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giuseppe |
1.1 |
\subsubsection{$\tau$ validation package}
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acosta |
1.3 |
In addition to the analysis exercises
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giuseppe |
1.1 |
described in the previous sections the $\tau$ reconstruction validation package has been run
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%% over pure di-$\tau$ samples (Z$\gamma \rightarrow \tau\tau \rightarrow 2\tau$-jets in the final state) and
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on skimmed $t\bar{t}$ events.
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%% (produced by the filter ``CSA06_HiggsTau_1lFilter'').
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acosta |
1.4 |
The skim filter, based on Monte Carlo ``truth,'' selects events with at least one electron or muon with a transverse
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giuseppe |
1.1 |
momentum of $p_{T}^{\rm e, \mu}>$15 GeV/$c$ with a selection efficiency of $\approx$47\%
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acosta |
1.4 |
A total of 2.15M $t\bar{t}$ events were produced with a total data size of $\approx$1.5TB (FEVT).
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acosta |
1.3 |
The RECOSIM output of the filter ($\approx$180 GB) was moved to
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acosta |
1.4 |
various Tier-2 centers in UK, Italy, Switzerland and Germany. The jobs, submitted through CRAB from CERN, have been run over ~250k events in Pisa Tier-2.
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giuseppe |
1.1 |
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The $\tau$ validation package, whose scope is to monitor
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the performance of the various $\tau$ tagging methods\cite{tauval_paper}, includes a number of standard histograms which
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be produced periodically for each release of CMSSW and during data taking. Some of the most relevant histograms are
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acosta |
1.4 |
the Efficiency vs Isolation Cone, Efficiency vs Jet transverse momentum, Efficiency to find the Leading Track, Number of Signal Tracks, $\Delta$R between the leading track and the jet.
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giuseppe |
1.1 |
As an example Fig.~\ref{fig:tauval_isoeff} shows the $\tau$ tagging efficiency versus the isolation cone (left) and versus the jet transverse energy (right). The various curves correspond to different selection of the primary vertex: for
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$t\bar{t}$ events without pileup, the various definitions are almost equivalent, as expected.
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\begin{figure}[htp]
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\begin{center}
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acosta |
1.2 |
\includegraphics[width=0.8\linewidth]{figs/tauval_c3}
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giuseppe |
1.1 |
\caption{$t\bar{t}$ events: $\tau$ tagging efficiency vs isolation cone (left); $\tau$ tagging efficiency vs jet transverse
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acosta |
1.3 |
energy (rigth). The various curves correspond to different selection of the primary vertex.}
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giuseppe |
1.1 |
\end{center}
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\label{fig:tauval_isoeff}
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\end{figure}
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