Muon g−2/EDM Measurement with a New Approach at the J-PARC

Abstract

The muon anomalous magnetic moment (g−2) and the electric dipole moment (EDM) are hot topics in particle physics. There is a significant discrepancy between measurements and theoretical calculations of the muon g−2. The muon EDM violates CP symmetry if CPT symmetry is assumed to be conserved, and it is one of the most sensitive probes to new physics beyond the Standard Model of particle physics. The muon g−2/EDM can be measured using spin precession of muons in a storage ring. At the J-PARC muon facility, we are going to measure the muon g−2/EDM with a new approach using a novel low-emittance muon beam, which is generated by re-accelerating ultra-slow muons (25 meV) to 212 MeV. In this paper, we briefly explain the muon g−2/EDM and the experimental method to measure them, and then the details of the J-PARC experiment is described.