\documentclass[12pt]{article}
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\def\text_style{\color{green}\small}
\def\mark_style{\color{red}\normalsize}
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%--- COMMANDS ---
\newcommand{\tab}{\hspace*{0.5in}}
\newcommand{\Up}{\vspace*{-1.0in}}
\newcommand{\up}{\vspace*{-1.0cm}}
%
\def\ul#1{$\underline{\hbox{#1}}$}
\def\rr{\hbox{\vrule height 3pt depth-2pt width.5cm}}
%
\newcommand{\sleq} {\raisebox{-.6ex}{${\textstyle\stackrel{<}{\sim}}$}}
\newcommand{\sgeq} {\raisebox{-.6ex}{${\textstyle\stackrel{>}{\sim}}$}}
\newcommand{\mxtwo}{\mbox{$M^2_x$}}
\newcommand{\Qtwo}{\mbox{$Q^2$}}
\newcommand{\etamax}{\mbox{$\eta_{\rm max}$}}
\newcommand{\betan}{\mbox{$\beta\;$}}
\newcommand {\pom}  {I\hspace{-0.2em}P}
\newcommand {\apom} {\mbox{$\alpha_{_{\pom}}$}}
\newcommand {\xpom} {\mbox{$x_{_{\pom}}$}}
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\newcommand {\xpoma} {\mbox{$(1/x_{_{\pom}})^a\;$}}
\newcommand{\shif} {\hspace*{1.5in}}
\newcommand{\sshif} {\hspace*{0.5cm}}
%--- Colors ---
\newcommand{\green}{\color{green}}
\newcommand{\violet}{\color{magenta}}
\definecolor{purple}{rgb}{0.8,0,0.3}
\newcommand{\purple}{\color{purple}}
\newcommand{\blue}{\color{blue}}
\newcommand{\red}{\color{red}}
\newcommand{\black}{\color{black}}
\definecolor{b2}{rgb}{0.2,0.2,1}
\definecolor{b4}{rgb}{0.4,0.4,1}
\definecolor{b6}{rgb}{0.6,0.6,1}
\definecolor{b8}{rgb}{0.8,0.8,1}
\def\Blue{\color{blue}}
\def\Red{\color{red}}
\def\Green{\color{green}}
%--- Definitions
\def\Do{\mbox{D\O}}
\def\pp{$p\bar{p}$}
\def\tt{$t\bar{t}$}
\def\bb{$b\bar{b}$}
\def\ptmu{$p_T^{\mu}$}
\def\pt{$p_T$}
\def\ptb{$p_T^b$}
\def\etamu{$\eta^{\mu}$}
\def\DTtof{\mbox{$\Delta T_{\mathrm{tof}}$}}
\def\ttmj{\mbox{$t\bar{t}\rightarrow \mu + jets$}}
\def\ttaj{\mbox{$t\bar{t}\rightarrow all\ jets$}}
\def\dsdptmu{\mbox{d$\sigma_b^{\mu}/\mathrm{d}p_T^{\mu}$}}
\def\dsdptb{\mbox{d$\sigma^b/\mathrm{d}p_T^b$}}
\def\bsdsphi{\mbox{$B_s \rightarrow D_s + \mu$}}
\def\bsds3pi{\mbox{$B_s \rightarrow D_s + 3\pi$}}
\def\bks{\mbox{$B \rightarrow K_s + J/\psi$}}
\def\dsphi{\mbox{$D_s + \mu$}}
\def\ds3pi{\mbox{$D_s + 3\pi$}}
\def\kspsi{\mbox{$K_s + J/\psi$}}
\def\effi{$\epsilon$}
\def\JNX#1#2{JET\_#1\_#2}
%
%--- Frederic's Definitions 
\def\Do{\mbox{D\O}}
\def\pp{$p\bar{p}$}
\def\ptmu{$p_T^{\mu}$}
\def\ptb{$p_T^b$}
\def\pt{$p_T$}
\def\etamu{$\eta^{\mu}$}
\def\DTtof{\mbox{$\Delta T_{\mathrm{tof}}$}}
\def\dsdptmu{\mbox{d$\sigma_b^{\mu}/\mathrm{d}p_T^{\mu}$}}
\def\dsdptb{\mbox{d$\sigma^b/\mathrm{d}p_T^b$}}
\def\bkspsi{\mbox{$B_d^{\circ} \rightarrow K_s^{\circ} + J/\psi$}}
\def\bsdsphi{\mbox{$B_s^{\circ} \rightarrow D_s^- + \mu^+ + \nu_{\mu}$}}
\def\bsds3pi{\mbox{$B_s^{\circ} \rightarrow D_s^- + 3\pi^{\pm}$}}
\def\bsdslX{\mbox{$B_s^{\circ} \rightarrow D_s^- + \ell^+ + X$}}
\def\bsdsnpi{\mbox{$B_s^{\circ} \rightarrow D_s^- + n\pi^{\pm}$}}
\def\bks{\mbox{$B_d^{\circ} \rightarrow K_s + J/\psi$}}
\def\bks2{\mbox{$B_d^{\circ} \rightarrow J/\psi \, K_s$}}
\def\dskkp{\mbox{$D_s^- \rightarrow K^+ K^- \pi^-$}}
\def\dsphi{\mbox{$D_s^- + \mu^+$}}
\def\dsmunu{\mbox{$D_s^-\, \mu^+\, \nu_{\mu}$}}
\def\ds3pi{\mbox{$D_s^- + 3\pi^{\pm}$}}
\def\kspsi{\mbox{$K_s + J/\psi$}}
\def\psiks{\mbox{$\psi\,K_s$}}
\def\QQmumu{\mbox{$Q\bar{Q}\rightarrow \mu \mu$}}
\def\QQmu{\mbox{$Q\bar{Q}\rightarrow \mu$}}
\def\QQee{\mbox{$Q\bar{Q}\rightarrow e e$}}
\def\bb{\mbox{$b\bar{b}$}}
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%


