{"id":"W4414575964","doi":"10.1016/j.physletb.2025.140119","title":"Search for heavy neutral leptons in <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" altimg=\"si1.svg\"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> decays to positrons","year":2025,"lang":"en","type":"preprint","venue":"Physics Letters B","topic":"Particle physics theoretical and experimental studies","field":"Physics and Astronomy","cited_by":1,"is_retracted":false,"has_abstract":true,"ca_institutions":"","funders":"Horizon 2020 Framework Programme; Science and Technology Facilities Council; Ministero dell’Istruzione, dell’Università e della Ricerca; Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky; European Research Council; Institutul de Fizică Atomică; Grantová Agentura České Republiky; Fonds De La Recherche Scientifique - FNRS; Bundesministerium für Bildung und Forschung; Ministerstvo Školství, Mládeže a Tělovýchovy; Agence Nationale de la Recherche; Consejo Nacional de Ciencia y Tecnología; Royal Society; National Science Foundation; Natural Sciences and Engineering Research Council of Canada; Ministère de l’Enseignement Supérieur et de la Recherche Scientifique; Istituto Nazionale di Fisica Nucleare; CERN; Univerzita Karlova v Praze","keywords":"Lepton; Neutrino; Large Hadron Collider; Positron; Mixing (physics); Range (aeronautics); Standard Model (mathematical formulation); Lepton number; Pontecorvo–Maki–Nakagawa–Sakata matrix","routes":{"ca_aff":false,"ca_fund":true,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":true},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.0008046539,0.0005851291,0.0003864251,0.001064034,0.0006405928,0.001000625,0.0004620428,0.0006239259,0.005367523],"category_scores_gemma":[0.0005229847,0.0003088968,0.0003394386,0.0009529237,0.0002433156,0.0005035796,0.0006011099,0.0002034076,0.001149055],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.0003686668,"about_ca_system_score_gemma":0.0004314801,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.001398122,"about_ca_topic_score_gemma":0.002709831,"domain_scores_codex":[0.9997725,0.00004068728,0.000009932031,0.00007628065,0.00004612351,0.00005450815],"domain_scores_gemma":[0.9995502,0.0001572942,0.0001058904,0.00006125155,0.00005047823,0.00007487354],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"bench_or_experimental","study_design_gemma":"bench_or_experimental","study_design_scores_codex":[0.00578235,0.0006839206,0.3190932,0.0006192331,0.0004294236,0.003649608,0.0007710211,0.001777857,0.5900881,0.01035715,0.00735757,0.05939056],"study_design_scores_gemma":[0.000678803,0.002588981,0.2520817,0.0001153686,0.0003990013,0.004551485,0.001176318,0.02006201,0.6520187,0.009053931,0.05712661,0.000147154],"study_design_candidate":"bench_or_experimental","study_design_consensus":"bench_or_experimental","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9797718,0.0004848334,0.004429261,0.0001331787,0.00001373189,0.0000527545,0.002173788,0.0002697047,0.01267099],"genre_scores_gemma":[0.9838896,0.0002170277,0.005942135,0.0001004813,0.00001247932,0.00002511301,0.003644685,0.00005562565,0.006113019],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.005367523,"threshold_uncertainty_score":0.01795614,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.02082835970351639,"score_gpt":0.270593527440999,"score_spread":0.2497651677374826,"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."}}