{"paper":{"title":"Hybrid Seesaw Neutrino Masses with A_4 Family Symmetry","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Ernest Ma (University of California, Michele Frigerio, Riverside), Shao-Long Chen","submitted_at":"2005-04-20T19:24:16Z","abstract_excerpt":"We consider the scenario in which neutrino data are explained by the interplay of type I and II seesaw terms in the Majorana neutrino mass matrix ${\\cal M}_\\nu = {\\cal M}_L - {\\cal M}_D {\\cal M}_R^{-1} {\\cal M}_D^T$. We construct a predictive model with ${\\cal M}_L$ proportional to the unit matrix, 3 diagonal texture zeros in ${\\cal M}_R$, and ${\\cal M}_D$ diagonal. We show how this pattern can be maintained by the non-Abelian discrete symmetry $A_4$, and discuss its phenomenological consequences. It turns out that the two types of seesaw give contributions of the same order to ${\\cal M}_\\nu$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0504181","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}