\def \imply {\ifmmode {\Rightarrow }\else {$\Rightarrow $}\fi}
%%%%%%%%%%%
\begin{document}
\parskip 2mm
\parindent 0mm
\pagestyle{empty}
%\normalsize\sffamily\color{magenta}
\normalsize\sffamily
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% PREAMBLE %%%%%%%%%%%%%%%%%%%%%%%%%%

%%%SLIDE%%%%

\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{Overview of Physics Benefits of STT}\\
{\Large \Blue STT review, 12 March 1998}\\
{\large \black Horst D. Wahl}\\
\vspace{4cm}
\Red{\underline{Outline }}
\end{center}
\Large
\begin{itemize}
 \item  {\Blue Gains from STTpp}
 \begin{itemize}
   \item better momentum resolution
   \item $E_T/p_T$ cut possible at L2
   \item determination of track impact parameter ($r\phi$) and its significance
  \end{itemize}
  \item  {\Blue Physics Benefits }
  \begin{itemize}
    \item $t$ ($t \bar t$, single top) 
    \item Associated Higgs production 
    \item $Z\to b \bar b$ events
    \item $b$-physics
  \end{itemize}
 \item  {\Blue $z$-vertex finding for use in L3 }
 \begin{itemize}
    \item sharper electron and jet turn-on curves
 \end{itemize}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Present RunII Trigger Scheme}}
\end{center}

\Large
\begin{itemize}
  \item {\Red Bandwidth Allocations:}
  \begin{itemize}
    \item \Blue {L1} in: 7MHz, out: 5-10kHz ; \Blue{time:} 4.2$\mu$s 
    \item \Blue{L2} in: 10kHz, out:  1kHz ; \Blue{time:} 100$\mu$s 
    \item \Blue{L3} in: 1kHz, out:   20Hz ; \Blue{time:} 100 ms/ 50 nodes
  \end{itemize}

  \item {\Red Current Configuration:}
  \begin{itemize}
    \item \Blue{L1: } Uses Calorimeter, Fiber tracker (CFT), 
    Muon  and Preshower objects.\\
     \imply trigger on 
    Cal $E_T$ ($em$ and jets),\\
     muon $p_T$ (use CFT), \\
    track $p_T$, \\
    track-preshower stubs
    \item \Blue{L2: } trigger combines L1 objects into electrons, muons, jets.
  \end{itemize}

  \item {\Red use of SMT information  in trigger:}
  \begin{itemize}
     \item Currently L1 and L2 track triggers {\Blue do not} make use of hits in the
    Silicon detector.
     \item Questionable if L3 will be able to use Silicon information for triggering,
    as cpu constraints may require starting from L2 object seeds!
   \end{itemize}
 \end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\purple{\underline{Possible Benefits of a Silicon Track Trigger}}
\end{center}
\Large
\vspace{1.0cm}
\begin{itemize}
\item[1.] {\Blue Add Silicon hits in track fit to improve momentum resolution}\\
    \imply sharper $p_t$ thresholds,\\
    \sshif  E/p for electrons at L2;
  \begin{itemize}
    \item {\Green Potentially benefits ANY trigger}
  \end{itemize}

\item[2.] {\Blue Trigger on high impact parameter tracks} \\
    \imply trigger on events containing $b$-quarks;
  \begin{itemize}
    \item {\Green Benefits specific physics channels otherwise difficult to 
trigger on $e.g.$ $b$-physics, $Z \to b \overline b$, Higgs$\to b \overline b$,
$t$-physics, $\ldots$}
  \end{itemize}


\item[3.] {\Blue Use Silicon detector (90$^\circ$ stereo) information for fast 
$z$-vertex position}\\
    \imply
        sharper electron and jets $p_T$ thresholds at L3,\\
    \sshif    beam tilt $\rightarrow$ need z for impact parameter determination;
  \begin{itemize}
    \item {\Green Benefits ANY trigger}
  \end{itemize}

\item[4.] {\Blue Hit Finder for Level3} \\
    \imply Save processing time in L3 by providing
    hits positions for $r/\phi$ and stereo (both 90$^\circ$ and 2$^\circ$,
    enabling efficient/possible use of Silicon information.

\end{itemize}
%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Tasks of the STT  (L2 preprocessor)}}
\end{center}

\Large
\begin{itemize}
\purple{
\item finds hit clusters in Silicon Detector
\item finds tracks in Silicon Detector (in roads from CFT)
\item determines track parameters ($\vec p$, impact parameter)
\item find $z$-vertex from 90$^\circ$  stereo hits
\item ships information to global L2 processor for decision
\item ships $z$-vertex and hit cluster to L3
}
\end{itemize}
               

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Performance Studies}}
\end{center}
\Large
\black
%\vspace{-0.25cm}
%{\centerline{(Dan Karmgard, Terry Heuring)}}
Use single track events, $\mu$ and $e$ ($|\eta| \sleq 1.0, 
1.5 \sleq p_T \sleq 15$ GeV)
%\vspace{0.1cm}
\vspace{-0.2cm}
\begin{center}
\color{blue} \LARGE\bfseries
$p_T$ resolution
\end{center}
\begin{itemize}
 \item CFT momentum computed two ways 
    \begin{itemize}
    \item[(a)] use fibers in inner and outer layer only (L2).
    \item[(b)] use $p_t^{min}$ and $p_t^{max}$, the momentum limits
               from CFT track eqn (L1)\\
                  \imply
    ${1\over p_t} = {1\over 2} ({1\over p_t^{min}} + {1\over p_t^{max}}) $
    \end{itemize}
 \end{itemize}
\vspace{-1.cm}
\centerline{ \psfig{figure=momentum.eps,height=10cm}}
\begin{itemize}
\item {\Green resolution using STT improves compared to CFT}
\begin{itemize}
\item for $p_T$ = 3 GeV \imply {\Blue 
${\sigma (STT)\over \sigma (CFT (a))} \approx 0.5$} \\
{\shif\sshif\sshif\sshif\Blue 
${\sigma (STT)\over \sigma (CFT (b))} \approx 0.8$}
\item for $p_T$ = 15 GeV \imply {\Red 
${\sigma (STT)\over \sigma (CFT (a))} \approx 0.3$} \\
{\Red\shif\sshif\sshif\sshif\sshif ${\sigma (STT)\over \sigma (CFT (b))} \approx 0.6$}
\end{itemize}
\end{itemize}


