342 lines
15 KiB
TeX
342 lines
15 KiB
TeX
%==============================================================================
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%== template for LATEX poster =================================================
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%==============================================================================
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%
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%--A0 beamer slide-------------------------------------------------------------
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\documentclass[final]{beamer} % use beamer
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\usepackage[orientation=portrait,
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size=a0, % poster size
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scale=1.35 % font scale factor
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]{beamerposter} % beamer in poster size
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%
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%--some needed packages--------------------------------------------------------
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\usepackage[american]{babel} % language
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\usepackage[utf8]{inputenc} % std linux encoding
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\usepackage{booktabs}
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\usepackage{multirow}
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%
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%==The poster style============================================================
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\usetheme{cpbgposter} % our poster style
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%--set colors for blocks (without frame)---------------------------------------
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\setbeamercolor{block title}{fg=ngreen,bg=white}
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\setbeamercolor{block body}{fg=black,bg=white}
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%--set colors for alerted blocks (with frame)----------------------------------
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%--textcolor = fg, backgroundcolor = bg, dblue is the jacobs blue
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\setbeamercolor{block alerted title}{fg=white,bg=dblue!70}%frame color
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\setbeamercolor{block alerted body}{fg=black,bg=dblue!10}%body color
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%
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\usecaptiontemplate{
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\small
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\structure{\insertcaptionname~\insertcaptionnumber:}
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\insertcaption}
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%==Titel, date and authors of the poster=======================================
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%\title{Template for \LaTeX poster using the\\
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%Computational Physics and Biophysics Group style}
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%\title{Study of Muon Capture \\
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%for $\boldsymbol{\mu^--e^-}$ Conversion Experiments}
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\title{A Search for $\boldsymbol{\mu-e}$ Conversion \\
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\vskip0.5ex
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and a Study of Muon Capture Backgrounds}
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\author{Tran Hoai Nam}
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\institute{Department of Physics, Graduate School of Science, Osaka Univerity}
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\date{\today}
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%
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%==some usefull qm commands====================================================
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% |x>
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\newcommand{\ket}[1]{\left\vert#1\right\rangle}
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% <x|
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\newcommand{\bra}[1]{\left\langle#1\right\vert}
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% <x|y>
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\newcommand{\braket}[2]{\left< #1 \vphantom{#2}\,
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\right\vert\left.\!\vphantom{#1} #2 \right>}
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% <x|a|y>
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\newcommand{\sandwich}[3]{\left< #1 \vphantom{#2 #3} \right|
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#2 \left|\vphantom{#1 #2} #3 \right>}
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% d/dt
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\newcommand{\ddt}{\frac{d}{dt}}
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% D/Dx
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\newcommand{\pdd}[1]{\frac{\partial}{\partial#1}}
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% |x|
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\newcommand{\abs}[1]{\left\vert#1\right\vert}
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% k_{x}
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\newcommand{\kv}[1]{\mathbf{k}_{#1}}
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\newlength{\sepwid}
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\newlength{\onecolwid}
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\newlength{\twocolwid}
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\setlength{\sepwid}{0.04\paperwidth}
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\setlength{\onecolwid}{0.28\paperwidth}
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\setlength{\twocolwid}{0.60\paperwidth}
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%==============================================================================
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%==the poster content==========================================================
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%==============================================================================
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\begin{document}
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%--the poster is one beamer frame, so we have to start with:
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\begin{frame}[t]
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%--to seperate the poster in columns we can use the columns environment
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\begin{columns}[t] % the [t] options aligns the columns content at the top
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\begin{column}{0.28\paperwidth}% the right size for a 3-column layout
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%--abstract block--------------------------------------------------------
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\begin{block}{Introduction - Searches for cLFV}
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\begin{itemize}
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\item Charged lepton flavor violation (cLFV) is forbidden in the
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Standard Model. However, it is predicted to occur in various
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extensions of the model. Experimental observation
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of cLFV process is a clear evidence of new physics beyond the
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SM.
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%\ref{fig:SMmeg}).
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%\begin{figure}[h!]
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%\begin{center}
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%\includegraphics[width=0.8\onecolwid]{figs/SM-meg2}
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%\end{center}
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%\caption{One of the diagrams of massive neutrino contributions to
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%$\mu \rightarrow e\gamma$}
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%\label{fig:SMmeg}
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%\end{figure}
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\item Two major experiments are going to start to search for the
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cLFV \textcolor{red}{$\mu-e$ conversion}: COMET and Mu2e.
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%\vskip1ex
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=0.95\onecolwid]{figs/mueconv}
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\end{center}
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\caption{What and Why $\mu-e$ conversion}
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\label{fig:mueconv}
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\end{figure}
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\item The COMET stands for COherent Muon to Electron Transition.
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It has been approved by J-PARC in 2009 as experiment J-PARC E21.
