Measurement of hyperfine splitting of the ground state of muonium atom

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Muonium atom is a unique probe to verify the consistency of the standard model in very high precision and/or to investigate new physics beyond the standard model, because it is made of only leptons which do not have internal structures. We aim to realize a new experiment which aims to improve the accuracy of the measurement of hyperfine splitting of the ground state of muonium atom by an order of magnitude at J-PARC MLF. We have developed a RF cavity which has two resonance frequencies which can be independently tuned with two tuning bars, a gas chamber which holds Kr gas for three months with less than 1ppm impurity, positron detectors which can cope with high counting rate under 1T magnetic field, and a NMR system which can measure magnetic field with accuracy better than 1ppm.