363 lines
16 KiB
TeX
363 lines
16 KiB
TeX
%==============================================================================
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%== template for LATEX poster =================================================
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%==============================================================================
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%
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%--custom beamer slide-------------------------------------------------------------
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\documentclass[final]{beamer} % use beamer
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\usepackage[orientation=portrait,
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size=custom, % poster size
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width=90,height=180,
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scale=1.58 % 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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\usepackage{setspace}
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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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\vskip1.0ex
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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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\newcommand{\muec}{$\mu^{-} N \rightarrow e^{-} N$~}
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\newcommand{\mueg}{$\mu^{+} \rightarrow e^{+}\gamma$~}
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\newcommand{\meee}{$\mu \rightarrow eee$~}
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\newcommand{\muenn}{$\mu \rightarrow e \nu \overline{\nu}$~}
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\newcommand{\muenng}{$\mu \rightarrow e \nu \overline{\nu} \gamma$~}
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%\setbeamertemplate{itemize item}{\textbf{\ding{192}}}
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\setbeamertemplate{itemize item}{$\bullet$}
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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} \itemsep1pt \parskip1ex \parsep0pt
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\item Charged lepton flavor violation (cLFV) is forbidden
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in the Standard Model (SM). However, it is predicted to occur in
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various 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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cLFV $\mu \rightarrow e\gamma$}
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\label{fig:SMmeg}
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\end{figure}
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\item Muon capture on nucleus:
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\begin{itemize}\parskip1ex \parsep0pt
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\item Normal decays:
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=0.85\onecolwid]{figs/normdecays}
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\end{center}
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\caption{Fate of captured muons in SM}
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\label{fig:normdecays}
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\end{figure}
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\item \textcolor{red}{Beyond the SM:}
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neutrino-less muon decay or $\mu - e$
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conversion, lepton flavor violation by one unit:
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\[\mu^{-} N \rightarrow e^{-} N \]
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\end{itemize}
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\item Current upper limit, set by SINDRUM II ~\cite{sindrum}:
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\[
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Br(\mu^-+Au \rightarrow e^-+ Au)<7\times 10^{-13}
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\]
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Two new experiments are going to start to search for the
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cLFV $\mu-e$ conversion on aluminum target: COMET at J-PARC
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~\cite{cdr} and Mu2e at Fermilab. Both projects are now optimizing
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parameters to get the final design.
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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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\vskip2ex
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=0.95\onecolwid]{figs/cometphase1}
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\end{center}
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\caption{Schematic lay out of the COMET Phase I}
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\label{fig:cometphase1}
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\end{figure}
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\vskip5ex
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\begin{figure}[h!]
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\begin{center}
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\includegraphics[width=0.95\onecolwid]{figs/cometfull}
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\end{center}
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\caption{COMET at completion}
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\label{fig:cometfull}
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\end{figure}
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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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\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}{Proton background of the COMET Phase I and Mu2e}
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\begin{itemize}
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\item \textcolor{red}{Background from protons} could cause
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a very high hit rate on the tracking detectors.
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\begin{figure}[h!]
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\centering
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\includegraphics[width=0.88\twocolwid]{figs/issue2}
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\caption{Concept of the COMET Phase I tracking detectors}
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\label{fig:issue}
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\end{figure}
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\end{itemize}
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%\begin{itemize}
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\begin{minipage}[t]{\onecolwid}
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\begin{itemize}
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\item Currently, there are \textcolor{red}{no experimental
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data}, in the relevant energy range, on the
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products of muon capture from 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 for detectors
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design calculations.
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\end{itemize}
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\end{minipage}
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\begin{minipage}[t]{\onecolwid}
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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{minipage}
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\end{block}
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\begin{block}{New measurement of charged particles from muon capture}
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\begin{itemize}\itemsep1pt \parskip1ex \parsep0pt
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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 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: Al, Ti and Si
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\item 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=0.85\twocolwid]{figs/setupa}
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\caption{Experimental setup: schematic view (left) and actual
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photo (right)}
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\label{fig:setup}
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\end{figure}
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\vskip-3ex
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\begin{minipage}[t]{\onecolwid}
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\begin{itemize}\itemsep1pt \parskip1ex \parsep0pt
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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 Muon normalization: muonic X-ray measurement by
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a germanium detector.
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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}\itemsep1pt \parskip1ex \parsep0pt
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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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\item Correction for energy loss of charged particles in the
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targets: using the active silicon 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}\itemsep1pt \parskip1ex \parsep0pt
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\item Using Geant4, with assumptions:
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\begin{itemize}\itemsep1pt \parskip1ex \parsep0pt
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\item Muon: $p = 30 MeV/c$, $\Delta p/p = 5\%$,
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$10^4$ muons/sec
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\item Proton emission rate: 0.15 per muon capture,
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the same value as that is being used in COMET
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designing calculations
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\item Energy resolution (FWHM) of silicon detectors
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are: 140 keV for the 65 $\mu m$-thick detectors, and
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40 keV for the 140 $\mu m$-thick detectors.
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%\item 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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\vskip3ex
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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}\itemsep1pt \parskip1ex \parsep0pt
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\item September 2012: proposal to TRIUMF was accepted as
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experiment S1371, 3 weeks beam time
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%\item Late November 2012: beam test
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\item December 2012: a proposal will be submitted to PSI
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\item Early 2013: TRIUMF run, 36 shifts
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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{sindrum} Burtl W et al. (The SINDRUM II Collaboration),
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\textit{Eur. Phys. J. C} \textbf{47} (2006) 337
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\bibitem{cdr} The COMET Collaboration, ``Conceptual Design
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Report'' (CDR) , KEK-2009-10
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\bibitem{loi} The COMET Collaboration, ``Letter of Intent
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for Phase-I of the COMET Experiment at J-PARC'',
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J-PARC-2012-3
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\bibitem{sidata} S. E. Sobottka and E. L. Wills,
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\textit{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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%--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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