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The experiment will search for $\mu-e$ conversion on aluminum
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target with a single-event sensitivity 10,000 times better
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than the current limit. The COMET uses staging approach with two
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phases \cite{loi}:
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\begin{itemize}
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\item [-] COMET Phase I (physics run in 2017): background study
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for Phase II, and search for $\mu-e$ conversion with a
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sensitivity of $\color{red}3.1\times10^{-15}$
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\item [-] COMET Phase II (physics run in 2019): search for
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$\mu-e$ conversion at a sensitivity of
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$\color{red}3\times10^{-17}$
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=0.95\onecolwid]{figs/cometscheme}
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\end{center}
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\caption{Schematic lay out of the COMET Phase I and COMET
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Phase II}
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\label{fig:cometscheme}
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\end{figure}
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\end{itemize}
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%\item Event signal of $\mu - e$ conversion: a single mono-energetic
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%electron at 105 MeV
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\item One issue of the experiment at Phase I: \textcolor{red}
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{hit rate on the tracking detectors}. In order to optimize the
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targets and the absorber, a study of charged particles,
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especially protons, emitted after muon capture is needed.
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\begin{figure}[h!]
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\centering
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\includegraphics[width=0.88\onecolwid]{figs/issue2}
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\caption{Concept of the tracking detectors}
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\label{fig:issue}
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\end{figure}
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\item There are \textcolor{red}{no experimental data}, in the
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\textcolor{red}{relevant energy range}, on the
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products of muon capture from \textcolor{red}{Al, and Ti target}.
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Both COMET and Mu2e are using extrapolated data from a
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measurement on an active Si target in 1968.
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\begin{figure}[h!]
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\includegraphics[width=0.85\onecolwid]{figs/si-proton}
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\caption{Charged particles spectrum after muon capture on
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Si$^{28}$ \cite{sidata}}
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\label{fig:sidata}
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\end{figure}
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\end{itemize}
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\end{block}
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%% The proton measurement experiment
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\end{column}
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%===rightcolumn=================================================================
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% here the the middle and right column are put into one big column, this allows
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% to change between 2 and 3 column style
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\begin{column}{0.60\paperwidth} %thats the big right column
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\begin{block}{The new measurement of charged particles emission
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from muon capture}
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\begin{itemize}
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\item A joint collaboration between COMET and Mu2e
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\item Goals of the experiment:
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\begin{itemize}
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\item[$\bullet$] measure \textcolor{red}{rate and energy
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spectra} of the charged
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particles (p, d, $\alpha$) emitted after muon capture on
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some targets:
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\begin{itemize}
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\item [-] Al: default target of COMET and Mu2e
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\item [-] Ti: possible target for future $\mu-e$
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conversion experiments
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\item [-] Si: active target, for cross-checking against
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previous experiment, and studying the energy loss of
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charged particles inside the targets
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\end{itemize}
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\item[$\bullet$] required precision: \textcolor{red}{5\%}
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for both the rate and the
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energy spectra in the range from 2.5 $-$ 12 MeV
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\end{itemize}
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\item Will be conducted at TRIUMF (Canada) and PSI
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(Switzerland).
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\end{itemize}
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\end{block}
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\vskip1ex
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% Methods
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\begin{block}{Methods}
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\begin{figure}[]
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\includegraphics[width=0.95\twocolwid]{figs/setupa}
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\caption{Experimental setup: schematic view (left) and image (right)}
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\label{fig:setup}
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\end{figure}
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\begin{minipage}[t]{\onecolwid}
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\begin{itemize}
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\item Low momentum muon beam: to ensure a high rate of stopped
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muons, and a well determined range of muons in the targets. A
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cloud muon of 30 $-$ 34 MeV/c from a surface muon channel is
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optimal.
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\item The charged particles are measured by dE/dx method
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by two pairs of silicon detectors. Active area of each silicon
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detector is 5$\times$5 cm$^2$, the dE detectors are 65 $\mu m$
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thick, and the E detectors are 1500 $\mu m$ thick.
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\end{itemize}
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\end{minipage} % Do not put another blank line after this line because
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%that will mess up the alignment of the two minipages
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\begin{minipage}[t]{\onecolwid}
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\begin{itemize}
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\item Muon normalization: muonic X-ray measurement by a germanium
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detector.
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\item Correction for energy loss of charged particles in the
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targets: using a response function obtained from the use of the
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active silicon target, where the energy loss can be measured. A
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waveform digitizer will be used to readout signals from the
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active target.
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\end{itemize}
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\end{minipage}
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\end{block}
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\vskip2ex
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%===two right columns===========================================================
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% we have to give the total width for the column wich is equal to the sum of
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% two colums and the space between them, this is needed to make shure the two
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% cols take all the space of the 'mother' column
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\begin{columns}[t,totalwidth=0.60\paperwidth]
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% and then we put in two normal sized columns
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\begin{column}{0.28\paperwidth}
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%--the Left block-----------------------------------------------------------
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\begin{block}{Calculations}
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\begin{itemize}
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\item Using Geant4, with assumptions:
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\begin{itemize}
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\item [$\bullet$] Muon momentum 30 MeV/c, momentum spread 5\%.
