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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich, IFJ PAN)}
\institute{UZH}
\title[Preselection for $\PLambdab \to \PLambda_c^{\ast} \ell \nu$]{Preselection for $\PLambdab \to \PLambda_c^{\ast} \ell \nu$$}



\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}{0.75\textwidth}
			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {Preselection for $\PLambdab \to \PLambda_c^{\ast} \ell \nu$}
		\end{column}
                \begin{column}{0.02\textwidth}
                  {~}
                  \end{column}
                \begin{column}{0.23\textwidth}
                 % \hspace*{-1.cm}
                  \vspace*{-3mm}
                  \includegraphics[width=0.6\textwidth]{lhcb-logo}
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\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}}

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\end{column}
\end{columns}

\vspace{1em}
		\footnotesize\textcolor{gray}{Universit\"{a}t Z\"{u}rich, \\ Institute of Nuclear Physics, Polish Academy of Science}\normalsize\\
\vspace{0.5em}

	\textcolor{normal text.fg!50!Comment}{CERN\\October 22, 2015}
\end{center}
\end{frame}
}


\begin{frame}[c]{Preselection}

	\begin{minipage}{\textwidth}
\begin{itemize}
\item Stripping has a tight cuts on $\PLambda_c$ candidates but no cuts on $\PLambda_c^{\ast}$.
\item I run a small portion of MC without any cuts(aka paring each $\PLambda_c$ with any 2 pions in the vents).
\item Based on this sample I selected 3 cuts:
\end{itemize}
\begin{center}


\begin{tabular}{|c|c|}
\hline
Var & value \\ \hline
$\pi~\rm Pt$ & $>300~\MeV$\\
$\PLambda_c^{\ast}~\rm VRT \chi^2$ & $<20$\\ \hline
\end{tabular}
\end{center}

\begin{itemize}
\item The MC looks normally after those cuts, but still waiting for data.
\item Efficiency of thouse cuts is $\sim 90~\%$.
\item Idea is to keep the preselection loose but use MVA.
\end{itemize}


	\end{minipage}
		\vspace*{2.cm}
\end{frame}

\begin{frame}[c]{Preselection}
	\begin{minipage}{\textwidth}
\begin{itemize}
\item Impact on MC sample(left no preselection, right after preselection).
\end{itemize}


\begin{columns}
\column{0.5\textwidth}

\includegraphics[width=0.95\textwidth]{nosel.png}
\column{0.5\textwidth}

\includegraphics[width=0.95\textwidth]{sel.png}
\end{columns}

	\end{minipage}
		\vspace*{2.cm}
\end{frame}


\backupbegin   

\begin{frame}\frametitle{Backup}


\end{frame}

\backupend			

\end{document}