{"paper":{"title":"A search for two body muon decay signals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Gaponenko, A. Grossheim, A. Hillairet, A. Olin, B. Shin, C. A. Gagliardi, D. D. Koetke, D. R. Gill, E. L. Mathie, G. M. Marshall, G. Sheffer, J. Bueno, J. Hu, J.-M. Poutissou, K. Olchanski, M. C. Fujiwara, M. D. Hasinoff, P. Depommier, P. Gumplinger, R. Bayes, R. E. Mischke, R. E. Tribble (the TWIST Collaboration), R. Openshaw, R. P. MacDonald, R. Poutissou, R. S. Henderson, R. Tacik, T. D. S. Stanislaus, V. Selivanov, W. Faszer, Yu. I. Davydov","submitted_at":"2014-09-02T09:12:28Z","abstract_excerpt":"Lepton family number violation is tested by searching for $\\mu^+\\to e^+X^0$ decays among the 5.8$\\times 10^8$ positive muon decay events analyzed by the TWIST collaboration. Limits are set on the production of both massless and massive $X^0$ bosons. The large angular acceptance of this experiment allows limits to be placed on anisotropic $\\mu^+\\to e^+X^0$ decays, which can arise from interactions violating both lepton flavor and parity conservation. Branching ratio limits of order $10^{-5}$ are obtained for bosons with masses of 13 - 80 MeV/c$^2$ and with different decay asymmetries. For boson"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.0638","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"}