate and can be sneaky.
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18 Our analyses differ on several addtional points ({\it e.g.: } application of lepton isolation, fake and heavy flavor background estimation, {\it etc} ), which we explain in the text that follows. Some aspects of the analysis are not yet complete. The text describes our strategy for these missing pieces.
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20 Overall, our changes to event seleation result in {\bf +9/-4 } events in the loose-kinematics signal region. We discusse these events in detail in Section~\ref{section:Results}. The limits we extract are comparable to those of~\cite{ref:baseline} for Higgs masses below $\sim 200~\rm{GeV}$, but improve for higher masses ({\bf Verify}).
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