%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Using $E_T/p_T$ at L2}}
\end{center}
\Large
\vspace{-0.25cm}
%{\centerline{(Meenakshi Narain)}}
\Large
\vspace{1.0cm}
{\Blue Compare $E_T/p_T$ for tracks with and without SVX info.}\\
note : Use both types of CFT momentum calculation.\\

\centerline{\hspace{1cm}\psfig{figure=plot_e_over_p_5gev.eps,width=4.0in}
\hspace{-1cm}\psfig{figure=plot_e_over_p_20gev.eps,width=4.0in}}
%\begin{minipage}[b]{.46\linewidth}
%\hspace{-1in}\psfig{figure=plot_e_over_p_5gev.eps,width=4.0in}
%\end{minipage}\hfill
%\begin{minipage}[b]{.46\linewidth}
%\hspace{-1in}\psfig{figure=plot_e_over_p_20gev.eps,width=4.0in}
%\end{minipage}

\vspace{-1.0cm}
\begin{itemize}
\item {\Green $E_T/p_T$ resolution is better by a factor of 2 for high $p_T$ 
electrons.}
%\sshif {\normalsize\Red{(Note : currently not possible to use CFT $p_T$ (b) at L2) }}
\item Rejection and efficiency relative to the `standard isolated' electron
definition :
\end{itemize}

\vspace{-0.5cm}
\begin{center}
\begin{tabular}{|l||c|c||c|c|} \hline \hline
 & \multicolumn{2}{c|}{ $p_T(ele)$ = 20 GeV} &  
   \multicolumn{2}{c|}{ $p_T(ele)$ = 5 GeV}   \\
 $p_T$ type & Eff. (\%)  & Bkg Rej. & Eff. (\%)  & Bkg Rej. \\
\hline \hline
CFT  (a) &  {\Blue 90}  & {\Blue x3} &  {\Red  99}  & {\Red  x2} \\
STT+CFT &  {\Blue 87}  & {\Blue x5} &  {\Red  99}  & {\Red  x8} \\
 \hline \hline
\end{tabular}
\end{center}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Impact Parameter Resolution}}
\end{center}
\Large
\vspace{-0.25cm}
%{\centerline{(Dan Karmgard, Fr\'ed\'eric Stichelbaut)}}
\Large
\centerline{\psfig{figure=impact.eps,width=3.0in}}
%\psfig{figure=fs_svt_berr2.eps,width=3.5in}}
%\begin{minipage}[b]{.46\linewidth}
%\hspace{-3.0cm}\psfig{figure=impact.eps,width=3.5in}
%\end{minipage}\hfill
%\begin{minipage}[b]{.46\linewidth}
%\hspace{-3.0cm}\psfig{figure=fs_svt_berr2.eps,width=4.5in}
%\end{minipage}

\begin{itemize}
\item {\Green resolution $\sim$ 15 $\mu$m at $p_T$ = 15; 35 $\mu$m at 2 GeV.}

\item Tuning of impact parameter errors performed with single
         pion samples ( $p_T$ = 2 to 15 GeV/$c$.)

   \item Using the parameterization:
    $$\sigma_B^2 = \sigma_0^2 + (\frac{\alpha_{ms}}{P_T})^2 $$

   \item Find \verb+   +$\sigma_0 = 12.6 \ \mu$m \\
         \verb+        +$\alpha_{MS} = 49.7$ (GeV/$c)\cdot \mu$m.
   \item {\Blue Define IP significance as: 
    $$S_B = \frac{B}{\sigma_B(p_T)} $$}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Impact Parameter Resolution}}
\end{center}
\Large
\vspace{2mm}
\begin{itemize}
   \item Check impact parameter resolution in \bb{} (upper plot)
         and \tt{} events (lower plot) for STT tracks matched to MC
         tracks coming from the primary vertex:

         \vspace{0.1cm}
         \centerline{\psfig{figure=fs_svt_tksel_bb.eps,height=8cm}}

         \vspace{0.1cm}
         \centerline{\psfig{figure=fs_svt_tksel_tt.eps,height=8cm}}

   \item The parameterization of impact parameter errors derived from
         single pion events is also valid for \bb{} and \tt{} events. 
\end{itemize}


%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Track Selection}}
\end{center}
\Large
\vspace{2mm}
\begin{itemize}
   \item {\Green Select good STT tracks using quality cuts:}
      \begin{enumerate}
         \item {\Green $N_{layer} \geq 3$;}
         \item {\Green Track fit reduced $\chi^2 \leq 4$.}\\
            Note : tracks with $\chi^2 \geq 4$ are refitted 
            after dropping the hit with the largest  $\chi^2$ and the
            cut is reasserted. This leads to 30\% gain in efficiency
      \end{enumerate}

    \item {\Green $\chi^2$ cut removes badly reconstructed tracks}
      \begin{itemize}
        \item plot shows increase in the width of impact parameter
          distribution for primary tracks for different
          $\chi^2$ ranges : 0--2, 2--4, 4--10, $\geq$ 10.
      \end{itemize}

\end{itemize}

\vspace{-0.5cm}
\centerline{\psfig{figure=fs_svt_chi2.eps,height=14cm}}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Impact Parameter Significance}}
\end{center}
\Large
\vspace{0.5cm}
\begin{itemize}
   \item IP significance distribution for matched tracks:
         \begin{itemize}
            \item Yellow $\rightarrow$ tracks coming from primary vertex
          \end{itemize}

\vspace{-0.5cm}
\begin{minipage}[b]{.46\linewidth}
\hspace{-3.0cm}\psfig{figure=fs_svt_sip_bks.eps,width=4.0in}
\end{minipage}\hfill
\begin{minipage}[b]{.46\linewidth}
\hspace{-3.0cm}\psfig{figure=fs_svt_sip_ttaj.eps,width=4.0in}
\end{minipage}

   \item Correlation between high impact parameter tracks and tracks from 
    $b$-quark decays (yellow histogram)

