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Searching a Dark Photon with HADES

Abstract : 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 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.
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Contributor : Sophie Heurteau <>
Submitted on : Monday, November 25, 2013 - 10:39:10 AM
Last modification on : Wednesday, September 16, 2020 - 4:00:29 PM

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G. Agakishiev, A. Balanda, D. Belver, A. Belyaev, J. C. Berger-Chen, et al.. Searching a Dark Photon with HADES. Physics Letters B, Elsevier, 2014, 731, pp.265-271. ⟨10.1016/j.physletb.2014.02.035⟩. ⟨in2p3-00908672⟩



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