{"id":"W4417268506","doi":"10.1103/25tk-nctn","title":"First Results on the Search for Lepton Number Violating Neutrinoless Double- <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"> <mml:mi>β</mml:mi> </mml:math> Decay with the LEGEND-200 Experiment","year":2025,"lang":"en","type":"article","venue":"Physical Review Letters","topic":"Neutrino Physics Research","field":"Physics and Astronomy","cited_by":14,"is_retracted":false,"has_abstract":true,"ca_institutions":"Queen's University; Simon Fraser University","funders":"Los Alamos National Laboratory; Lawrence Berkeley National Laboratory; Oak Ridge National Laboratory; National Science Foundation; Laboratory Directed Research and Development; Max-Planck-Gesellschaft; Office of International Science and Engineering; Division of Physics; Laboratori Nazionali del Gran Sasso; Ministerstwo Edukacji i Nauki; European Research Council; Nuclear Physics; Natural Sciences and Engineering Research Council of Canada; Science and Technology Facilities Council; Horizon 2020 Framework Programme; Office of Science; Bundesministerium für Bildung und Forschung; Ministerstvo Školství, Mládeže a Tělovýchovy; European Commission; Instituto Nazionale di Fisica Nucleare; Agentúra na Podporu Výskumu a Vývoja; Deutsche Forschungsgemeinschaft; Narodowe Centrum Nauki; U.S. Department of Energy; National Energy Research Scientific Computing Center; H2020 Marie Skłodowska-Curie Actions; Strong; Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung","keywords":"MAJORANA; Double beta decay; Lepton number; Semiconductor detector; Sensitivity (control systems); Neutrino; Limit (mathematics); Germanium; Detector","routes":{"ca_aff":true,"ca_fund":true,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"codex-gemma-dda1882f352a","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.0005158626,0.0003344546,0.0003033163,0.00003044268,0.0006798353,0.0002487532,0.0007402031,0.00003818992,0.00001208488],"category_scores_gemma":[0.000004062549,0.0002360335,0.0004770379,0.0003898301,0.0002437316,0.0001794753,0.0003929757,0.0006728636,0.0003464128],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.00002921547,"about_ca_system_score_gemma":0.0001512077,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.0001939243,"about_ca_topic_score_gemma":0.000009457966,"domain_scores_codex":[0.9975114,0.0001241286,0.000402257,0.0005960417,0.0006838047,0.000682332],"domain_scores_gemma":[0.9974661,0.001150498,0.0002389781,0.0009513336,0.0000732644,0.0001197535],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"theoretical_or_conceptual","study_design_gemma":"bench_or_experimental","study_design_scores_codex":[0.0002761289,0.0002261021,0.00001932137,0.0004855349,0.0002251213,0.000006560711,0.0003431127,0.0008755061,0.002366069,0.9927036,0.001217987,0.001254915],"study_design_scores_gemma":[0.005074159,0.0007296066,0.0002514202,0.01011203,0.000825619,0.00001164939,0.001199732,0.2999139,0.6160418,0.0003220328,0.06400339,0.001514663],"study_design_candidate":"theoretical_or_conceptual","study_design_consensus":null,"genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9788887,0.0002211646,0.0005785673,0.01077031,0.0001235959,0.0004445765,0.00006658636,0.00003787817,0.008868657],"genre_scores_gemma":[0.9952592,0.0001303947,0.00004831755,0.002246333,0.0007450763,0.001357693,0.00008808058,0.00007220347,0.00005275877],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.9923816,"threshold_uncertainty_score":0.9625166,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.02945068159751279,"score_gpt":0.312201660005859,"score_spread":0.2827509784083462,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}