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\documentclass[noback]{cuposter}
%%\documentclass[noback,portrait]{cuposter}
%% To make a poster in portrait, use the "portrait" option to
%% documentclass as shown above.
\usepackage{mathptmx}
\usepackage{xspace}
\usepackage{amsmath}
\usepackage{pifont}
\usepackage{psfrag}
\usepackage{wrapfig}
\usepackage{color}
%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%% Not needed for most posters.
%%\renewcommand{\poster@ancimage}{/tmp/empty.ps}
\newcommand{\don}{\ensuremath{d_{\textsc{ON}}}}
\newcommand{\doff}{\ensuremath{d_{\textsc{OFF}}}}
\newcommand{\dsoma}{\ensuremath{d_{\textsc{SOMA}}} \xspace}
\newcommand{\um}{\ensuremath{\mu \text{m}}\xspace}
\newcommand{\dmin}{d$_{\textup{min}}$\xspace}
%\title{Status report: \\Development of a time projection chamber for the $\mu^+
%\rightarrow e^+e^+e^-$ experiment}
\title{A study of a new experiment to search for the $\mu^+
\rightarrow e^+e^+e^-$ decay}
%%\subtitle{The poster subtitle here}
\author{Tran Hoai Nam}
\address{Department of Physics, Graduate School of Science, Osaka University}
\makeposter
\section{Introduction}
{\Large
\begin{itemize}
\item New physics beyond the Standard Model: the $\mu^+ \rightarrow e^+e^+e^-$
decay is a forbidden process.
\item Current status of the experiment: upper limit of the branching ratio is
$1.0\times10^{-12}$ \cite{belgrade}.
\end{itemize}
}
%It is known that in the current theoretical framework of particle physics, the
%Standard Model, lepton flavor is conserved. Charged lepton flavor violation
%(cFLV) processes that violates lepton flavor number are not allowed. However,
%extensions of the Standard Model predict that cFLV might occur at the rate that
%future experiments can reach\cite{kunorev}. Experimental observation of such
%processes would provide a clear evidence for new physics beyond the Standard
%Model.
%
%In this study, I am planning to develop a central tracking detector for an
%experimental search for a
%neutrino-less decay of muon, the $\mu^+ \rightarrow e^+e^+e^-$ decay, at the
%MuSIC facility, Research Center for Nuclear Physics, Osaka University. In
%the past, many experiments have been carried out in attempt to find evidence
%for such a process. Among them, the most recent experiment was done at Paul
%Sherrer Institute (PSI) in Switzerland. From the experiment, the upper limit (at
%confidence level of 90\%) for the branching ratio $\mu^+ \rightarrow
%e^+e^+e^-$ normalized to the normal muon decay of $1.0\times10^{-12}$ is
%reported\cite{belgrade}.
%In order to carry out the search for
%Purpose of this research is to develop a central tracking detector for an
%experimental
%search for the $\mu^+ \rightarrow e^+e^+e^-$ decay at the MuSIC, Research Center
%for Nuclear Physics (RCNP), Osaka University. The $\mu^+ \rightarrow e^+e^+e^-$
%decay is a charged lepton flavor
%violation (cFLV) process, which is forbidden process in the Standard Model.
%However, various extensions of the Standard Model predict that cFLV might occur
%at the rate that future experiments can reach. Current experimental upper limit
%(at confidence level of 90\%) for the branching ratio $\mu^+ \rightarrow
%e^+e^+e^-$ is $1.0 × 10−12$
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Methods}
{\Large
In order to carry out the experiment, two important items
are needed: a high-intensity muon beam; and a good tracking detector.
}
\subsection{The MuSIC facility}
\begin{center}
\includegraphics[width=27cm]{figs/music.eps}
\caption{Schematic view of the MuSIC}
\label{fig:schememusic}
\end{center}
%The goal of this experiment is to achieve a sensitivity of $1.0\times10^{-14}$,
%which means two orders of magnitude improvement from the current limit. To carry
%out a search for the $\mu^+ \rightarrow e^+e^+e^| $ process at such a
%sensitivity, a highly intense muon source is needed because the number of muons
%that would be usable for an experiment will determine the sensitivity. This high
%intensity source will be available at the MuSIC (Muon Science Innovative
%Channel), a newly installed beam line at RCNP (Research Center for Nuclear
%Physics), Osaka University.
{\Large
\begin{itemize}
\item MuSIC (\textbf{Mu}on \textbf{S}cience \textbf{I}nnovative
\textbf{C}hannel): a
newly installed beam line at RCNP, Osaka University.
