{"paper":{"title":"Combined limit on the production of a light gauge boson decaying into $\\mu^+\\mu^-$ and $\\pi^+\\pi^-$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Budano, A. De Santis, A. Di Cicco, A. Di Domenico, A. d'Uffizi, A. Fantini, A. Gajos, A. Kupsc, A. Passeri, A. Selce, B. Cao, C. Bloise, D. Babusci, D. Domenici, D. Kisielewska-Kami\\'nska, D. Moricciani, E. A. Kozyrev, E. Czerwi\\'nski, E. Dan\\'e, E. De Lucia, E. Graziani, E. Perez del Rio, E. P. Solodov, F. Bossi, F. Ceradini, F. Curciarello, F. Sirghi, G. D'Agostinio, G. Fantini, G. Mandaglio, G. Venanzoni, KLOE-2 Collaboration: A. Anastasi, L. Tortora, M. Berlowski, M. Martini, M. Schioppa, M. Silarski, M. Wolke, N. Raha, P. A. Lukin, P. Branchini, P. Ciambrone, P. De Simone, P. Fermani, P. Gauzzi, P. Moskal, P. Santangelo, R. Messi, S. Fiore, S. Giovannella, S. Miscetti, T. Johansson, V. De Leo, V. L. Ivanov, V. Patera, W. Krzemien, W. Wi\\'slicki, X. Kang","submitted_at":"2018-07-07T16:49:39Z","abstract_excerpt":"We searched for the $\\mu^+\\mu^-$ decay of a light vector gauge boson, also known as dark photon, in the $e^+ e^- \\to \\mu^+ \\mu^- \\gamma_{\\rm ISR}$ process by means of the Initial State Radiation (ISR) method. We used 1.93~fb$^{-1}$ of data collected by the KLOE experiment at the DA$\\Phi$NE $\\phi$-factory. No structures have been observed over the irreducible $\\mu^+ \\mu^-$ background. A 90\\% CL limit on the ratio $\\varepsilon^2=\\alpha^{\\prime}/\\alpha$ between the dark coupling constant and the fine structure constant of $ 3\\times 10^{-6}-2\\times 10^{-7}$ has been set in the dark photon mass reg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.02691","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"}