{"paper":{"title":"Kinematic Fingerprints of a Nucleon-Triggered $V_{\\mathcal{B}}$ in Rare $\\eta^{(\\prime)}\\to\\pi^0(\\eta)\\gamma\\gamma$ Decays on Nucleon Targets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Yaroslav Balytskyi","submitted_at":"2026-08-13T17:53:11Z","abstract_excerpt":"The nucleon-triggered vector-boson scenario $V_{\\mathcal B}$ was motivated by a statistically significant discrepancy between the KLOE measurement, $\\mathrm{BR}^{\\eta\\rightarrow\\pi^{0}\\gamma\\gamma}_{\\text{KLOE}} = \\left(0.98\\pm0.11_{\\text{stat}}\\pm0.14_{\\text{syst}}\\right)\\times10^{-4}$, and the current world average, $\\left(2.55\\pm0.22\\right)\\times10^{-4}$, dominated by MAMI photoproduction data. In this model, the new interaction is activated by external nucleons, which causes deviations from the Standard Model predictions, while leaving leptonic measurements, such as KLOE and BESIII, unaffe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.13537","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.13537/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}