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Hybrid seesaw from SU(2)1 × SU(2)2 × U(1)Y

  • Antonio Herrero-Brocal
  • Javier Perez-Soler
  • Avelino Vicente
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Abstract

We study neutrino mass generation in a model based on the SU(3)c × SU(2)1 × SU(2)2 × U(1)Y gauge symmetry, in which the Standard Model SU(2)L arises at low energies as the diagonal subgroup of the two SU(2) factors. The symmetry is enlarged with a global U(1)B−L symmetry, spontaneously broken by the vacuum expectation value of a scalar bidoublet. Light neutrino masses are generated at tree level through a hybrid of the type-III, inverse and linear seesaw mechanisms. A distinctive feature of the construction is the existence of a Nambu-Goldstone boson, the majoron, which transforms non-trivially under the original gauge symmetry while being mostly singlet under the Standard Model gauge group. We explore the phenomenological consequences of this setup, including electroweak precision constraints, the production of the nearly degenerate W' and Z' bosons at colliders and lepton flavor violating decays with a majoron in the final state. The latter constitute the most promising signature of the model.

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Cite

BibTeXRIS
BibTeX
@misc{herrerobrocal2026hybrid,
  title = {{Hybrid seesaw from $SU(2)_1 \times SU(2)_2 \times U(1)_Y$}},
  author = {Antonio Herrero-Brocal and Javier Perez-Soler and Avelino Vicente},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.36060},
  eprint = {2610.36060},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.36060},
}
RIS
TY  - UNPB
TI  - Hybrid seesaw from SU(2)_1 × SU(2)_2 × U(1)_Y
AU  - Antonio Herrero-Brocal
AU  - Javier Perez-Soler
AU  - Avelino Vicente
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.36060
UR  - https://arxiv.org/abs/2610.36060
AB  - We study neutrino mass generation in a model based on the SU(3)_c × SU(2)_1 × SU(2)_2 × U(1)_Y gauge symmetry, in which the Standard Model SU(2)_L arises at low energies as the diagonal subgroup of the two SU(2) factors. The symmetry is enlarged with a global U(1)_B−L symmetry, spontaneously broken by the vacuum expectation value of a scalar bidoublet. Light neutrino masses are generated at tree level through a hybrid of the type-III, inverse and linear seesaw mechanisms. A distinctive feature of the construction is the existence of a Nambu-Goldstone boson, the majoron, which transforms non-trivially under the original gauge symmetry while being mostly singlet under the Standard Model gauge group. We explore the phenomenological consequences of this setup, including electroweak precision constraints, the production of the nearly degenerate W' and Z' bosons at colliders and lepton flavor violating decays with a majoron in the final state. The latter constitute the most promising signature of the model.
ER  -