J-PARC muon g − 2/EDM experiment

The muon anomalous magnetic moment (g − 2)_µ and the electric dipole moment are sensitive to new physics beyond the Standard Model (SM). There is a discrepancy between the (g − 2)_µ measured by the E821 collaboration at Brookhaven National Laboratory (BNL) and the SM prediction at the more than 3σ level. This may imply a presence of new physics, therefore, precision measurements of the muon anomaly with an independent method are crucial. We aim to measure (g−2)_µ with a precision of 450 parts per billion and to search for the electric dipole moment with a sensitivity of 1.5×10⁻²¹e·cm in the initial phase with a method different from the E821 at BNL and E989 at Fermilab experiments. To reach the target precision, we utilize a high-intensity proton beam at J-PARC and newly developed technique of reaccelerated thermal muon beam, which is produced by thermal muonium production followed by laser ionization and linear acceleration. We report experimental approaches, current status of each component of our experiment, and future prospects. (author)