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Nam Tran
2022-03-26 19:19:19 -05:00
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r15a_xray/tex/intro.tex
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\section{Introduction}
The next generation of charged leption flavor violation (CLFV) experiments
(COMET at J-PARC and Mu2e at Fermilab) are going to stop about \num{e18} muons
in their targets to search for new physics beyond the Standard Model. Knowing
accurately number of stopped muons in the targets is important as it is the
denominator for the branching ratio of the coherent muon decay to electron
without a neutrino process these experiments looking for. The proposed way to
measure the actual number of stopped muons is infering that from number of
charateristic muonic X-rays, and gamma rays emitted from excited nuclei after
muon capture.
The next generation of charged leption flavor violation (CLFV) experiments,
COMET at J-PARC and Mu2e at Fermilab, are going to stop about \num{e18} muons
in their targets to search for new physics beyond the Standard Model.
Knowing accurately number of stopped muons in the targets is important as it is
the denominator for the branching ratio of the CLFV process these experiments
are looking for. The proposed way to determine the number of stopped muons
is measuring the numbers of charateristic muonic X-rays, and gamma rays
emitted from cascading muons, and excited nuclei after muon capture,
respectively.
Both COMET and Mu2e will use pulsed proton beam to produce pions which decay in
flight to muons. The primary beam line of Mu2e would deliver proton pulses
@@ -25,15 +25,15 @@ titanium. Most prominent aluminum muonic X-rays at \SI{346.8}{\keV}
(\twoPoneS~transition) and \SI{412.8}{\keV} (\threePoneS~transition) were
measured precisely by Measday et
al.~\cite{Measday2007}. Observing these X-rays in a highly intense pulsed beam
experiment like COMET and Mu2e would be difficult as they might be buried by
the ``beam~flash'' described above. A gamma ray of \SI{1808.7}{\keV} from
experiment like COMET and Mu2e will be difficult as they might be buried by
the ``beam~flash''. A gamma ray of \SI{1808.7}{\keV} from
\ce{^{26}Mg^*} would provide a better proxy to the number of stopped muons for
it has a lifetime of muon in aluminium, therefore can be measured out of the
``beam flash''. The emission rate of this gamma was measured at
``beam~flash''. The emission rate of this gamma was measured at
\SI{10}{\percent} uncertainty in~\cite{Measday2007}.
Knowledge about muonic X-rays and gammas after muon capture on titanium is less
prehensive. Measurements of titanium were mostly done in context of either nuclear
comprehensive. Measurements of titanium were mostly done in context of either nuclear
charge radii~\cite{Wohlfahrt1981}, or neutrinoless double beta
decay~\cite{Zinatulina2019}, and did not report X-ray yeilds.
@@ -43,4 +43,3 @@ are emission rates of charateristic muonic X-rays from titanium, and improvement
on the rate of the \SI{1808.7}{\keV} gamma from aluminum. In addion, we have
measured photons from other materials where muons would stop in the experiments
to learn about potential background around the gammas and X-rays of interest.