How Large is the "Natural" Magnetic Moment?

Abstract

The "natural" magntic moment of a particle of spin S is generally assumed to be that given by the Belinfante conjecture and has the value g=1/S for its gyromagnetic ratio. Thus, for the spin 1/2 electron we find the Dirac value $g_e=2$. However, in the standard model the charged W boson, a spin one particle, is found to have the value $g_{W^{+}}=2$. We show how this result comes about and argue that the "natural" value for any particle of spin S should be g=2, independent of spin.

23 pages, 2 figures, to be published in the American Journal of Physics

Cited by in corpus (5)

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• Compton scattering off elementary spin 3/2 particles
• Electromagnetic couplings of elementary vector particles
• Second order formalism for spin 1/2 fermions and Compton scattering
• Electromagnetic multipole moments of elementary spin-1/2, 1, and 3/2 particles