\centerline{\psfig{figure=fs_svt_siptop_bjet2.eps,height=10cm}}

\end{itemize}

%%%%SLIDE%%%%
%%========================================================================
%                     Page 1 : STT Studies for ttbar Events
%========================================================================
%
\newpage
\centerline{\LARGE {\bf \red  $t\bar{t}$ Events}}
%                ==========================================
\Large
\black
%\vspace{2mm}
%
\begin{itemize}
   \item Signal samples (ISAJET):
      {\violet
      \begin{enumerate}   
         \item \ttaj{} events (+0, +3 min.bias)
         \item \ttmj{} events
      \end{enumerate}
      }
\item Background Samples :
      \begin{itemize}
        \item `Standard' QCD background samples generated in 6 $p_T$ bins
        \item samples with 1, 3, 5, 7 additional interactions mixed to simulate
        ${\cal L} = 2\cdot 10^{32}$ cm$^{-2}$s$^{-1}$ and 
        beam crossing time = 132 ns;
      \end{itemize}
   
\vspace{-1cm}
\begin{figure}[pht]
 \begin{flushleft}
  \begin{sloppypar}
   \parbox{8cm}{ \mbox{
    \psfig{figure=svt_tksel_tt.eps,width=8.0cm}
                      }
               }
   \parbox{8cm}{ \mbox{
    \psfig{figure=svt_sip_ttaj.eps,width=8.0cm,height=8cm}
                      }
               }
  \end{sloppypar}
 \end{flushleft}
\end{figure}
 
   \vspace{-2cm}
   \item high multiplicity of STT tracks, even after \\
         $\mid S_B \mid > 2.5$ cut

   
\vspace{-1cm}
\begin{figure}[pht]
 \begin{flushleft}
  \begin{sloppypar}
   \parbox{8cm}{ \mbox{
    \psfig{figure=svt_ntktop_ttaj.eps,width=8.0cm}
                      }
               }
   \parbox{8cm}{ \mbox{
    \psfig{figure=fs_svt_ntkall_ttaj.eps,width=8.0cm,height=8cm}
                      }
               }
  \end{sloppypar}
 \end{flushleft}
\end{figure}

 \end{itemize}
%
%========================================================================
%%========================================================================
%                     Page 2 : Efficiency vs. Background
%========================================================================
%
\newpage
\centerline{\LARGE {\bf \red Efficiency Versus Rates}}
%                ==========================================
\Large
\black
\boldmath
\vspace{2mm}
%
\begin{itemize}
   {\blue
   \item Calorimeter--only trigger (JET2MED):
      \begin{description}
         \item[Level 1:] $\geq 2$ jets with $E_T > 7$ GeV
         \item[Level 2:] $\geq 2$ jets with $E_T > 20$ GeV
      \end{description}
   }
   {\red
   \item[$\Rightarrow$] \ttaj{} efficiency = 98.3\% \\
                       L2 background rate = 85 Hz
   }
   \item JET2MED + STT

   \vspace{2mm}
   \centerline{\psfig{figure=svt_effbgd_jet2med.eps,height=13cm}}

   {\red
   \item[$\Rightarrow$] Factor of $\sim 4$ background rejection
                        for signal \\
                        efficiency = 80\% 
   }

\end{itemize}
%
%========================================================================
%%========================================================================
%                     Page 3 : Trigger Scheme
%========================================================================
%
\newpage
\centerline{\LARGE {\bf \red \tt{} Trigger Scheme}}
%                ==========================================
\Large
\black
\vspace{2mm}
%
\begin{itemize}
   {\blue
   \item Optimize signal efficiency by combining various \\
         triggers
   }
\end{itemize}

\begin{center}
\begin{tabular}{|l||c|c||c|c||c|c|} \hline \hline
 & \multicolumn{2}{c||} {Bgd.(Hz)}
 & \multicolumn{2}{c||} {\ttmj{}}    
 & \multicolumn{2}{c|} {\ttaj{}}    \\ \hline
 Trigger 
 & L1 & L2
 & L1(\%) & L2(\%)
 & L1(\%) & L2(\%) \\ \hline
 1--JMULT   & 49.7 & 2.1  & 88.9 & 27.4 & 98.6 & 69.8 \\
 2--MJTMET  & 55.2 & 3.3  & 93.4 & 68.5 & 82.0 & 48.7 \\
 3--JMAX    & 49.7 & 13.0 & 88.9 & 68.3 & 98.6 & 84.2 \\
 4--MUJET   & 64.1 & 41.6 & 75.4 & 74.3 & 53.2 & 53.6 \\
 5--JET2MED & 186  & 85.2 & 96.5 & 88.3 & 99.3 & 98.3 \\ \hline
  & & & & & & \\
$\Sigma\, (1\rightarrow 3)$ & 82.5 & 17.2 & 96.0 
                            & 86.0 & 99.6 & 96.2 \\
  & & & & & & \\
 {\green $\Sigma\, (1\rightarrow 5)$} & {\green 239}  & {\green 113} 
                                      & {\green 98.4} & {\green 96.1} 
                                      & {\green 99.9}  & {\green 99.8} \\ \hline
  & & & & & & \\
 {\red $\Sigma\, (1\rightarrow 3)+$} & {\red 239}  & {\red 38.5} 
                                     & {\red 98.4} & {\red 92.9} 
                                     & {\red 99.9} & {\red 98.6} \\ 
 {\red $\Sigma (4\rightarrow 5)\!\times\! STT$} & & & & & & \\
 \hline \hline
\end{tabular}
\end{center}
{\rm
{\unboldmath
\vspace{0.1cm}
JMULT:  $\ \ge$ 4 jets with $E_T \ge 15$ GeV \\ 
MJTMET: $\ \ge 3\ E_T^{jet} \ge 10$ GeV + missing $E_T \ge 20$ GeV \\ 
JMAX:   $\ \ge$ 1 jet with $E_T \ge 45$ GeV \\ 
MUJET:  $\ \ge 1\ p_T^{\mu} \ge 6$, $E_T^1 \ge 20$ GeV and 
                    $E_T^2 \ge 10$ GeV \\ 
JET2MED: $\ \ge$ 2 jets with $E_T \ge 20$ GeV \\ 
STT:  at least 2 tracks with $\mid S \mid \ge 2.5$ ($\epsilon_{signal}$ = 80\%)
}
}

\begin{itemize}
   {\red
   \item[$\Rightarrow$] The STT would allow to optimize the trigger \\
         efficiency for \tt{} events without leading to a large background
         rate increase.
   }
\end{itemize}
%
%========================================================================

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Efficiency and Background for $t\bar{t}$ Events}}
\end{center}
\Large
\vspace{2mm}
\begin{itemize}
   \item L2JET\_2\_MED trigger defined as :\\
    \shif $\ \ge$ 2 jets with $E_T \ge 20$ GeV.

