g=2 as the natural value of the tree-level gyromagnetic ratio of elementary particles

Sergio Ferrara, Massimo Porrati, Valentine L. Telegdi

    Research output: Contribution to journalArticle


    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.

    Original languageEnglish (US)
    Pages (from-to)3529-3537
    Number of pages9
    JournalPhysical Review D
    Issue number8
    StatePublished - Jan 1 1992


    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

    Cite this