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Anomalous magnetic dipole moment — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T12:15:33.236Z
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Anomalous magnetic dipole moment — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_28e02630ea76 (Metraipolis archive dc_28e02630ea76, sha256 e1cd76cb32df1f05911bc5286e1cbd0cc472707ed4cf62466409187dcd60f965)

BibTeX

@misc{dc28e02630ea76,
  title = {Anomalous magnetic dipole moment — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_28e02630ea76; sha256 e1cd76cb32df1f05911bc5286e1cbd0cc472707ed4cf62466409187dcd60f965},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In quantum electrodynamics, the anomalous magnetic moment of a particle is a contribution of effects of quantum mechanics, expressed by Feynman diagrams with loops, to the magnetic moment of that particle. The magnetic moment, also called magnetic dipole moment, is a measure of the strength of a magnetic source. The "Dirac" magnetic moment, corresponding to tree-level Feynman diagrams (which can be thought of as the classical result), can be calculated from the Dirac equation. It is usually expressed in terms of the g-factor; the Dirac equation predicts g=2. For particles such as the electron, this classical result differs from the observed value by a small fraction of a percent. The difference is the anomalous magnetic moment, denoted a and defined as a=g−22

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Anomalous magnetic dipole moment» — https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment
Wikidata Q771367: «quantum field-theoretic differences of magnetic properties than expected from classical theories» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q771367
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Anomalous_magnetic_dipole_moment?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1380070895, consultata il 2026-11-09T12:11:17.061Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: ce9aa28b64f736402b604810f806298e8655ae67ca495832a98adb13573ea9cb