   \item Signal efficiency and QCD background trigger rates for the
         trigger combination L2JET\_2\_MED * STT:

   \vspace{1.0cm}
   \centerline{\psfig{figure=fs_svt_eff_jet2med.eps,height=16cm}}

   \item{\Blue $e.g$ requiring at least 1 track with 
         $\mid S_B \mid \geq 3$ \\
    \imply a factor 2 reduction of the background
         rates while keeping a 87\% efficiency for the signal.}

\end{itemize}


%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Efficiency versus Background ($t\bar{t}$)}}
\end{center}
\Large
   \vspace{1.0cm}
   \centerline{\psfig{figure=fs_svt_effbgd_ntkall.eps,height=18cm}}


%%%%SLIDE%%%%****************************************
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Higgs Search }}
\end{center}
\begin{itemize}
  \item Signal Sample : $p\bar{p} \rightarrow W + H^0, Z + H^0$
    \begin{itemize}
      \item[with]  $H \rightarrow b\bar b$  and \sshif 
                    and $W \rightarrow q\bar q$ (67\%); 
                    $Z \rightarrow q\bar q$ (70\%)
    \end{itemize}
  \item Background : ``standard sample''

  \item Tev2000 study \\
    \shif $p\bar{p} \rightarrow W(\rightarrow e\nu, \mu\nu) + H^0 (\to b\bar b) $

\begin{center}
\begin{tabular}{c|c} 
 $M_{Higgs}$        &       $\int {\cal L}$ fb$^{-1}$  \\
\hline  
    80              &           5       \\
   100              &           10      \\
   120              &           25      \\
 \hline 
\end{tabular}
\end{center}

\item  extend study beyond  leptonic W decays, 
    and include also $Z \to\nu\nu$ and $Z \to hadrons$

\item Specific study : \\
    \shif $p\bar{p} \rightarrow W + H^0 \rightarrow q\bar q b\bar b$

\item{\Green jet trigger rate and efficiencies :}
\end{itemize}

\vspace{-0.5cm}
\begin{center}
  \begin{tabular}{|l|c|r|r|r|r|} \hline
         &  Cal. Thresh. & \multicolumn{2}{c|}{L1} &
                                  \multicolumn{2}{c|}{L2}  \\ 
  Trigger & n (L1,L2) GeV & r (Hz) &\effi(\%)& r(Hz) & \effi(\%) \\
  \hline
  \JNX{3}{LOW}  &  3  (3,5) & 2000 & 100 & 140 & 78 \\
  \JNX{3}{MED}  &  3  (5,10)& 200  &  91 &  63 & 74 \\
  \JNX{3}{HIGH} &  3  (7,15)& 52   &  71 &  15 & 52 \\
  \JNX{4}{LOW}  &  4  (3,5) & 670  &  98 &  13 & 36 \\
  \JNX{5}{LOW}  &  5  (3,5) & 250  &  93 & 2.0 & 8 \\
  \hline
 \end{tabular}
\end{center}

\begin{itemize}
\item {\Green All studies relative to  \JNX{3}{MED} trigger}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Track multiplicity}}
\end{center}
\vspace{2cm}

Track multiplicity for signal and background for 
various track $p_T$ thresholds\\
\vspace{1cm}

{\hspace{1.3in} CFT tracks \hspace{2in} STT tracks\\}

\vspace{-2cm}

\begin{minipage}[b]{.46\linewidth}
\hspace{-2.0cm}\psfig{figure=jh_int-cftmult.eps,width=4.2in}
\end{minipage}\hfill
\begin{minipage}[b]{.46\linewidth}
\hspace{-2.0cm}\psfig{figure=jh_sipt.eps,width=4.2in}
\end{minipage}


%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Efficiency vs. Background Rate }}
\end{center}
\vspace{1.5cm}
{\Blue\centerline{STT $p_T$ threshold}}

\centerline{ \psfig{figure=jh_sipt2.eps,height=10cm}}

{\Blue\centerline{ Impact parameter and Significance}}

\centerline{ \psfig{figure=jh_bmax_sbmax_comp.eps,height=10cm}}

%\centerline{ \psfig{figure=jh_bmax.eps,height=10cm}}
%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Benefits of STT for Higgs triggers}}
\end{center}
%\vspace{2.5cm}

\begin{center}
  \begin{tabular}{|c|c|c|c|c|} \hline
  Trigger & \multicolumn{4}{c|}{Background Rejection for $\epsilon =$} \\ 
   & 90\% &80\% &  50\% &10\%\\ \hline
 N CFT tracks & & & & \\
 w/$p_T\ge 3$&         2.5 &4.7  &  10 &35 \\ \hline
 N STT tracks & &  & &\\
 w/$p_T\ge 3$&        3.1 &7.5   &   40 &1000 \\
 w/$b\ge 30$  &        2 & 3.8  &   27 &900\\ \hline
 N STT tracks & & & & \\
 $\overline{b_{25}}\ge X$
             &        2.2 &3.8     &  21 &300  \\
      w/$S_{25}\ge X$  &   2  &5   & 27 &200   \\ \hline
 N w/$p_T\ge 3$ & & & &\\
 and $\overline{S_{25}}\ge X$ 
             &        2.8 &7.1   &  33  &650 \\
  \hline
  \end{tabular}
\end{center}
%\vspace{2.0cm}

