- Tytuł:
- Searching a dark photon with HADES
- Autorzy:
-
Lorenz, M.
Chernenko, S.
Iori, I.
Pechenova, O.
Galatyuk, T.
Vasiliev, T.
Markert, J.
Petousis, V.
Kotte, R.
Golubeva, M.
Yurevich, S.
Böhmer, M.
Mangiarotti, A.
Müntz, C.
Siebenson, J.
Kämpfer, B.
Michel, J.
Sturm, C.
Traxler, M.
Schwab, E.
Ivashkin, A.
Blanco, A.
Garzón, J. A.
Przygoda, Witold
Weber, M.
Krása, A.
Lebedev, A.
Ladygin, V.
Sadovsky, A.
Göbel, K.
Pachmayer, Y. C.
Pałka, Marek
Pietraszko, J.
Boyard, J. L.
Naumann, L.
Ierusalimov, A.
Pechenov, V.
Belver, D.
Rustamov, A.
Fröhlich, I.
Koenig, I.
Stroth, J.
Friese, J.
Reshetin, A.
Salabura, Piotr
Gernhäuser, R.
Schuldes, H.
Lang, S.
Kolb, B. W.
Maier, L.
Lopes, L.
Holzmann, R.
Spataro, S.
González-Díaz, D.
Krücken, R.
Ströbele, H.
Guber, F.
Spruck, B.
Jurkovic, M.
Michalska, Beata
Fonte, P.
Heinz, T.
Epple, E.
Kugler, A.
Lalik, R.
Kornakov, G.
Parpottas, Y.
Kurepin, A.
Dybczak, Adrian
Kühn, W.
Koenig, W.
Wagner, V.
Hennino, T.
Karavicheva, T.
Fateev, O.
Tsertos, H.
Teilab, K.
Kuc, Hubert
Metag, V.
Scheib, T.
Wendisch, C.
Krizek, F.
Lapidus, K.
Ramstein, B.
Fabbietti, L.
Sobolev, Yu. G.
Tlusty, P.
Schmah, A.
Wüstenfeld, J.
Berger-Chen, J. C.
Bałanda, Andrzej
Belyaev, A.
Liu, T.
Agakishiev, G.
Zanevsky, Y.
Trębacz, Radosław
Finocchiaro, P.
Gumberidze, M.
Tarantola, A.
Cabanelas, P. - Opis:
- 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 $\epsilon ^{2}$ at 90% CL has been obtained for the mass range $M_{U}$=0.02-0.55 GeV/$c^{2}$ 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 favored by the muon g−2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 $\times 10^{-6}$ has been set on the helicity-suppressed direct decay of the eta meson, $\eta \rightarrow e^{+}e^{-}$, at 90% CL.
- Dostawca treści:
- Repozytorium Uniwersytetu Jagiellońskiego
Artykuł