Changeset 119 in svn for trunk/paper/notes.tex
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- Jan 1, 2009, 9:49:36 PM (16 years ago)
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r118 r119 2 2 %\usepackage[english]{babel} 3 3 \usepackage[ansinew]{inputenc} 4 %\usepackage{abstract} 4 5 5 6 \usepackage{amsmath} … … 256 257 257 258 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. 258 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.259 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. 259 260 260 261 \textcolor{red}{More on jet algorithms?} … … 266 267 \subsection{$b$-tagging} 267 268 268 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. 269 270 \subsection{Tau identification} 269 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.} 270 %(Fig.~\ref{fig:btag}) 271 . 272 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 $0.7$. 273 274 %\begin{figure}[!h] 275 %\begin{center} 276 %\includegraphics[width=0.6\columnwidth]{btag} 277 %\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).} 278 %\label{fig:btag} 279 %\end{center} 280 %\end{figure} 281 282 283 \subsection{$\tau$ identification} 284 285 Jets originating from $\tau$-decays are identified using an identification procedure consistent with the one applied in a full detector simulation~\cite{bib:cmstaus}. 286 271 287 272 288 \begin{wrapfigure}{l}{0.3\columnwidth} … … 276 292 \end{wrapfigure} 277 293 278 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.294 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. 279 295 280 296 \subsubsection*{Electromagnetic collimation} … … 361 377 me@mylaptop:~$ tar -xvf Delphes_V_*.*. tar 362 378 me@mylaptop:~$ cd Delphes_V_*.* 363 me@mylaptop:~$ ./genMakefile.tcl > ;Makefile379 me@mylaptop:~$ ./genMakefile.tcl > Makefile 364 380 me@mylaptop:~$ make 365 381 \end{verbatim} … … 450 466 \bibitem{bib:CMSresolution} CMS IN 2007/053 451 467 \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} 468 \bibitem{bib:cmstaus} Tau reconstruction in CMS 452 469 \end{thebibliography} 453 470 454 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 !455 456 471 In the list of input files, all files should have the same type 457 472 458 Attention : in SmearUtil::RESOLution::BJets, the maximal energy was looked in 459 CONERADIUS/2 instead of CONERADIUS. This bug has been removed. 460 461 Attention : for the tau-jet identification : CONERADIUS /2 was used instead of 462 CONERADIUS ! 463 464 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 473 in other words, the effect related to the particle showers that would happen in the calorimeters are not taken into account. 465 474 466 475 \end{document}
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