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% title slide definition
\title{Preliminary results of $\tau \to \mu \gamma$}
%\subtitle{a bias report}
\author{ Alberto Lusiani$^{1,2}$, Marcin Chrz\k{a}szcz$^{3,4}$  }
\institute[UTH]
{
 %\begin{tiny}
$ ^1$ SNS , $ ^2$ INFN,  $ ^3$ UZH, $ ^4$ IFJ PAN 
 %\end{tiny}smallsmall
}
  

\date{ \begin{small} $28^{th}$ May 2013 \end{small}}

%--------------------------------------------------------------------
%                           Introduction
%--------------------------------------------------------------------

\begin{document}




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%--------------------------------------------------------------------
%                          OUTLINE
%--------------------------------------------------------------------




\section[Outline]{}
\begin{frame}
\tableofcontents
\end{frame}







%-------------------------------------------------------------------
%                          Introduction
%-------------------------------------------------------------------
%
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% Insert infoline
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 {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
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\title{$\tau \to \mu \gamma$}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%2>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{Motivation}
\begin{frame}\frametitle{LFV hunting, "Who ordered that?" I. Rabi}

\begin{small}
The history of LFV dates back to the discovery of muon:

\begin{itemize}
\item After discovery of $\mu$ it was natural to think about it as an excited electron.
\item Unless you have an other neutrino.
\end{itemize}
\includegraphics[scale=0.15]{pic/mu2egamma.png}
\includegraphics[scale=0.25]{pic/cmms.png}


\begin{itemize}
\item Analogy to GIM mechanism.
\end{itemize}


\end{small}

	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}






\section{SuperB vs SuperC}
\begin{frame}\frametitle{Flavour wars, $\Upsilon(4S)$ vs $\psi(3770)$}
\only<1>{
At $\mathcal{B}$ factories one did the following:

\begin{itemize}


\item Calculate the thrust axis.
\item Divide the particles among two hemispheres.
\item No possibility to mix tracks from one $\tau$ with other!
\item We are making a kind of topological tag.
 
\end{itemize}
\includegraphics[scale=0.2]{pic/thrust.png}
}
\only<2>{
What about $\psi(3770)$?

\begin{itemize}


\item $\tau 's$ are produced "almost" at rest $\rightarrow$ No boost.
\item Tracks mix hemispheres.
\item  No previous $\tau$ analysis done under this conditions.
 
\end{itemize}


}




	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}


\section{Studies done so far}
\begin{frame}\frametitle{Studies done so far}

\only<1>{
\begin{small}


H.Hayashii (2008) emphasizes that close to the tau pair production threshold the ISR photon spectrum is limited to small energies and the overlap with the $\tau \to \mu \gamma$ signal photon spectrum tends to zero.
\end{small}

\includegraphics[scale=0.175 ]{pic/ISF.png}


}

\only<2>{

\begin{Huge}
Preliminary report on a work-in-progress to estimate the sensitivity to $\tau \to \mu \gamma$ at a tau-charm factory with Monte Carlo simulated events
\end{Huge}

}


	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5








\section{MC studies}
\begin{frame}\frametitle{MC studies}


\only<1>{
What we have done (not everything up to date):
\begin{itemize}
\item Simulation done with FastSim 3.2.
\item SuperB detector.
\item SuperB beams, with $\beta\gamma = 0.28$.
\item Simulated bck: $\tau\tau$ and continuum up to integrated luminosity of $1 ab^{-1}$.
\item CM energy $\psi(3770)$.
\item Beam energies: $2.2$ and $-1.6 GeV$.


\end{itemize}
}



	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}



\begin{frame}\frametitle{Preselection}


\only<1>{
We demand from each event:
\begin{itemize}
\item Require events with just two charged tracks (85$\%$ of other (tag) $\tau$ decays)
\item $\tau$ reconstructed with energy constrain to CM.
\item select tau candidates with:
\begin{itemize}
\item muon ID(SuperB lists)
\item $E_{\gamma} > 50MeV$ in CM. 
\end{itemize}
\end{itemize}
}






	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}


\begin{frame}\frametitle{Photon spectrum}


\only<1>{
\begin{center}

\includegraphics[scale=0.35]{pic/E_gamma_ISR.png}
\end{center}

}


\only<2>{
\begin{center}

\includegraphics[scale=0.35]{pic/E_gamma_FSR.png}
\end{center}

}

\only<3>{
\begin{center}

\includegraphics[scale=0.35]{pic/E_gamma_pi0.png}
\end{center}

}

\only<4>{
\begin{center}

\includegraphics[scale=0.35]{pic/E_gamma_rest.png}
\end{center}

}






	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{frame}\frametitle{Background estimate in $\Delta E$ vs $\Delta M$}

\includegraphics[scale=0.35]{pic/de_dm.png}


	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}
\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{frame}\frametitle{Resolution}

\includegraphics[scale=0.35]{pic/fit.png}

Resolution: $\approx 18 MeV$.
	\textref {A.Lusiani, M.Chrz\k{a}szcz 2013}


\end{frame}


\begin{frame}\frametitle{Preliminary conclusions}
\begin{itemize}
\item Analysis is ongoing.
\item Completely different environment than $\Upsilon(4S)$.
\item Need to somehow select/reconstruct/tag the other tau, otherwise the problem looks fatal.
\item found few thousand background events in the signal window.
\item Need to VETO $\pi^{0}$.

\end{itemize}


\end{frame}



















\end{document}