Searching a dark photon with HADES

By R. Holzmann, M. Gumberidze. 2014

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The existence of a photon-like massive particle, the γ ‘ or dark photon, is postulated in several extensions of the Standard Model to explain some recent puzzling astrophysical observations, as well as to solve the sofar unexplained deviation between the measured and calculated values of the muon anomaly. The dark photon, unlike the conventional photon, would have mass and would be detectable via its mixing with the latter. We present a search for the e + e − decay of such a hypothetical particle, 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 (ϵ 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. Furthermore, an improved upper limit of 2.3 × 10−6 at 90% CL has been set on the branching ratio of the helicity-suppressed direct decay of the η meson η → e +e −.

View Paper: https://www.semanticscholar.org/paper/ab3ea19c6b52ad558b80a266994dc1ecee10f812

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Citations in the corpus

Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, background): “0.1 1 10 10010 - 9 10- 8 10- 7 10- 6 10- 5 10- 4 10- 3 Ki ne tic m ix in g pa ra m et er U70 E137 CHARM Phenix ATLAS (long-lived) KLOE SN LSND ɛ →h→2n1→2ɣD+2nD→4μ+Xpp 10% 40% 40% 40% 10% LHCb long-lived 35.9 fb-1 (13 TeV)CMS LHCbBaBar Orsay HADES 0.1% 1% 10% 40% ATLAS (prompt) CMS APEX/MAMI m [GeV]ɣ”
Particle physics models for the 17 MeV anomaly in beryllium nuclear decays (2016, background): “3 × 10−3 but only for masses heavier than 20 MeV [66].”