{\Blue
\begin{itemize}
  \item rejection(STT)/rejection(CFT)\\
   $\approx 1.2 ~~{\rm for}~~ \epsilon_{signal} = 90\% $\\
  $\approx 1.5 ~~{\rm for}~~ \epsilon_{signal} = 80\% $\\
$\approx ~~4 ~~{\rm for}~~ \epsilon_{signal} = 50\%  $\\
$\approx ~10 ~~{\rm for}~~ \epsilon_{signal} = 10\%  $

  \item can maintain L2 trigger rate of\\
  \tab  20 Hz  with efficiency = 68\%
\end{itemize}
}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Triggering on $Z \to b \bar b$}}
\end{center}
\Large
\vspace{-0.25cm}
%{\centerline{(Meenakshi Narain)}}
\vspace{0.5cm}


\begin{itemize}
  {\Blue
  \item Control sample for
    \begin{itemize}
        \item top mass measurement
        \item Higgs$\to b \bar b$
    \end{itemize}
  \item Check $b$-jet energy scale
  \item Optimize/check $b \bar b$ mass resolution}

  \item Signal Sample : $Z \to b \bar b$       -- 10k events
  \item Background : ``standard sample''

\item{\Green Trigger rates and efficiencies using Cal and CFT objects}
\end{itemize}
\vspace{-1cm}
\begin{center}
  \begin{tabular}{|l|c|r|r|r|r|} \hline
         &  Cal & \multicolumn{2}{c|}{L1} &
                                  \multicolumn{2}{c|}{L2}  \\ 
  Trigger & n(L1,L2) & r (Hz) &\effi(\%)& r(Hz) & \effi(\%) \\
  \hline
  \JNX{2}{MIN}  &  2(3,10) & 8028 &  82 &1390 & 67 \\
  \JNX{2}{MED}  &  2(5,15) &  621 &  56 & 264 & 41 \\
  \JNX{2}{MAX}  &  2(7,20) &  186 &  32 &  85 & 20 \\
  \JNX{3}{MIN}  &  3(3,10) & 1502 &  68 & 132 &  9 \\
  \JNX{3}{MED}  &  3(5,15) &  167 &  31 &  25 &  4 \\
         &  Cal/CFT &      &     &     &    \\
         & n(L1,L2)+(n,$p_T$)  & & & & \\
  \JNX{2}{MIN}\_T1  &  2(3,10)+(2,3) & 2389 &  67 & 866 & 57 \\
  \JNX{2}{MIN}\_T2  &  2(3,10)+(3,3) & 1319 &  57 & 541 & 50 \\
  \JNX{2}{MED}\_T1  &  2(5,15)+(2,3) & 450  &  48 & 201 & 35 \\
  \hline
 \end{tabular}
\end{center}

\begin{itemize}
\item{\Blue cannot trigger with Cal/CFT only}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Improvement with Silicon Trigger}}
\end{center}
\Large

\centerline{ \psfig{figure=mn_zbb_effrej.eps,height=12cm}}

\begin{center}
  \begin{tabular}{|l|r|r|r|r|r|r|} \hline
 & \multicolumn{2}{c|}{ Cal/CFT} & \multicolumn{4}{c|}{Silicon Trigger} \\
  Trigger  & r (Hz) &\effi(\%)& r(Hz) & \effi(\%)& r(Hz) & \effi(\%) \\
  \hline
  \JNX{2}{MIN}      &  1390  & 67 &  60  & {\color{magenta} 35}   &   20  & {\color{green}  19} \\
  \JNX{2}{MED}      &  264   & 41 & 110  & {\color{magenta} 35}   &   20  & {\color{green}   23} \\
  \JNX{2}{MIN}\_T1  &  866   & 57 &  62  & {\color{magenta} 35}   &   20  & {\color{green}   20} \\
  \JNX{2}{MIN}\_T2  &  541   & 50 &  77  & {\color{magenta} 35}   &   20  & {\color{green}   19} \\
  \JNX{2}{MED}\_T1  &  201   & {\color{magenta} 35} &\multicolumn{4}{c|} {} \\
  \JNX{3}{MED}      &   25   & {\color{green} 4}  &\multicolumn{4}{c|} {} \\
  \hline
 \end{tabular}
\end{center}

\begin{itemize}
\item {\Blue \imply Signal efficiency of 20\% with a background rate of 
20Hz is achievable}
\end{itemize}


%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\Large
\begin{itemize}
\item[] {\Blue An extremely rough estimate of }
\item {\Red Can we see the signal...}
\begin{center}
\begin{tabular}{cccc} 
 $\sigma(p\bar p\to Z\to b \bar b)$    &   $\sim$& 1 nb & \\
 $\epsilon(trigger)$               &   = &20\% & \\
 $\epsilon(offline)$               &   = &25\% & (double b-tag)\\
\imply $\sigma(vis)$               &  = &5 $\times 10^4$ fb& \\
\end{tabular}
\end{center}

\vspace{1.0cm}
\item {\Red ... over background}
\begin{center}
\begin{tabular}{cccc} 
 $\sigma$ = 20Hz/$2\times 10^{32}$/cm$^2$/s &   = & 100 nb& \\
 $\epsilon(offline) $               &  =& 10\% &(double b-tag)\\
\imply $\sigma(vis)$               &   =& $10^7$  fb& \\
\end{tabular}
\end{center}

\vspace{2.5cm}
\item {\Green for 1 fb$^{-1}$ : S/B = 5 $\times 10^4$/$10^7$ \\
    \shif              S/$\sqrt{\rm B}$ = 17 }

\end{itemize}
%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{SUSY 4 $b$ Signature}}
\end{center}
\Large
\vspace{-0.25cm}
%{\centerline{(Doug Norman)}}

\begin{itemize}
 \item $\tilde{g}\tilde{g}\rightarrow 4b$ could give us
    a handle on the region of SUSY parameter space
 \item B($\tilde{g}\tilde{g}\rightarrow 4b$) is very model dependent.

