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AlCapPSI/Cover.tex

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+
+\vspace{.0cm}
+{\raggedleft December 10, 2012 \\
+\par}
+\vspace{.5cm}
+\begin{center}  
+
+{\bf\LARGE Study of Muon Capture for\\\vspace{2mm}
+ Muon to Electron  Conversion Experiments}
+\vspace{.5cm}
+
+\Large
+AlCap Collaboration
+\vspace{1.5cm}
+
+
+%% ML - move this figure to the Intrduction
+% \begin{figure}[h]
+% %\vspace{-40mm}
+% \includegraphics[width=\textwidth]{figs/comet-mu2e.png}
+% \caption{Schematic layouts of the Mu2e (left) and the COMET (right).}
+% \label{fg:mu2ecomet}
+% %\vspace{-5mm}
+% \end{figure}
+% \vspace{10mm}
+
+\end{center}
+
+\begin{center}
+%{\tt Preliminary version, final proposal will be uploaded on 12/14/2012}
+
+%{\bf institutional representatives, please check and update}
+\vspace{5mm}
+
+D. Alexander\uh,
+D.M. Asner\pnnl,
+E. Barnes\bu,	 
+R. Bernstein\fnal,	 
+R. Bonicalzi\pnnl,
+A. Daniel\uh,
+A. Edmonds\ucl,
+A. Empl\uh, 
+D. Hertzog\uw,	 
+Y. Hino\osaka,	 
+E. Hungerford\uh,
+T. Itahashi\osaka,	 
+D. Kawall\umass,	 
+A. Kolakar\bu,	 
+B. Krikler\icl,	
+\underline{P. Kammel\uw},
+K. Kumar\umass,	
+\underline{Y. Kuno\osaka},
+A. Kurup\icl, 
+M. Lancaster\ucl,
+J. Miller\bu,	 
+M. Murray\uw,	 
+T.H. Nam\osaka,	 
+V. Ruso\fnal,	 
+H. Sakamoto\osaka,	 
+A. Sato\osaka,	
+M. Schram\pnnl,
+Y. Uchida\icl,	
+G. Warren\pnnl,
+F. Wauters\uw,
+P. Winter\anl,	 
+M. Wing\ucl,
+L. Wood\pnnl
+
+
+\vspace{10mm}
+ 
+\anl Argonne National Laboratory, Illinois (ANL)
+
+\bu Boston University, Boston, Massachusetts (BU)
+
+\fnal Fermilab National Accelerator Laboratory, Batavia, Illinois (FNAL)
+
+\uh University of Houston, Houston, Texas (UH)
+
+\icl Imperial College, London, UK (ICL)
+
+\umass University of Massachusetts, Amhurst, Massachusetts (UMass)
+
+\osaka Osaka University, Osaka, Japan (OU)
+
+\pnnl Pacific Northwest National Laboratory, Richland, Washington (PNNL)
+
+\ucl University College London, London, UK (UCL)
+
+\uw University of Washington, Seattle, Washington (UW)
+
+\vspace{15mm}
+Co-spokespersons underlined.
+
+\end{center}
+
+\newpage
+
+\vspace{2cm}
+\begin{center}
+{\bf Abstract}
+\end{center}
+The recent observation that neutrinos oscillate, change flavour, and so have
+mass, requires an extension to the Standard Model (SM) and
+demonstrates that lepton flavour is 
+not an absolutely conserved quantity. However, even when accommodating
+finite neutrino mass in a minimal extension
+to the SM, the rate of charged lepton flavour
+violating (CLFV) interactions is predicted to be far too
+small to be observed, ${\cal{O}}(10^{-50})$. Thus, any experimental 
+observation of CLFV would be clear evidence of new physics beyond the SM.
+
+Two new projects will search for the CLFV in 
+\muec conversion. They are the Mu2e experiment at FNAL and the
+COMET experiment at J-PARC. Both experiments utilise multi-kW
+pulsed 8$-$9 GeV proton beams to achieve a branching ratio sensitivity lower
+than 10$^{-16}$, that is 10,000 times better than the current best
+limit established by SINDRUM II.  
+
+Both COMET Phase-I and Mu2e are subject to significant backgrounds
+from the products from muon (and pion) nuclear capture. The
+goals of  this joint proposal between both Mu2e and COMET
+collaborations are precision measurements of muon
+capture reactions in candidate targets, at levels required
+for the design and optimization of this new generation of experiments.
+
+The initial focus of this proposal is on the measurement of low energy
+charged particles after muon capture on a nucleus.  This process 
+constitutes a severe background, and has inadequate
+experimental information available. X-rays and
+gamma-rays will be also observed, in order to verify that this
+technique can be used to determine the number of $\mu$ captures in a
+$\mu \to e$ experiment, and to
+normalize the proposed capture measurements. Finally we propose to
+study both neutron emission after $\mu$ capture and radiative decay of
+the $\mu$ in the nuclear environment as these also provide crucial
+information to be used in the design and simulation of the experiments.\\
+
+PSI beam quality is critical to provide a pure, low-energy muon beam
+with a small momentum spread. This is especially important for 
+charged-particle emission measurements, as thin targets of 
+aluminum, silicon and titanium are required so that the emitted 
+particles penetrate the targets with minimal energy loss. 
+This was a major problem in previous experiments and has prevented the
+extraction of low-energy spectra. 
+
+\newpage