Abstract
There are two plans of experiments to search for muon to electron (\muμ-ee) conversion at J-PARC, which are called DeeMe and COMET. \muμ-ee conversion is one of the charged lepton flavor violation processes, which are forbidden in the Standard Model, but some theories beyond the Standard Model predict relatively large branching ratios at orders of 10^{-12}10−12 to 10^{-17}10−17. DeeMe will be conducted with a sensitivity of 1\times10^{-13}1×10−13 using a carbon target for 1 year, and COMET will be done with that of 3\times10^{-15}3×10−15 in Phase-I. In this article, the current status of these two experiments will be presented.
Highlights
1.1 Reactions of Muonic Atoms and μ-e ConversionIn the μ-e conversion search experiments, we stop negative muons in a target to form muonic atoms
If we change the target to silicon carbide, the sensitivity improves to be approximately 2×10−14
There are two plans of experiments to search for the μ-e conversion at J-PARC, which are called DeeMe and COMET
Summary
In the μ-e conversion search experiments, we stop negative muons in a target to form muonic atoms. The muon of 1S bound state in a muonic atom can decay, called the decay-in-orbit, or be captured by the nucleus through the charged-current weak interaction of the Standard Model. The probabilities of those processes depend on the nuclear mass. For muonic carbon atoms, which the DeeMe experiment plans to use, 92% of muons decay in orbit, while 8% of them are captured by the nucleus. The conversion electron is monoenergetic with an energy equal to the muon mass minus the binding energy of the muon and the nuclear recoil It will be approximately 105 MeV for the target atom made of carbon, aluminum or silicon
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