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28 March 2024
 
  » arxiv » 1311.0216

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Searching a Dark Photon with HADES
HADES Collaboration ; G. Agakishiev ; A. Balanda ; D. Belver ; A. Belyaev ; J.C. Berger-Chen ; A. Blanco ; M. Boehmer ; J. L. Boyard ; P. Cabanelas ; S. Chernenko ; A. Dybczak ; E. Epple ; L. Fabbbietti ; O. Fateev ; P. Finocchiaro ; P. Fonte ; J. Friese ; I. Froehlich ; T. Galatyuk ; J. A. Garzon ; R. Gernhaeuser ; K. Goebel ; M. Golubeva ; D. Gonzalez-Diaz ; F. Guber ; M. Gumberidze ; T. Heinz ; T. Hennino ; R. Holzmann ; A. Ierusalimov ; I. Iori ; A. Ivashkin ; M. Jurkovic ; B. Kaempfer ; T. Karavicheva ; I. Koenig ; W. Koenig ; B. W. Kolb ; G. Kornakov ; R. Kotte ; A. Krasa ; F. Krizek ; R. Kruecken ; H. Kuc ; W. Kuehn ; A. Kugler ; A. Kurepin ; V. Ladygin ; R. Lalik ; S. Lang ; K. Lapidus ; A. Lebedev ; T. Liu ; L. Lopes ; M. Lorenz ; L. Maier ; A. Mangiarotti ; J. Markert ; V. Metag ; B. Michalska ; J. Michel ; C. Muentz ; L. Naumann ; Y. C. Pachmayer ; M. Palka ; Y. Parpottas ; V. Pechenov ; O. Pechenova ; V. Petousis ; J. Pietraszko ; W. Przygoda ; B. Ramstein ; A. Reshetin ; A. Rustamov ; A. Sadovsky ; P. Salabura ; T. Scheib ; H. Schuldes ; A. Schmah ; E. Schwab ; J. Siebenson ; Yu.G. Sobolev ; S. Spataro ; B. Spruck ; H. Stroebele ; J. Stroth ; C. Sturm ; A. Tarantola ; K. Teilab ; P. Tlusty ; M. Traxler ; R. Trebacz ; H. Tsertos ; T. Vasiliev ; V. Wagner ; M. Weber ; C. Wendisch ; J. Wuestenfeld ; S. Yurevich ; Y. Zanevsky ;
Date 1 Nov 2013
AbstractWe 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 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, eta-> e+e-, at 90% CL.
Source arXiv, 1311.0216
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