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PreprintCC BY 4.0arXiv

General one-loop expressions for the diagonal and transition electromagnetic moments of spin-1/2 fermions

  • Alejandro Ibarra
  • Merlin Reichard
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Abstract

Electrically neutral spin-1/2 fermions can interact via Yukawa or gauge couplings with electrically charged particles, leading to quantum-induced couplings between the neutral fermion and the photon. In this paper, we present general expressions for the diagonal and transition electromagnetic moments of Dirac and Majorana spin-1/2 fermions generated at the one-loop level. We also briefly discuss the implications of these results for several neutral spin-1/2 fermions of phenomenological interest, such as neutral components of SU(2)L multiplets (which are potential candidates for dark matter) or Standard Model neutrinos.

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Cite

BibTeXRIS
BibTeX
@misc{ibarra2026general,
  title = {{General one-loop expressions for the diagonal and transition electromagnetic moments of spin-1/2 fermions}},
  author = {Alejandro Ibarra and Merlin Reichard},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.09974},
  eprint = {2610.09974},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.09974},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - General one-loop expressions for the diagonal and transition electromagnetic moments of spin-1/2 fermions
AU  - Alejandro Ibarra
AU  - Merlin Reichard
PY  - 2026
DA  - 2026/10/07
PB  - arXiv
DO  - 10.48550/arxiv.2610.09974
UR  - https://arxiv.org/abs/2610.09974
AB  - Electrically neutral spin-1/2 fermions can interact via Yukawa or gauge couplings with electrically charged particles, leading to quantum-induced couplings between the neutral fermion and the photon. In this paper, we present general expressions for the diagonal and transition electromagnetic moments of Dirac and Majorana spin-1/2 fermions generated at the one-loop level. We also briefly discuss the implications of these results for several neutral spin-1/2 fermions of phenomenological interest, such as neutral components of SU(2)_L multiplets (which are potential candidates for dark matter) or Standard Model neutrinos.
ER  -