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EDIT2013poster/contents.tex
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\begin{column}{0.28\paperwidth}% the right size for a 3-column layout
%--abstract block--------------------------------------------------------
\begin{alertblock}{Introduction}
Charged lepton flavor violation (CLFV) has attracted much attention
from experimentalists and theorists in particle physics. The CLFV rates
are predicted to be in the order of of O($10^{-54}$) in the Standard
Model.
Therefore, any observation of CLFV processes would be an
unambiguous signal for physics beyond the Standard Model. The COMET is
an experiment that aims to search for a CLFV process of
muon-to-electron conversion in the presence of a nucleus, \muec. Using
the J-PARC proton beam and the pion capture by a solenoidal
field, COMET expects to have a sensitivity a factor of 10,000 times
that of the current limit. The COMET experiment has taken a phased
approach in which the COMET Phase-I (first phase) will start its
construction in 2013 and initial data taking in around 2016. Some more
details of COMET Phase-I and its related issues will be presented.
Charged lepton flavor violation (cLFV) has yet to be observed and is
known to be sensitive to new physics beyond the Standard Model (SM).
Various extensions of the SM predicts that cLFV occurs at a detectable
branching ratio. Therefore, from experimental point of view, it is
attractive to search for cLFV with more powerful beams and better
detection technologies.
Among the cLFV processes, $\mu-e$ conversion, a coherent neutrino-less
conversion of muon to electron in the presence of a nucleus: \muecaz,
is our interest. We have proposed a new search for $\mu -e$ conversion
at J-PARC, the E21 experiment - \textcolor{red}{COMET}(
\textcolor{red}{COherent Muon to Electron Transition}). The single
event sensitivity (SES) of COMET will be $2.6\times10^{-17}$, which is
10,000
times better than that of the current experimental limit
set by SINDRUM II at $7\times10^{-13}$.
\end{alertblock}
\begin{alertblock}{Staging approach of the COMET}
The proposed J-PARC mid-term plan includes the construction of the
COMET beamline. This will provide the proton beamline for COMET and
part of the muon beamline in the south area of the J-PARC Hadron
Experimental Hall. We consider a staged approach for COMET: “COMET
Phase-I” and “COMET Phase-II”.
In order to realize the COMET experiment, a two-stage approach has been
taken. COMET Phase-I aims at an intermediate SES of $3\times10^{-15}$,
which is an improvement of a factor of 100 compares to SINDRUM II. In
addition, the COMET Phase-I will make direct measurement of the proton
beam extinction and other potential background sources for the COMET
Phase-II experiment, using the actual COMET beamline.
For the COMET Phase-I, we will construct the first 90 degrees of the
muon beamline so that a muon beam can be extracted to the experimental
area. Then, we will:
1) make a direct measurement of the proton beam extinction and other
potential back- ground sources for the COMET Phase-II ex- periment,
using the actual COMET beamline, and
2) carry out a search for e conversion with a singe-event
sensitivity (S.E.S.) of 3 1015, which is better than achieved
by SINDRUM-II.
After these measurements, the muon transport will be extended up
to 180 degrees for the COMET Phase-II. We will start the e
conversion search with S.E.S. of 3 1017 sensitivity with an
electron spectrometer and detectors
\begin{figure}[h!]
\begin{center}
\includegraphics[width=0.95\onecolwid]{figs/cometfull}
\includegraphics[width=0.95\onecolwid]{../figs/comet/comet_phase_1}
\end{center}
\caption{Schematic lay out of the COMET Phase I and COMET
Phase II}
\caption{Schematic layout of the COMET}
\label{fig:cometscheme}
\end{figure}
The COMET Phase-I funding has been approved. Experimental hall
construction and beam
line design are in progress, and expected to finish in 2015. The layout
of the COMET beam line at Hadron Hall, J-PARC is shown in the Fig.
