Searching a dark photon with HADES
Date
2014Author
Krücken, R.Agakishiev, G.
Bałanda, A.
Belver, D.
Belyaev, A.
Berger-Chen, J. C.
Blanco, A.
Böhmer, M.
Boyard, J. L.
Cabanelas, Pablo
Chernenko, S.
Dybczak, A.
Epple, E.
Fabbietti, L.
Fateev, O.
Finocchiaro, P.
Fonte, P.
Friese, J.
Fröhlich, I.
Galatyuk, T.
Garzón, J. A.
Gernhäuser, R.
Göbel, K.
Golubeva, M.
González-Díaz, D.
Guber, F.
Gumberidze, M.
Heinz, T.
Hennino, T.
Holzmann, R.
Ierusalimov, A.
Iori, I.
Ivashkin, A.
Jurkovic, M.
Kämpfer, B.
Karavicheva, T.
Koenig, I.
Koenig, W.
Kolb, B. W.
Kornakov, G.
Kotte, R.
Krása, Antonín
Krizek, F.
Kuc, H.
Kühn, W.
Kugler, A.
Kurepin, A.
Ladygin, V.
Lalik, R.
Lang, S.
Lapidus, K.
Lebedev, A.
Liu, T.
Lopes, L.
Lorenz, M.
Maier, L.
Mangiarotti, A.
Markert, J.
Metag, V.
Michalska, B.
Michel, J.
Müntz, C.
Naumann, L.
Pachmayer, Y. C.
Palka, M.
Parpottas, Yiannis
Pechenov, V.
Pechenova, O.
Petousis, Vlassis
Pietraszko, J.
Przygoda, W.
Ramstein, B.
Reshetin, A.
Rustamov, A.
Sadovsky, A.
Salabura, P.
Scheib, T.
Schuldes, H.
Schmah, A.
Schwab, E.
Siebenson, J.
Sobolev, Y.
Spataro, S.
Spruck, B.
Ströbele, H.
Stroth, J.
Sturm, C.
Tarantola, A.
Teilab, K.
Tlusty, P.
Traxler, M.
Trebacz, R.
Tsertos, Haralambos
Vasiliev, T.
Wagner, V.
Weber, M.
Wendisch, C.
Wüstenfeld, J.
Yurevich, S.
Zanevsky, Y.
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy PhysicsVolume
731Pages
265-271Google Scholar check
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Show full item recordAbstract
We present a search for the e +e - decay of a hypothetical dark photon, also named 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 ε2 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/c2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favored by the muon g - 2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 × 10 -6 has been set on the helicity-suppressed direct decay of the eta meson, η→e +e -, at 90% CL. © 2014 The Authors.