{"paper":{"title":"FCNC decays of SM fermions into a dark photon","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Barbara Mele, Elena Venturini, Emidio Gabrielli, Martti Raidal","submitted_at":"2016-07-20T12:03:54Z","abstract_excerpt":"We analyze a new class of FCNC processes, the $f \\to f^{\\prime} \\, \\bar{\\gamma}$ decays of a fermion $f$ into a lighter (same-charge) fermion $f^{\\prime}$ plus a {\\it massless} neutral vector boson, a {\\it dark photon} $\\bar{\\gamma}$. A massless dark photon does not interact at tree level with observable fields, and the $f \\!\\to\\! f^{\\prime} \\, \\bar{\\gamma}$ decay presents a characteristic signature where the final fermion $f^{\\prime}$ is balanced by a {\\it massless invisible} system. Models recently proposed to explain the exponential spread in the standard-model Yukawa couplings can indeed f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.05928","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"}