\ref{fig:cometbeamline}. For the COMET Phase-I, we will
construct the first 90 degrees of the muon beamline before extracting
to the experimental area. Data taking is expected to start around 2016.
\begin{figure}[h!]
\begin{center}
\includegraphics[width=0.95\onecolwid]{figs/cometphase1}
\includegraphics[width=0.95\onecolwid]{../figs/comet/comet_beamline}
\end{center}
\caption{Schematic lay out of the COMET Phase I and COMET
Phase II}
\label{fig:cometp1}
\caption{COMET beam line at Hadron hall}
\label{fig:cometbeamline}
\end{figure}
\end{alertblock}
\end{column}
%===rightcolumn=================================================================
% here the the middle and right column are put into one big column, this allows
% to change between 2 and 3 column style
\begin{column}{0.60\paperwidth} %thats the big right column
\begin{block}{The new measurement of charged particles emission
from muon capture}
\begin{itemize}
\item A joint collaboration between COMET and Mu2e
\item Goals of the experiment:
\begin{itemize}
\item[$\bullet$] measure \textcolor{red}{rate and energy
spectra} of the charged
particles (p, d, $\alpha$) emitted after muon capture on
some targets:
\begin{itemize}
\item [-] Al: default target of COMET and Mu2e
\item [-] Ti: possible target for future $\mu-e$
conversion experiments
\item [-] Si: active target, for cross-checking against
previous experiment, and studying the energy loss of
charged particles inside the targets
\end{itemize}
\item[$\bullet$] required precision: \textcolor{red}{5\%}
for both the rate and the
energy spectra in the range from 2.5 $-$ 12 MeV
\end{itemize}
\item Will be conducted at TRIUMF (Canada) and PSI
(Switzerland).
\end{itemize}
\end{block}
\vskip1ex
% Methods
\begin{block}{Methods}
\begin{figure}[]
\includegraphics[width=0.95\twocolwid]{figs/setupa}
\caption{Experimental setup: schematic view (left) and image (right)}
\label{fig:setup}
\end{figure}
\begin{minipage}[t]{\onecolwid}
\begin{itemize}
\item Low momentum muon beam: to ensure a high rate of stopped
muons, and a well determined range of muons in the targets. A
cloud muon of 30 $-$ 34 MeV/c from a surface muon channel is
optimal.
\item The charged particles are measured by dE/dx method
by two pairs of silicon detectors. Active area of each silicon
detector is 5$\times$5 cm$^2$, the dE detectors are 65 $\mu m$
thick, and the E detectors are 1500 $\mu m$ thick.
\end{itemize}
\end{minipage} % Do not put another blank line after this line because
%that will mess up the alignment of the two minipages
\begin{minipage}[t]{\onecolwid}
\begin{itemize}
\item Muon normalization: muonic X-ray measurement by a germanium
detector.
\item Correction for energy loss of charged particles in the
targets: using a response function obtained from the use of the
active silicon target, where the energy loss can be measured. A
waveform digitizer will be used to readout signals from the
active target.
\end{itemize}
\end{minipage}
\end{block}
\vskip2ex
%\begin{block}{}
%===two right columns===========================================================
% we have to give the total width for the column wich is equal to the sum of
% two colums and the space between them, this is needed to make shure the two
% cols take all the space of the 'mother' column
\begin{columns}[t,totalwidth=0.60\paperwidth]
% and then we put in two normal sized columns
\begin{column}{0.28\paperwidth}
%--the Left block-----------------------------------------------------------
\begin{block}{Calculations}
\begin{itemize}
\item Using Geant4, with assumptions:
\begin{itemize}
\item [$\bullet$] Muon momentum 30 MeV/c, momentum spread 5\%.
\item [$\bullet$] Muon intensity: 10$^4$ muons/sec.
\item [$\bullet$] Proton emission rate is 0.15 per muon capture,
the same value as that is being used in COMET designing
calculations
\item [$\bullet$] Energy resolution (FWHM) of silicon detectors
are: 140 keV for the 65 $\mu m$-thick detectors, and 40 keV for
the 140 $\mu m$-thick detectors.
\item [$\bullet$] Thickness of the beam counter scintillator: 0.5 mm
\end{itemize}
\item Simulation results of particle identification and rate
estimation is shown in Figure \ref{fig:dEdx} and Table
\ref{tb:rates}.