\item Trigger sets are extensions of the JetMax trigger and \\
    include CFT and/or STT information.
\item Rejections determined relative to JetMax trigger $\sim$ 13 Hz.
\end{itemize}

\centerline{\psfig{figure=dn_susy4b.eps,height=10cm}}

{\rm{\unboldmath
JetMAx:  Four L1 jets with $E_T >$ 5 GeV and one L2 jet with $E_T >$ 45 GeV.\\
}}

\begin{itemize}
\item {\Green CFT and STT give comparable eff/rejections for this channel
as the track multiplicity in these events are extremely high}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{$B$-physics}}
\end{center}
\Large
\vspace{2mm}
%
\begin{itemize}
   \item STT studies using various samples:
      \begin{enumerate}   
         \item \bkspsi{}, $J/\psi \rightarrow\,\mu^+\mu^-$ 
                  \verb+  +({\boldmath $CP$} asymmetry)
         \item \bsds3pi{}, \dskkp{} ({\boldmath $B_s$} mixing)
         \item \bsdsphi{}, \dskkp{} ({\boldmath $B_s$} mixing)
      \end{enumerate}

   \item Low multiplicity of charged particles

\vspace{-5mm}
\begin{figure}[pht]
 \begin{flushleft}
  \begin{sloppypar}
   \parbox{8cm}{ \mbox{
    \psfig{figure=svt_tksel_bks.eps,width=8.0cm}
                      }
               }
   \parbox{8cm}{ \mbox{
    \psfig{figure=svt_sip_bks.eps,width=8.0cm,height=8cm}
                      }
               }
  \end{sloppypar}
 \end{flushleft}
\end{figure}
 
   \vspace{-15mm}
   \item Investigate various combinations of muon triggers and STT.
   \item  Possible trigger scheme for {\boldmath $b\bar{b}$} events.
\vspace{-2mm}
\begin{center}
\begin{tabular}{|l||c||c|c|c|} \hline \hline
 Trigger & rate & \psiks{} & \dsphi{} & \ds3pi{} \\ \hline 
$\bullet$ Single muon & 38.6 Hz & 23.9\% & 11.8\% & 4.6\%  \\ \hline
$\bullet$ Dimuon +STT &  7.6 Hz & 14.9\% &  5.5\% & 0.3\%  \\ \hline
{\red $\bullet$ Single + dimuon}  & {\red 45.0 Hz} & {\red 31.9\%} 
                                  & {\red 15.6\%}  & {\red 4.9\%}  \\
 \hline \hline
\end{tabular}
\end{center}

\boldmath
{\red
\item $\epsilon_{trig}(B_d^{\circ} \rightarrow J/\psi \, K_s) = 32$\% 
      \verb+  +$\Rightarrow$ \verb+ +8.5k --- 13k fully \\
      \verb+                                +reconstructed events
}
\end{itemize}
%%%%%SLIDE%%%%
%========================================================================
%%========================================================================
%                     Page 2 : single muon trigger
%========================================================================
%
\newpage
\centerline{\LARGE {\bf \red Single Muon Triggers}}
%                ==========================================
\Large
\black
\boldmath
\vspace{2mm}
%
\begin{itemize}
   {\blue
   \item Investigate various options of a single muon trigger.
   }
\begin{center}
\begin{tabular}{|l||c||c|c|} \hline \hline
 Trigger Conf.   & L2 rate &  \psiks{} & \ds3pi{}  \\ \hline
 $\bullet \ p_T > 6$, $\mid \eta \mid < 2$ & 13.5 Hz & 10.8\% & 1.4\%  \\
{\red $\bullet \ p_T > 4$, $\mid \eta \mid < 2$ } 
          & {\red 38.6 Hz} & {\red 23.9\%} & {\red 4.6\%}  \\ \hline
 $\bullet \ p_T > 4$ + CFT & 21.0 Hz       & 13.5\%  & 2.0\%  \\
 $\bullet \ p_T > 4$ + STT & 13.2 Hz       & 17.3\%  & 2.5\%  \\
 \hline \hline
\end{tabular}
\end{center}

   {\red
   \item In case the single muon trigger rate would need to be reduced, the STT 
         would be very helpful to preserve a good signal efficiency.
   }

   \vspace{2mm}
   \centerline{\psfig{figure=svt_effbgd_bks.eps,height=13cm}}

\end{itemize}
%
%
%%%%SLIDE%%%%%
%========================================================================
%%========================================================================
%                     Page 3 : dimuon trigger
%========================================================================
%
\newpage
\centerline{\LARGE {\bf \red Dimuon Triggers}}
%                ==========================================
\Large
\black
\vspace{2mm}
%
\begin{itemize}
   {\blue
   \item Play with $p_T$ threshold on both muons:
   }

\begin{center}
\begin{tabular}{|l||c||c|c|} \hline \hline
   Trigger                    & L2 rate        & \psiks{}      & \dsphi{}\\ \hline
$\bullet$ (2 GeV, 4 GeV)      &  1.1 Hz        &  8.8\%        & 2.5\%   \\ 
$\bullet$ (2 GeV, 2 GeV)      &  272 Hz        & 20.1\%        & 8.2\%   \\
{\red $\bullet$ (2,2) + STT}  &  {\red 7.6 Hz} & {\red 14.9\%} & {\red 5.5\%}\\
$\bullet$ (2,2)+ $E_T^{jet} > 10$ GeV & 102 Hz & 0.9\%         & 0.5\%  \\ 
 \hline \hline
\end{tabular}
\end{center}

   {\red
   \item The STT allows to reduce the rate of the low threshold trigger
         (2,2) while preserving a better efficiency than (2,4). It is
         much more efficiency than asking for a jet.
   }

\vspace{2mm}
\centerline{\psfig{figure=svt_effbgd_2mu.eps,height=13cm}}

\end{itemize}
%
%=======================================================================

