| 1 |
giuseppe |
1.1 |
\subsubsection{$\tau$ validation package}
|
| 2 |
|
|
|
| 3 |
|
|
In addition to the analysis excercises
|
| 4 |
|
|
described in the previous sections the $\tau$ reconstruction validation package has been run
|
| 5 |
|
|
%% over pure di-$\tau$ samples (Z$\gamma \rightarrow \tau\tau \rightarrow 2\tau$-jets in the final state) and
|
| 6 |
|
|
on skimmed $t\bar{t}$ events.
|
| 7 |
|
|
|
| 8 |
|
|
%% (produced by the filter ``CSA06_HiggsTau_1lFilter'').
|
| 9 |
|
|
The skim filter, based on Monte Carlo truth, selected events with at least one electron or muon with a transverse
|
| 10 |
|
|
momentum of $p_{T}^{\rm e, \mu}>$15 GeV/$c$ with a selection efficiency of $\approx$47\%
|
| 11 |
|
|
|
| 12 |
|
|
A total of 2.15M of $t\bar{t}$ events were produced with a total data size of $\approx$1.5TB (FEVT).
|
| 13 |
|
|
The RECOSIM output of the filter ($\approx$180 GB) was moved to various T2 centers in UK, Italy, Switzerland and Germany.The jobs, submitted through CRAB from CERN, have been run over ~250k events in Pisa tier2.
|
| 14 |
|
|
|
| 15 |
|
|
The $\tau$ validation package, whose scope is to monitor
|
| 16 |
|
|
the performance of the various $\tau$ tagging methods\cite{tauval_paper}, includes a number of standard histograms which
|
| 17 |
|
|
be produced periodically for each release of CMSSW and during data taking. Some of the most relevant histograms are
|
| 18 |
|
|
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.
|
| 19 |
|
|
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
|
| 20 |
|
|
$t\bar{t}$ events without pileup, the various definitions are almost equivalent, as expected.
|
| 21 |
|
|
|
| 22 |
|
|
\begin{figure}[htp]
|
| 23 |
|
|
\begin{center}
|
| 24 |
acosta |
1.2 |
\includegraphics[width=0.8\linewidth]{figs/tauval_c3}
|
| 25 |
giuseppe |
1.1 |
\caption{$t\bar{t}$ events: $\tau$ tagging efficiency vs isolation cone (left); $\tau$ tagging efficiency vs jet transverse
|
| 26 |
|
|
energy (rigth). The various curves correespond to different selection of the primary vertex.}
|
| 27 |
|
|
\end{center}
|
| 28 |
|
|
\label{fig:tauval_isoeff}
|
| 29 |
|
|
\end{figure}
|
| 30 |
|
|
|