\end{itemize}
\vskip2ex
\begin{figure}[]
\includegraphics[width=0.95\onecolwid]{figs/dEdx}
\caption{Particle identification with two silicon detectors}
\label{fig:dEdx}
\end{figure}
%\begin{columns}[t,totalwidth=0.60\paperwidth]
% and then we put in two normal sized columns
\begin{column}{0.28\paperwidth}
\begin{alertblock}{Proton beam}
COMET Phase-I will use an 8 GeV, 1 $\mu$A, slowly extracted proton beam
from the J-PARC main ring (MR). One option for the bunch structure of
the proton beam is shown in Fig \ref{fig:pbeam}.
\begin{figure}[]
\includegraphics[width=0.75\onecolwid]{../figs/comet/comet_pbeam_config}
\caption{COMET proton beam acceleration bunch configuration}
\label{fig:pbeam}
\end{figure}
\end{alertblock}
%--the Left block-----------------------------------------------------------
\begin{alertblock}{Pion and muon transportation beam}
\begin{figure}[]
\includegraphics[width=0.95\onecolwid]{../figs/comet/comet_p1_det_bg}
\caption{COMET proton beam acceleration bunch configuration}
\label{fig:bg_det}
\end{figure}
\end{alertblock}
%\end{block}
\vskip1ex
% Methods
\vskip2ex
\end{column}
%--the Right block--------------------------------------------------------------
\begin{column}{\onecolwid}
\begin{alertblock}{Detectors for COMET Phase I}
\end{alertblock}
\vskip2ex
\begin{alertblock}{}
\begin{figure}[]
\includegraphics[width=0.95\onecolwid]{../figs/comet/comet_p1_det_bg}
\caption{COMET proton beam acceleration bunch configuration}
\label{fig:phys_det}
\end{figure}
\end{alertblock}
\vskip2ex
\begin{block}{References}
\small{\begin{thebibliography}{99}
%\bibitem{cdr} The COMET Collaboration, ``Conceptual Design Report for
%Experimental Search for Lepton Flavor Violating $\mu^--e^-$
%Conversion at
%Sensitivity of $10^{-16}$ with a Slow-Extracted Bunched Proton Beam
%(COMET)'', KEK-2009-10
\bibitem{loi} The COMET Collaboration, ``Letter of Intent for Phase-I
of the COMET Experiment at J-PARC'', J-PARC-2012-3
\end{thebibliography}}
\end{block}
\end{column}
%--the Right block--------------------------------------------------------------
\begin{column}{\onecolwid}
\begin{alertblock}{Proton beam}
\end{alertblock}
\vskip2ex
\begin{block}{Plan}
\begin{itemize}
\item July 2012: submitted the proposal to TRIUMF as experiment
S1371, requested 36 shifts (3 weeks) beam time
\item September 2012: the proposal was accepted with high priority
\item Late November 2012: beam test
\item Early 2013: physics run, 36 shifts
\item A proposal will be submitted to PSI
\end{itemize}
\end{block}
\vskip2ex
\begin{block}{References}
\small{\begin{thebibliography}{99}
%\bibitem{cdr} The COMET Collaboration, ``Conceptual Design Report for
%Experimental Search for Lepton Flavor Violating $\mu^--e^-$
%Conversion at
%Sensitivity of $10^{-16}$ with a Slow-Extracted Bunched Proton Beam
%(COMET)'', KEK-2009-10
\bibitem{loi} The COMET Collaboration, ``Letter of Intent for Phase-I
of the COMET Experiment at J-PARC'', J-PARC-2012-3
\bibitem{sidata} S. E. Sobottka and E. L. Wills, ``Energy Spectrum
of Charged Particles Emitted Following Muon Capture in Si$^{28}$'',
Phys. Rev. Lett. \textbf{20} (1968) 596-598.
\end{thebibliography}}
\end{block}
\end{column}
\end{columns}
\begin{figure}[h!]
\begin{center}
\includegraphics[width=0.95\twocolwid]{../figs/comet/comet_phase1_tracker.pdf}
\end{center}
\caption{Schematic lay out of the COMET Phase I}
\label{fig:phase1}
\end{figure}
%\end{columns}
%--wide text without block------------------------------------------------------
%Those pictures where drawn with the TikZ package, which is a perfect tool if
%you want to draw pictures or plot functions or data directly in \LaTeX. To

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EDIT2013poster/poster.tex
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@@ -77,6 +77,7 @@
\newcommand{\muenn}{$\mu \rightarrow e \nu \overline{\nu}$~}
\newcommand{\muenng}{$\mu \rightarrow e \nu \overline{\nu} \gamma$~}
\newcommand{\muec}{$\mu^{-} N \rightarrow e^{-} N$~}
\newcommand{\muecaz}{$\mu^{-} + N(A,Z) \rightarrow e^{-} + N(A,Z)$~}
\begin{document}
\include{contents}

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