We implement at the Lagrangian level a "natural" electromagnetic coupling prescription, different from the minimal one, and proposed a long time ago by Weinberg. This prescription yields, for elementary particles of arbitrary-spin, a gyromagnetic ratio g=2 at the tree level. This value is already known to arise in renormalizable theories for spin and spin 1, is suggested by the classical, relativistic equations of the spin polarization, and is also found for arbitrary-spin, charged excitations of the open string.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)