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ $z$ vertex Determination }}
\end{center}
\Large
\vspace{-0.25cm}
%{\centerline{(Meenakshi Narain)}}
\Large
\vspace{1.0cm}
{\Green 
Use hits in Layer1 and Layer3 of the 4 inner barrels of the
Silicon detector instrumented with 90$^\circ$ stereo strips for fast 
$z$-vertex position determination } \\
\vskip 0.5cm
\centerline{Possible algorithms for z\_vertex finding:}
 \begin{itemize}
 \item[1.] Form all possible tracks connecting the hits 
 in both layers, intersect with beam axis and 
 look for peak(s) in resulting $z$-distribution to find the vertex;
  \begin{itemize}
  \item number of combinations formidable (4000+) for high multiple interaction 
  events
  \end{itemize}
 \item[2.] Move along $z$-axis (in bins), connect with hit on outer layer, 
 look for matching hit on inner layer; look for $z$-bins with many
 matching hits (find peak(s) in $z$-distribution).
  \begin{itemize}
  \item {\Green {Possible to implement this by scaling the inner layer hits to outer
  layer radii and looking for possible coincidences. }}
 %   {\Blue {\imply   S. Mani}}
  \item {\Green{ Independent of number of interaction in the events}}
  \end{itemize}
\vspace{1cm}
\item {\Blue{$z$-vertex finding region limited to $\sim$ $\pm$25cm due to limited
\# of barrels with 90$^\circ$ stereo strips.}}
\end{itemize}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Event vertices }}
\end{center}
\Large
%\vspace{0.5cm}
{\centerline{ $Z\to b\bar b$+ 2 minbias events }}

\begin{itemize}
\item {\Green Event 1:}
\begin{itemize}
  \item High $p_T$ vertex correctly identified
  \item 3rd vertex at 45 cm
\end{itemize}

\centerline{ \psfig{figure=zv_ev1.eps,height=8.0cm,width=5in}}
\vspace{-0.5cm}
\item {\Green Event 2:}
\begin{itemize}
  \item Min Bias vertex identified as high $p_T$ vertex 
  \item High $p_T$ vertex at 15.5 cm
  \item 3rd vertex at -71 cm
\end{itemize}
\end{itemize}

\centerline{ \psfig{figure=zv_ev175.eps,height=8.0cm,width=5in}}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\vspace*{-1cm}
\Red{\underline{ $z$-vertex Resolution and efficiencies }}
\end{center}

\begin{itemize}
  \item Sample used :
    \begin{itemize}
      \item  $Z\to b\bar b$ events   (199 events)
      \item  $Z\to b\bar b$+ 2 minbias events (199 events)
    \end{itemize}

  \item{\Blue $z$-vertex resolution $\sim$ 600$\mu$m \\
        \sshif\imply independent of additional interactions in the event}
\end{itemize}

  \centerline{ \psfig{figure=zv_res_03int.eps,height=12.0cm}}
  

\begin{center}
\begin{tabular}{|l||c|c|} \hline \hline
 No of events                           &   199          &          199 \\ \hline  
 Found at least one vertex              &   145          &          196 \\
 vertex not found                       &    54          &            3 \\ \hline
 High $p_T$ vertex $|z|\sleq$ 30cm      &   153          &          153 \\
 Found vertex is High $p_T$ vertex      &   145          &          112 \\
 \hline \hline
\multicolumn{3}{|c|}{    High $p_T$ vertex   ($|z|\sleq$ 30cm)} \\
 Efficiency of finding High $p_T$ vertex  & 95\%          &         73\% \\
 "wrong vertex" events                    & -             &         26\% \\
 \hline \hline
\end{tabular}
\end{center}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ $z$-vertex Distributions }}
\end{center}

\centerline{ \psfig{figure=zvertex-dist.eps,height=9.in}}

%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{ Gain for electron and jet thresholds at L3 }}
\end{center}

\begin{itemize}
\item {\Green Electrons :}
\end{itemize}
\centerline{ \psfig{figure=mn_ztrig_ele.eps,height=10cm}}

\begin{itemize}
\item {\green Jets :} (Ransom Stephens)
\end{itemize}
\vspace{1.5cm}
\centerline{ \psfig{figure=rs_ztrig_jets.ps,height=10cm}}
\vspace{-2.5cm}
{\Blue
\begin{itemize}
\item Sharper turn-on for electron and jets at L3 
\item (Not clear if fast vertexing available at L3)
\end{itemize}
}
%%%%SLIDE%%%%
\newpage
\bf
\vspace*{-1.0cm}
%\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{Conclusions }}
\end{center}
\LARGE
%\vskip 2cm
\Blue
\vspace*{-0.5cm}
\begin{itemize}
\item use of Si detector hits in track fit\\
\imply improve momentum resolution\\
\tab    \imply \purple{sharper $p_t$ thresholds,}\\
\tab    \tab \purple{ E/p for electrons at L2;}\\
% \tab  -- potentially benefits any trigger
\vspace*{-0.5cm}
\Blue
\item trigger on tracks with high impact parameter \\
    \imply trigger on events containing $b$-quarks;
\begin{itemize}
\item \purple{ provides very powerful handle for background rejection, with good signal efficiency, for
many interesting physics channels:}
\begin{itemize}
\item $B$-physics,
\item $Z \to b \overline b$,
\item Higgs$\to b \overline b$,
\item $t \bar t$,
\item single top
\item $\ldots$\\
\end{itemize}
\end{itemize}
\item use Si detector (90$^\circ$ stereo) information for fast
$z$-vertex position\\
   \imply
  \purple{     sharper electron and jet $p_T$ thresholds at L3}
%    \     beam tilt $\rightarrow$ need z for impact parameter determination;
\vspace*{-0.5cm}
\Blue
\item Hit finder for L3 \\
    \imply 
    \purple{ save processing time in L3 by providing
    hit positions for $r/\phi$ and stereo (both 90$^\circ$ and 2$^\circ$),
    making use of Si detector information at L3 possible or more efficient.}
\end{itemize}
\newpage
\begin{center}
{\purple \bf SUMMARY} 
\end{center}
\bigskip\bigskip
\Blue
\begin{itemize}
\item have done simulations of performance 
of STT\\
as realistic as possible with the available tools;
\item have made assessment of incremental gains in rejection power over that
possible with existing trigger tools;
\item simulation of performance was done with algorithms similar to what can be
implemented in hardware;
\item have shown that STT expands capabilities of presently foreseen trigger
system, adding additional handles for background rejection and rate control.
\end{itemize}






\end{document}




%%%%%
\end{document}
%%%%%
%%%%%
%%%%
%%%%SLIDE%%%%
\newpage
\bf
\mbox{}
\begin{center}
\LARGE\bfseries
\Red{\underline{  XXX }}
\end{center}
