{"paper":{"title":"Two Higgs doublet model with a complex singlet scalar and Multi-critical Point Principle","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Imposing the tree-level multiple point principle in a two-Higgs-doublet model with a complex singlet scalar still permits viable dark matter parameter regions and a thermally driven strong first-order electroweak phase transition.","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Chiaki Nose, Chikako Idegawa, Gi-Chol Cho","submitted_at":"2026-01-06T08:31:19Z","abstract_excerpt":"We study a two Higgs doublet model extended by a complex singlet scalar, in which the imaginary part of the singlet serves as a dark matter (DM) candidate. In this model, degenerate masses of the three neutral Higgs bosons are crucial for achieving consistency with current constraints from DM direct-detection experiments and Higgs searches. This is called the degenerate scalar scenario. To provide a theoretical motivation for such a degenerate Higgs spectrum, we impose the tree-level Multiple Point Principle (MPP), which requires the electroweak and singlet vacua to be degenerate, and analyze "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Viable parameter regions still exist in which the observed DM constraints are satisfied, and thermal loop effects can induce a strong first-order electroweak phase transition compatible with electroweak baryogenesis.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The tree-level multiple point principle is imposed by hand to enforce vacuum degeneracy, and the resulting large doublet-singlet mixing is assumed to be compatible with the degenerate scalar scenario after all constraints are applied.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A 2HDM extended by a complex singlet uses tree-level MPP to motivate degenerate neutral Higgs masses, yielding viable DM phenomenology and a thermally induced strong first-order electroweak phase transition.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Imposing the tree-level multiple point principle in a two-Higgs-doublet model with a complex singlet scalar still permits viable dark matter parameter regions and a thermally driven strong first-order electroweak phase transition.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"4b4ce4b3198b2c08e6511b8607eef80a69b42aa7c9ee6aa1c6b1d77aed163a42"},"source":{"id":"2601.02808","kind":"arxiv","version":2},"verdict":{"id":"f1a26bee-512d-4714-8557-49233f2fc3a4","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T17:33:36.576980Z","strongest_claim":"Viable parameter regions still exist in which the observed DM constraints are satisfied, and thermal loop effects can induce a strong first-order electroweak phase transition compatible with electroweak baryogenesis.","one_line_summary":"A 2HDM extended by a complex singlet uses tree-level MPP to motivate degenerate neutral Higgs masses, yielding viable DM phenomenology and a thermally induced strong first-order electroweak phase transition.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The tree-level multiple point principle is imposed by hand to enforce vacuum degeneracy, and the resulting large doublet-singlet mixing is assumed to be compatible with the degenerate scalar scenario after all constraints are applied.","pith_extraction_headline":"Imposing the tree-level multiple point principle in a two-Higgs-doublet model with a complex singlet scalar still permits viable dark matter parameter regions and a thermally driven strong first-order electroweak phase transition."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2601.02808/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":37,"sample":[{"doi":"","year":2012,"title":"Observation of a new particle in the search for the standard model higgs boson with the atlas detector at the lhc.Physics Letters B2012;716(1):1–29","work_id":"ecf87d7b-ffee-4edd-a7cd-56371de672ff","ref_index":1,"cited_arxiv_id":"1207.7214","is_internal_anchor":true},{"doi":"","year":2012,"title":"Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC","work_id":"02ab5f35-5521-45e2-bb51-6c2b69b1c615","ref_index":2,"cited_arxiv_id":"1207.7235","is_internal_anchor":true},{"doi":"","year":1973,"title":"T. D. Lee, Phys. Rev. D8, 1226 (1973)","work_id":"9d54cc44-c167-4aae-bff0-418bc512ac82","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1958,"title":"S. L. Glashow and S. Weinberg, Phys. Rev. D15, 1958 (1977)","work_id":"8a221cc4-6a63-4a25-b998-75bac93516cd","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1978,"title":"N. G. Deshpande and E. Ma, Phys. Rev. D18, 2574 (1978)","work_id":"234a0175-42f3-4568-ab15-8d208111c180","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":37,"snapshot_sha256":"ae836b7f06691e6f30d5f79424279499035cd1222c680bfa00dc36ea7b24ec0b","internal_anchors":17},"formal_canon":{"evidence_count":2,"snapshot_sha256":"d32e7694dd218305a1ed133d1a54453f4960764ddc2f07e218189e2da4654995"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}