$\mu$-$e$ conversion experiments at J-PARC

TL;DR

This paper discusses two upcoming experiments at J-PARC, DeeMe and COMET, designed to detect muon to electron conversion, a process forbidden in the Standard Model but predicted by theories beyond it, with high sensitivity.

Contribution

It presents the current status and experimental plans of the DeeMe and COMET experiments for $$ conversion search at J-PARC.

Findings

DeeMe aims for a sensitivity of 1×10^{-13} with a carbon target.

COMET Phase-I targets a sensitivity of 3×10^{-15}.

Both experiments are progressing towards detecting charged lepton flavor violation.

Abstract

There are two plans of experiments to search for muon to electron ($\mu$-$e$) conversion at J-PARC, which are called DeeMe and COMET. The $\mu$-$e$ conversion is one of the charged lepton flavor violation processes. The processes are forbidden in the Standard Model, but some theories beyond the Standard Model predict relatively large branching ratios at orders of $10^{-12}$ to $10^{-17}$. DeeMe will be conducted with a sensitivity of $1\times10^{-13}$ using a carbon target for 1 year, and COMET will be done with that of $3\times10^{-15}$ in Phase-I. In this article, the current status of these two experiments will be presented.