Anomalous Magnetic Moment

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The magnetic moment of spin-1/2 fermion with mass m and charge e is predicted as μ= e/ 2 m from the Dirac equation. The fermion precesses in magnetic field (B) with angular velocity ωp= eB/ m due to the magnetic moment. On the other hand, the cyclotron frequency of the fermion moving in the same magnetic field is ωc= eB/ m. Since ωc= ωp, the helicity (spin component of the momentum direction) of the fermion conserves in any magnetic field. However, it is observed that there is actually a slight difference between ωc and ωp. The origin of the difference is that the higher order diagrams add very small spin-flipping transition amplitude to the original one and change ωp. This effect is important because we can look new physics out through the additional transition amplitude.

Original languageEnglish
Title of host publicationLecture Notes in Physics
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages8
Publication statusPublished - 2021

Publication series

NameLecture Notes in Physics
ISSN (Print)0075-8450
ISSN (Electronic)1616-6361


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