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

References in corpus (4)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Perturbative Quantum Gravity and its Relation to Gauge Theory
• Factorization and polarization in linearized gravity
• The Gerasimov-Drell-Hearn Sum Rule and the Spin Structure of the Nucleon

Cited by in corpus (14)

• On-shell heavy particle effective theories
• Graviton-Photon Scattering
• Quark transverse charge densities in the $\Delta (1232)$ from lattice QCD
• On the Double Copy for Spinning Matter
• Chiral effective-field theory in the Delta(1232) region: II. radiative pion photoproduction
• Electroweak-Symmetric Dark Monopoles from Preheating
• Compton scattering off elementary spin 3/2 particles
• Covariant basis induced by parity for the $(j,0)\oplus (0,j)$ representation
• 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
• Bohmian trajectories for Kerr-Newman particles in complex space-time
• Revisiting Higher-Spin Gyromagnetic Couplings
• On the electromagnetic interaction and the anomalous term in the Duffin-Kemmer-Petiau theory