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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich)}
\institute{UZH}
\title[Magnet Stations for LHCb]{Magnet Stations for LHCb}
\begin{document}
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{
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\begin{frame}[c]%{\phantom{title page}}
\begin{center}
\begin{center}
\begin{columns}
\begin{column}{0.75\textwidth}
\flushright\fontspec{Trebuchet MS}\bfseries \Huge {Magnet Stations\\ for LHCb}
\end{column}
\begin{column}{0.02\textwidth}
{~}
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% \hspace*{-1.cm}
\vspace*{-3mm}
\includegraphics[width=0.6\textwidth]{lhcb-logo}
\end{column}
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\end{center}
\quad
\vspace{3em}
\begin{columns}
\begin{column}{0.99\textwidth}
\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} Marcin Chrząszcz, Marc-Oliver Bettler, Igor Babuschkin,\\ Maurizio Martinelli, Christ Parkes, Marco Gersabeck}
\end{column}
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\vspace{1em}
% \footnotesize\textcolor{gray}{With N. Serra, B. Storaci\\Thanks to the theory support from M. Shaposhnikov, D. Gorbunov}\normalsize\\
\vspace{0.5em}
\textcolor{normal text.fg!50!Comment}{MS meeting, September 26, 2016}
\end{center}
\end{frame}
}
\begin{frame}\frametitle{Where our tracks are?}
\begin{columns}
\column{0.1in}
{~}\\
\column{3in}
\ARROW The upstream tracks have rather poor momentum resolution: $\frac{\Delta p}{p} \sim 15\%$. \\
\ARROW The particles die after short and sad (for physics) life in the magnet yoke. \\
\ARROW If one put chambers in the magnet stations, one could record the particles before they death.\\
\ARROW This will not increase the material budget of the rest of the detector.
\column{2in}
\includegraphics[width=0.95\textwidth]{images/sketch.png}\\
\includegraphics[width=0.95\textwidth]{images/magnet.png}
\end{columns}
\end{frame}
\begin{frame}\frametitle{Physics interest}
\begin{small}
\begin{columns}
\column{0.1in}
{~}\\
\column{3in}
\ARROW We have enormous amount of channels where we have slow particles:
\begin{itemize}
\item $\PDstar \to \PD \pi$.
\item $\PLambda_c(2595, 2625) \to \PLambda_c \pi \pi$.
\item All the $\PB^{\ast \ast}$ decays! $\leftarrowtail$ huge community interests!!!
\item As well other states: $\Sigma_b \to \PLambda_b \pi$.
\item Little is known about the excited $\PBs$ states as well.
\item $\tau \to 3 \mu$.
\end{itemize}
\column{2in}
\includegraphics[width=0.95\textwidth]{images/charmS.png}\\
\end{columns}
\end{small}
\end{frame}
\begin{frame}{$\tau$ production}
\begin{minipage}{\textwidth}
\begin{itemize}
\item $\Ptau$'s in LHCb come from five main sources:
\end{itemize}
\begin{center}
\begin{tabular}{| c | c | c | }
\hline
Mode & $7~\TeV$ & $8~\TeV$ \\ \hline
Prompt $\PDs\to\Ptau$ & $71.1\pm3.0\,\%$ & $72.4\pm2.7\,\%$ \\
Prompt $\PDplus\to\Ptau$ & $4.1\pm0.8\,\%$ & $4.2\pm0.7\,\%$ \\
Non-prompt $\PDs\to\Ptau$ & $9.0\pm2.0\,\%$ & $8.5\pm1.7\,\%$ \\
Non-prompt $\PDplus\to\Ptau$ & $0.18\pm0.04\,\%$ & $0.17\pm0.04\,\%$ \\
$X_{\Pbottom}\to\Ptau$ & $15.5\pm2.7\,\%$ & $14.7\pm2.3\,\%$ \\ \hline
\end{tabular}
\end{center}
\ARROW For this study I simulated the $\tau$'s coming from $\rm c$\\
%\ARROW For now limited statistics simulated ($ \mathcal{O}(100)$).
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}{$\tau$ simulation}
\begin{minipage}{\textwidth}
\ARROW $9~\%$ of the $\tau$ that are produced in LHCb acceptance ($\eta <5$) have a muon that ends in the magnet tracking stations!
{~}\\{~}\\
\only<1>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/tauxy.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/tauyz.png}
\end{columns}
\ARROW Rather uniform distribution.
}
\only<2>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/taupz.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/taupy.png}
\end{columns}
{~}\\
\ARROW If we exclude the $\pm 150 \rm cm$ regions we loose $14\%$.
}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}{$\tau$ decay model}
\begin{minipage}{\textwidth}
\ARROW $\tau$ are decayed with PHSP.\\
\ARROW Might be worth in looking at the specific models:\\
{~}\\
\includegraphics[width=0.3\textwidth]{images/radlr_emm.pdf}
\includegraphics[width=0.3\textwidth]{images/vllll_mmm.pdf}
\includegraphics[width=0.3\textwidth]{images/vllrr_mmm.pdf}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}{$\PDstar$ simulation}
\begin{minipage}{\textwidth}
\ARROW $10~\%$ of the $\tau$ that are produced in LHCb acceptance have a muon that ends in the tracking stations!
{~}\\{~}\\
\only<1>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Dstarxy.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Dstaryz.png}
\end{columns}
\ARROW Clearly different behaviour than $\mu$.
}
\only<2>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Dstarpz.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Dstarpy.png}
\end{columns}
{~}\\
\ARROW If we exclude the $\pm 150 \rm cm$ regions we loose $17\%$.
}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}{$\PLambda_c^{\ast}$ simulation}
\begin{minipage}{\textwidth}
{~}\\
\ARROW $19~\%$ of the $\tau$ that are produced in LHCb acceptance have a muon that ends in the tracking stations!
{~}\\{~}\\
\only<1>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Lcxy.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/LCyz.png}
\end{columns}
\ARROW Clearly different behaviour than $\mu$.\\
\ARROW We have two slow pions. The efficiency looks like factorizes :)
}
\only<2>{
\begin{columns}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Lcpz.png}
\column{0.5\textwidth}
\includegraphics[width=0.9\textwidth]{images/Lcpy.png}
\end{columns}
{~}\\
\ARROW If we exclude the $\pm 150 \rm cm$ regions we loose $16\%$.
}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}{Summary}
\begin{minipage}{\textwidth}
\ARROW Using 3 benchmark channels we see there is quite a lot to be gain!\\
\ARROW This is just tip of the ice berg. \\
\ARROW We need to strengthen the physics program: ex. $\PLambdac(2595)$ decays via intermediate states like $\PSigmac$ which allows polarization measurements.\\
\ARROW Will add multi bodies to the studies.\\
\ARROW $\PB^{\ast \ast} \to \PK \PB$ will allow constrained the final state measurements.\\
\ARROW The length of this detector can be optimised based on our ''golden channels''.
\end{minipage}
\vspace*{2.cm}
\end{frame}
\backupbegin
\begin{frame}\frametitle{Backup}
\topline
\end{frame}
\backupend
\end{document}
mchrzasz