\item The world most intense muon beam: $10^9$ muons/sec with 1 $\mu$A proton
beam current (400 MeV in energy)
\item Purpose: particle physics, nuclear physics, material science, \ldots
\item DC beam: important characteristic for the $\mu^+ \rightarrow e^+e^+e^- $
experiment, because it reduces accidental background.
\end{itemize}
}
\columnbreak
\subsection{The time projection chamber (TPC)}
{\Large
\begin{itemize}
\item Use for tracking charged particles ($e^- $ and $e^+$) which are products
of the $\mu^+ \rightarrow e^+e^+e^- $ event. The event signatures are: a)
$\Sigma p = 0$; b) $\Sigma E = m_\mu$; c) same vertex; d) same time.
\item GEM-TPC (figure below) is a good candidate, because:
\begin{itemize}
\item Event vertex can be reconstructed,
\item Can work at high count rate while maintaining high resolution
\cite{fabbi32}
\end{itemize}
% \item Advantages of GEM-TPC:
\end{itemize}
}
\begin{center}
\includegraphics[width=25cm]{figs/gemtpc.eps}
\caption{Illustration of a GEM-TPC (a); and GEM structure (b).}
\label{fig:gemtpc}
\end{center}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Plan\& Status}
\subsection{Plan}
{\Large
\noindent \textbf{The first step is simulation study:}
\begin{itemize}
% \setlength{\itemsep}{0pt}
\item Event generator
\item Geant4 simulation for the MuSIC beam line
\item Transportation of charged particles in the detector
% by Garfield simulation toolkit(\url{http://garfield.web.cern.ch/garfield/})
\textcolor{red}{$\rightarrow$} results will be used to design a prototype GEM-TPC.
\end{itemize}
%\vspace{-0.3cm}
\noindent \textbf{Next step is experiments:}
\begin{itemize}
\item A prototype TPC (20 cm $\times$ 10 cm) will be constructed,
\item Experiments to test its performance and optimize
\end{itemize}
}
\columnbreak
\subsection{Status}
{\Large
Currently, I have finished part of simulation study, that includes:
\begin{itemize}
\item An event generator to simulate $\mu^+ \rightarrow e^+e^+e^-$ events
based on different models. From this simulation, acceptance of the detector
can be predicted:
\begin{center}
\includegraphics[width=20cm]{figs/acceptance.eps}
\caption{Acceptance of the detector as a function of the momentum cut}
\label{fig:acceptance}
\end{center}
\item Simple model of the TPC to register the $\mu^+ \rightarrow e^+e^+e^-$
events, and an event reconstruction program has been developed:
\begin{center}
\includegraphics[width=20cm]{figs/tpc.eps}
\caption{Simple model of the TPC}
\label{fig:model}
\end{center}
\end{itemize}
Also, the prototype construction is subject to be funded.
}
%\centerline{\includegraphics[width=\linewidth]{figs/w81s_4poster.ps}}
%\centerline{ \textbf{Figure 5}: \textit{Results for field W81s (same format as
%Fig.~4).}}
%
%\vspace*{20mm}
%%% Try to align numbers; not perfect but works.
%\def\0{\hbox{\phantom{\footnotesize\rm 1}}}%. \def\tabcolsep{4mm}
%\begin{center} \begin{tabular}{cccccc} \hline field & \# ON & \# OFF & \don
% & \doff & soma \\
% %% & (\#) & (\#) & (\um) & (\um) & (\um) \\
% \hline W81s & 65 & 70 & $116 \pm 20$ \um & $130 \pm 25$ \um & \09
% \um\\ M623 & 74 & 82 & $100 \pm 13$ \um & $\090 \pm 15$ \um & 15 \um
% \\ \hline \end{tabular} \end{center}
%
%\vspace*{5mm}
%
%\textbf{Table~1}: \textit{Best-fit parameters of the \dmin model to the two
%datasets. \don\ and \doff: mean $\pm$ s.d. of homotypic exclusion zones; soma:
%diameter of heterotypic exclusion zone.}
%
\vspace*{-1cm}
\begin{thebibliography}{99}
\setlength{\itemsep}{-2mm}
% \bibitem{kunorev}Y. Kuno and Y. Okada, Review of Modern Physics
% (2001) 73 151-202
\bibitem{belgrade}U. Belgrade et al., Nuclear Physics B (1988) 299
1-6
\bibitem{fabbi32}L. Fabbietti et al., Nuclear Instruments and Methods in
Physics Research A 628 (2011) 204-208
% \bibitem{music}The MuSIC collaboration, The MuSIC Project under The
% Center of Excellence of Sub Atomic Physics (not published)
\end{thebibliography}
\end{document}
% LocalWords: RGCs