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\item [$\bullet$] Muon intensity: 10$^4$ muons/sec.
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\item [$\bullet$] Proton emission rate is 0.15 per muon capture,
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the same value as that is being used in COMET designing
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calculations
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\item [$\bullet$] Energy resolution (FWHM) of silicon detectors
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are: 140 keV for the 65 $\mu m$-thick detectors, and 40 keV for
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the 140 $\mu m$-thick detectors.
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\item [$\bullet$] Thickness of the beam counter scintillator: 0.5 mm
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\end{itemize}
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\item Simulation results of particle identification and rate
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estimation is shown in Figure \ref{fig:dEdx} and Table
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\ref{tb:rates}.
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\end{itemize}
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\vskip2ex
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\begin{figure}[]
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\includegraphics[width=0.95\onecolwid]{figs/dEdx}
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\caption{Particle identification with two silicon detectors}
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\label{fig:dEdx}
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\end{figure}
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\end{block}
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\end{column}
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%--the Right block--------------------------------------------------------------
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\begin{column}{\onecolwid}
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\begin{block}{Calculations (cont.)}
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\begin{table}[h!]
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\begin{center}
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\scalebox{0.75}{
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\begin{tabular}{cccc}
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\toprule
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Target & \% Stopping & Event rate (Hz) & Event rate (Hz) \\
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thickness ($\mu$m)& in target & All particles & Protons \\
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\midrule
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50 & 2 & 8.1 & 1.0 \\
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100 & 16 & 21.3 & 1.5 \\
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150 & 38 & 39.9 & 2.1 \\
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200 & 53 & 51.1 & 2.4 \\
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\bottomrule
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\end{tabular}
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}
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\end{center}
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\caption{Estimated event rates for various targets of different
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thickness. }
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\label{tb:rates}
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\end{table}
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\end{block}
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\vskip2ex
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\begin{block}{Plan}
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\begin{itemize}
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\item July 2012: submitted the proposal to TRIUMF as experiment
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S1371, requested 36 shifts (3 weeks) beam time
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\item September 2012: the proposal was accepted with high priority
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\item Late November 2012: beam test
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\item Early 2013: physics run, 36 shifts
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\item A proposal will be submitted to PSI
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\end{itemize}
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\end{block}
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\vskip2ex
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\begin{block}{References}
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\small{\begin{thebibliography}{99}
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%\bibitem{cdr} The COMET Collaboration, ``Conceptual Design Report for
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%Experimental Search for Lepton Flavor Violating $\mu^--e^-$
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%Conversion at
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%Sensitivity of $10^{-16}$ with a Slow-Extracted Bunched Proton Beam
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%(COMET)'', KEK-2009-10
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\bibitem{loi} The COMET Collaboration, ``Letter of Intent for Phase-I
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of the COMET Experiment at J-PARC'', J-PARC-2012-3
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\bibitem{sidata} S. E. Sobottka and E. L. Wills, ``Energy Spectrum
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of Charged Particles Emitted Following Muon Capture in Si$^{28}$'',
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Phys. Rev. Lett. \textbf{20} (1968) 596-598.
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\end{thebibliography}}
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\end{block}
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\end{column}
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\end{columns}
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%--wide text without block------------------------------------------------------
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%Those pictures where drawn with the TikZ package, which is a perfect tool if
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%you want to draw pictures or plot functions or data directly in \LaTeX. To
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%get an impression of the possibilities of this package have a look at its
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%manual \cite{pgf}. It is even possible to wonderfull frames around posters.
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%\vskip2ex
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\vskip3ex
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%--Conclusion block-------------------------------------------------------------
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% \begin{alertblock}{Conclusion}
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% As you can see it is possible to make your poster very colorfull. But in
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% most cases this will this will overload your poster. If you don't change
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% the color settings you will get the default look, which consits of some
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% shades of the jacobs blue and some decent green highlights. These colors
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% where chosen carefully to keep a consistent look of the poster. The
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% \emph{cpbgposter} style is installed our office computers, so you should be
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% able to compile this example out of the box with pdflatex. If you want to
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% work on your computer make sure that you have a recent TeX distribution
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% (TeXlive 2008, Miktex) and download the beamerthemecpbgposter.sty file from
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% our teamwork page and put it in your local TeX directory.
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%
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% If you have any questions, critics, ideas or if you just want to praise the
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% awesome dude who created this insanely great poster style then don't
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% hastitate to write an email to \emph{j.liebers@jacobs-university.de}
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%% guess what this command is god for!
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% \makeruleinbox
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%% it works, but causes some underfull/overfull \hbox warnings
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% \begin{center}
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% {\huge\vskip-1ex
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% {\color{nred}H}{\color{norange}a}{\color{nyellow}p}
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% {\color{ngreen}p}{\color{dblue}y}\\
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% \TeX'ing!}
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% \end{center}
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% \end{alertblock}
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\end{column}
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\end{columns}
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\end{frame}
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\end{document}
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