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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich)}
\institute{UZH}
\title[The need for speed]{The need for speed}



\begin{document}
\tikzstyle{every picture}+=[remember picture]

{
\setbeamertemplate{sidebar right}{\llap{\includegraphics[width=\paperwidth,height=\paperheight]{bubble2}}}
\begin{frame}[c]%{\phantom{title page}} 
\begin{center}
\begin{center}
	\begin{columns}
		\begin{column}{0.9\textwidth}
			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {The need for speed \\in Semileptonic MC generation}
		\end{column}
		\begin{column}{0.2\textwidth}
		  %\includegraphics[width=\textwidth]{SHiP-2}
		\end{column}
	\end{columns}
\end{center}
	\quad
	\vspace{3em}
\begin{columns}
\begin{column}{0.44\textwidth}
\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}

\end{column}
\begin{column}{0.53\textwidth}
\includegraphics[height=1.3cm]{uzh-transp}
\end{column}
\end{columns}

\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}{$R( \Lambda_c^{\ast})$ meeting, CERN\\September 12, 2015}
\end{center}
\end{frame}
}


\begin{frame}{The problem }
\begin{itemize}
\item The MC generation is quite inefficient $\Rrightarrow$ we generate a lot of events that are lost in the stripping and reconstruction.
\item The dominate systematic in the $R(\PD^{\ast})$ was the MC statistics.
\item Every saved event will buy us something.
\item Ideas:
\begin{itemize}
\item Take really the inclusive states of $\tau$ and $\Lambda_c$.
\item Put generator cuts.
\end{itemize}
\end{itemize}



\end{frame}

\begin{frame}{Generator cuts}

$\Rrightarrow$ We do not need events that have no chance passing our stripping selection. \\
$\Rrightarrow$ We can put reject events based in the generator level on particles that enter in the stripping line: ex.\\ \texttt{[ Lambda\_b0 -> ( Lambda\_c(2595)+ -> (Lambda\_c+ ->\^ p+  \^{K}- \^pi+ )  pi+ pi- )  (tau- -> \^mu- nu\_tau nu\_mu~ ) nu\_tau~ ]CC}\\
$\Rrightarrow$ Only particles with $\hat{~}$ have the following requirements and are required to be in LHCb acceptance.

\begin{center}
  \begin{tabular}{ | l | c | c | c | c | c | }
    \hline
Particle & \multicolumn{2}{|c|}{Generator} &  \multicolumn{2}{|c|}{Stripping} \\ \hline\hline
Hadrons($\Pproton, \Ppi, \PK$)  & $p_T$ & $>200\MeV$ &  $p_T$ & $>300\MeV$ \\ 
Hadrons($\Pproton, \Ppi, \PK$)  & $p$ & $>1800\MeV$ &  $p$ & $>2000\MeV$ \\ 
Muons  & $p_T$ & $>600\MeV$ &  $p_T$ & $>800\MeV$ \\ 
Muons  & $p$ & $>2800\MeV$ &  $p$ & $>3000\MeV$ \\ 
    \hline
  \end{tabular}
\end{center}



\end{frame}

\begin{frame}{Sanity check}
$\Rrightarrow$ Generated 200 events in the MC level and see if the things are ok.
\begin{columns}
\only<1>{
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973004.png}\\
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973005.png}
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973006.png}\\
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973007.png}
}
\only<2>{
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973004.png}\\
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973005.png}
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973006.png}\\
\includegraphics[width=0.95\textwidth]{images/piplus_TRUEPT15973007.png}
}
\only<3>{
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/pplus_TRUEPT15973004.png}\\
\includegraphics[width=0.95\textwidth]{images/pplus_TRUEPT15973005.png}
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/pplus_TRUEPT15973006.png}\\
\includegraphics[width=0.95\textwidth]{images/pplus_TRUEPT15973007.png}
}
\only<4>{
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/muminus_TRUEPT15973004.png}\\
%\includegraphics[width=0.95\textwidth]{images/muminus_TRUEPT15973005.png}
Comment: When I simulate the $3\pi$ $\tau$ decay there is no $\mu$.
\column{0.5\textwidth}
\includegraphics[width=0.95\textwidth]{images/muminus_TRUEPT15973006.png}\\
\includegraphics[width=0.95\textwidth]{images/muminus_TRUEPT15973007.png}
}
\end{columns}



\end{frame}

\begin{frame}\frametitle{Conclusions}

\begin{itemize}
\item I think we squized everything there is from the simulation ;)
\end{itemize}

\end{frame}

\backupbegin   

\begin{frame}\frametitle{Backup}
\topline 

\end{frame}

\backupend			

\end{document}