{"paper":{"title":"Searching a Dark Photon with HADES","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"hep-ex","authors_text":"A. Balanda, A. Belyaev, A. Blanco, A. Dybczak, A. Ierusalimov, A. Ivashkin, A. Krasa, A. Kugler, A. Kurepin, A. Lebedev, A. Mangiarotti, A. Reshetin, A. Rustamov, A. Sadovsky, A. Schmah, A. Tarantola, B. Kaempfer, B. Michalska, B. Ramstein, B. Spruck, B. W. Kolb, C. Muentz, C. Sturm, C. Wendisch, D. Belver, D. Gonzalez-Diaz, E. Epple, E. Schwab, F. Guber, F. Krizek, G. Kornakov, HADES Collaboration: G. Agakishiev, H. Kuc, H. Schuldes, H. Stroebele, H. Tsertos, I. Froehlich, I. Iori, I. Koenig, J. A. Garzon, J.C. Berger-Chen, J. Friese, J. L. Boyard, J. Markert, J. Michel, J. Pietraszko, J. Siebenson, J. Stroth, J. Wuestenfeld, K. Goebel, K. Lapidus, K. Teilab, L. Fabbbietti, L. Lopes, L. Maier, L. Naumann, M. Boehmer, M. Golubeva, M. Gumberidze, M. Jurkovic, M. Lorenz, M. Palka, M. Traxler, M. Weber, O. Fateev, O. Pechenova, P. Cabanelas, P. Finocchiaro, P. Fonte, P. Salabura, P. Tlusty, R. Gernhaeuser, R. Holzmann, R. Kotte, R. Kruecken, R. Lalik, R. Trebacz, S. Chernenko, S. Lang, S. Spataro, S. Yurevich, T. Galatyuk, T. Heinz, T. Hennino, T. Karavicheva, T. Liu, T. Scheib, T. Vasiliev, V. Ladygin, V. Metag, V. Pechenov, V. Petousis, V. Wagner, W. Koenig, W. Kuehn, W. Przygoda, Y. C. Pachmayer, Y. Parpottas, Yu.G. Sobolev, Y. Zanevsky","submitted_at":"2013-11-01T16:17:10Z","abstract_excerpt":"We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon^{2} at 90% CL has been obtained for the mass range M(U) = 0.02 - 0.55 GeV/c2 and is compared with the present world data set. For masses 0.03 - 0.1 GeV/c^2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favoured by the muon g-2 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0216","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":""},"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"}