Precise Measurement of Anomalous Magnetic Moment of Muon

Abstract

Muon is one of elementary particles, called lepton, with spin 1/2. Muon's spin interacts with magnetic and electric fields through its dipole moments. The anomalous magnetic (dipole) moment is calculated in the theory of particle physics, called the standard model, with a precision better than 0.5 parts-per-million. The past experiment indicated that the measured anomalous magnetic moment of muon is larger than the theoretical prediction. There has been a long-standing discussion that this anomaly might be a signature of new physics beyond the standard model. A new experiment with a novel technique of accelerating cold muon beam is under preparation in Japan. In this article, a concise review of anomalous magnetic moment of muon is given.