Changeset 119 in svn for trunk/paper/notes.tex

Timestamp:

Jan 1, 2009, 9:49:36 PM (16 years ago)

Author:

Xavier Rouby

Message:

update 23h01

File:

• trunk/paper/notes.tex (modified) (6 diffs)

trunk/paper/notes.tex

@@ -2 +2 @@
 %\usepackage[english]{babel}
 \usepackage[ansinew]{inputenc}
+%\usepackage{abstract}
 
 \usepackage{amsmath}
@@ -256 +257 @@
 
 Final state particles which hadronise or invisible ones are more difficult to measure. For instance, light jets or jets originating from $b$ quarks or $\tau$ leptons require dedicated algorithms for their measurement.
-The \textsc{FastJet} tools have been integrated into the \textsc{Delphes} framework for a fast jet reconstruction, using several algorithms, like Cone or $k_T$ ones. 
+The \textsc{FastJet} tools~\cite{bib:FastJet} have been integrated into the \textsc{Delphes} framework for a fast jet reconstruction, using several algorithms, like Cone or $k_T$ ones. 
 
 \textcolor{red}{More on jet algorithms?}
@@ -266 +267 @@
 \subsection{$b$-tagging}
 
-A jet is tagged as $b$-jets if its direction lies in the acceptance of the tracker and if it is associated to a parent $b$-quark. A $b$-tagging efficiency of $40\%$ is assumed if the jet has a parent $b$ quark. For $c$-jets and light/gluon jets, a fake $b$-tagging efficiency of $10 \%$ and $1 \%$ respectively is assumed\footnote{Corresponding tot the TAGGING\_B, MISTAGGING\_C and MISTAGGING\_L constants, for (respectively) the efficiency of tagging of a $b$-jet, the efficiency of mistagging a c-jet as a $b$-jet, and the efficiency of mistatting a light jet (u,d,s,g) as a $b$-jet.}. The (mis)tagging relies on the particle ID of the most energetic particle within a cone around the observed (eta,phi) region, with a radius CONERADIUS.
-
-\subsection{Tau identification}
+A jet is tagged as $b$-jets if its direction lies in the acceptance of the tracker and if it is associated to a parent $b$-quark. A $b$-tagging efficiency of $40\%$ is assumed if the jet has a parent $b$ quark. For $c$-jets and light/gluon jets, a fake $b$-tagging efficiency of $10 \%$ and $1 \%$ respectively is assumed\footnote{\texttt{[code] }Corresponding to the \texttt{TAGGING\_B}, \texttt{MISTAGGING\_C} and \texttt{MISTAGGING\_L} constants, for (respectively) the efficiency of tagging of a $b$-jet, the efficiency of mistagging a c-jet as a $b$-jet, and the efficiency of mistatting a light jet (u,d,s,g) as a $b$-jet.} 
+%(Fig.~\ref{fig:btag})
+. 
+The (mis)tagging relies on the true particle \textsc{id} of the most energetic particle within a cone around the observed $(\eta,\phi)$ region, with a radius $R = \sqrt{\Delta \eta^2 + \Delta \phi^2}$ of $0.7$.
+
+%\begin{figure}[!h]
+%\begin{center}
+%\includegraphics[width=0.6\columnwidth]{btag}
+%\caption{Default efficiency of $b$-tag for jets coming from $b$ quarks, $c$ quarks and from other particles (jets from gluons or $u$, $d$ and $s$ quarks).}
+%\label{fig:btag}
+%\end{center}
+%\end{figure}
+
+
+\subsection{$\tau$ identification}
+
+Jets originating from $\tau$-decays are identified using an identification procedure consistent with the one applied in a full detector simulation~\cite{bib:cmstaus}. 
+
 
 \begin{wrapfigure}{l}{0.3\columnwidth}
@@ -276 +292 @@
 \end{wrapfigure}
 
-Jets originating from $\tau$-decay are identified using an identification procedure consistent with the one applied in a full detector simulation. The tagging rely on two properties of the $\tau$ lepton. First, in roughly $75 \%$ of the time, the hadronic $\tau$-decay products contain only one charged hadron and a number of $\pi^0$. Second, the particles arisen from the $\tau$-lepton produce narrow jets in the calorimeter. 
+The tagging rely on two properties of the $\tau$ lepton. First, in roughly $75 \%$ of the time, the hadronic $\tau$-decay products contain only one charged hadron and a number of $\pi^0$. Secondly, the particles arisen from the $\tau$-lepton produce narrow jets in the calorimeter. 
 
 \subsubsection*{Electromagnetic collimation}
@@ -361 +377 @@
 me@mylaptop:~$ tar -xvf Delphes_V_*.*. tar  
 me@mylaptop:~$ cd Delphes_V_*.* 
-me@mylaptop:~$ ./genMakefile.tcl >; Makefile 
+me@mylaptop:~$ ./genMakefile.tcl > Makefile 
 me@mylaptop:~$ make 
 \end{verbatim}
@@ -450 +466 @@
 \bibitem{bib:CMSresolution} CMS IN 2007/053
 \bibitem{bib:root} \textsc{Root} - An Object Oriented Data Analysis Framework, R. Brun and F. Rademakers, Nucl. Inst. \& Meth. in Phys. Res. A 389 (1997) 81-86, \url{http://root.cern.ch} 
+\bibitem{bib:cmstaus} Tau reconstruction in CMS
 \end{thebibliography}
 
-Attention : in SmearUtil::NumTracks, the function arguments 'Eta' and 'Phi' have been switched. Previously, 'Phi' was before 'Eta', now 'Eta' comes in front. This is for consistency with the other functions in SmearUtil. Check your routines, when using NumTracks !
-
 In the list of input files, all files should have the same type 
 
-Attention : in SmearUtil::RESOLution::BJets, the maximal energy was looked in
-CONERADIUS/2 instead of CONERADIUS. This bug has been removed.
-
-Attention : for the tau-jet identification : CONERADIUS /2 was used instead of
-CONERADIUS !
-
- in other words, the effect related to the particle showers that would happen in the calorimeters are not taken into account. We took the hypothesis that stable particles interacting electromagneticaly deposit their energies in the ECAL calorimeter and that the hadrons just interact with the HCAL
+ in other words, the effect related to the particle showers that would happen in the calorimeters are not taken into account.
 
 \end{document}