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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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1807.02691","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ex","submitted_at":"2018-07-07T16:49:39Z","cross_cats_sorted":[],"title_canon_sha256":"ed7a7c6e9f036d32a1e3b53e28077435461dede690cba9f047dcf0e8f54cefad","abstract_canon_sha256":"304c51ffc3da198d100c282a9f56e590fb8e6770b7d8a22c1e037f0dfbad6087"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:14.055668Z","signature_b64":"oSaqrb2nPizX+bJQUe+1GxeLg2BFFWBLgfjJ6awo479pZkAtmH1KZMOGCMehVpRONkE0YE0Te2IcZfOi8JdFCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f3401fd9ad4ab290d579d471c49019936b0b68686b6f74471338d5fdc816ff06","last_reissued_at":"2026-05-17T23:42:14.054824Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:14.054824Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"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. 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