Searching a Dark Photon with HADES

Agakishiev, G.; Balanda, A.; Belver, D.; Belyaev, A.; Berger-Chen, J.C.; Blanco, A.; Böhmer, M.; Boyard, J.L.; Cabanelas, P.; Chernenko, S.

doi:10.1016/j.physletb.2014.02.035

Searching a Dark Photon with HADES

HADES

Collaboration

•

G. Agakishiev
(
- Dubna, JINR
)

Nov 1, 2013

7 pages

Published in:

Phys.Lett.B 731 (2014) 265-271

Published: Apr 4, 2014

e-Print:

1311.0216 [hep-ex]

DOI:

10.1016/j.physletb.2014.02.035

PDG:

{{\mathit \eta}}

\rightarrow

{{\mathit e}^{+}}{{\mathit e}^{-}}

Experiments:

GSI-HADES

View in:

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Abstract: (Elsevier)

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 MU=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.

Rare eta decays
Dark matter
Hidden sector
Dark photon
muon: magnetic moment
mixing: kinetic
eta: leptonic decay
photon: hidden sector
HADES
channel cross section: branching ratio: upper limit

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