{
  "abstract": "A bstract : We investigate the double seesaw mechanism for generating light neutrino masses within a Standard Model extension containing three right-handed neutrinos and three gauge-singlet sterile fermions. The flavour structure is governed by an A ₄ discrete symmetry, which leads to predictive textures for the Dirac neutrino mass matrix M D , the right-handed-sterile neutrino mixing matrix M RS , and the sterile-sector Majorana mass matrix M S . With suitable A ₄ charge assignments and simple flavon vacuum alignments, the model naturally realizes a leading-order tribimaximal (TBM) mixing pattern corrected by a single complex rotation in the (1 , 3) sector, resulting in the exact TM ₂ mixing structure. This framework successfully reproduces the observed reactor mixing angle while providing predictive relations among the neutrino masses, mixing parameters, and CP-violating phases. The recent high-precision JUNO determination of the solar mixing angle, however, places the exact TM ₂ prediction, sin ² θ ₁₂ ≃ 0 . 341, in significant tension with the experimental data. Motivated by this discrepancy, we extend the exact TM ₂ framework by introducing a small perturbation in the sterile-sector Majorana mass matrix, leading to a generalized TM ₂ mixing structure. The additional degree of freedom relaxes the rigid TM ₂ sum rule and allows the solar mixing angle to vary over the experimentally preferred region while preserving the successful predictions for the reactor and atmospheric mixing angles. A comprehensive numerical analysis is performed using the latest JUNO and NuFIT 6.1 neutrino oscillation data. The generalized TM ₂ framework successfully reproduces the observed neutrino mass spectrum and mixing parameters, predicts characteristic correlations among CP-violating phases and oscillation observables, and yields phenomenologically viable regions for neutrinoless double beta decay. The interplay between the double seesaw mechanism, A ₄ flavour symmetry, and the generalized TM ₂ structure therefore provides a predictive and experimentally testable framework for understanding neutrino masses and flavour mixing.",
  "abstract_shown": true,
  "affiliations": [
    "SOA University",
    "Gauhati University",
    "Utkal University",
    "Indian Institute of Technology Bhilai",
    "Institute of Physics"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Swaraj Kumar Nanda",
      "orcid": "0009-0004-6801-5484"
    },
    {
      "affs": [
        1
      ],
      "name": "Maibam Ricky Devi",
      "orcid": "0000-0002-1086-8407"
    },
    {
      "affs": [
        2
      ],
      "name": "Chandini Dash",
      "orcid": "0000-0003-1079-6439"
    },
    {
      "affs": [
        0
      ],
      "name": "R. N. Panda",
      "orcid": "0000-0001-5296-5187"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Sudhanwa Patra",
      "orcid": "0000-0002-7469-2279"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0cq4ertajxf6x.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep11(2026)045",
  "fulltext_url": null,
  "id": "0cq4ertajxf6x",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP11(2026)045",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP11(2026)045.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/0cq4ertajxf6x.ris",
  "sources": [
    {
      "first_seen": "2026-11-09T12:21:14Z",
      "native_id": "10.1007/jhep11(2026)045",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP11(2026)045"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "issn:1029-8479",
      "subfield": "high-energy"
    }
  ],
  "title": "An A4-symmetric double seesaw for neutrino masses and mixing in light of JUNO results",
  "title_text": "An A4-symmetric double seesaw for neutrino masses and mixing in light of JUNO results",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T12:21:14Z",
  "url": "https://research.draconitic.com/paper/0cq4ertajxf6x",
  "venue": "Journal of High Energy Physics",
  "versions": []
}