Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 81, Issue 10, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-021-09705-5
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Funding
- Helmholtz-Institut fur Strahlen undKern-physik (HISKP)
- University of Bonn
- Carl Zeiss Foundation [0653-2.8/581/2]
- Verbundprojekt (Germany) [05A17VTA]
- Joint Institute for Nuclear Research (JINR) (Dubna)
- Ministry of Science and Higher Education (MSHE)
- RAS (Russia)
- ETH Zurich
- SNSF (Switzerland) [169133, 186181, 186158, 197346]
- FONDECYT [1191103, 190845, 3170852]
- UTFSM [PI M 18 13]
- ANID PIA/APOYO (Chile) [AFB180002]
- Millennium Institute for Subatomic Physics at the High-energy frontier (SAPHIR) [ICN2019_044]
- ANID, Chile
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A new vector boson (A') decaying into two dark matter particles and an off-shell Dark Photon was studied to explain the muon anomalous magnetic moment discrepancy and predict the thermal dark matter relic abundance. Through Monte-Carlo simulations and experimental results, a significant portion of the parameter space was excluded, justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density.
We report the results of a search for a new vector boson (A') decaying into two dark matter particles chi 1 chi 2 of different mass. The heavier chi(2) particle subsequently decays to chi 1 and an off-shell Dark Photon A'* -> e(+)e(-). For a sufficiently largemass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in themuon anomalous magnetic moment at Fermilab. Remark- ably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained reanalyzing the previous NA64 searches for an invisible decay A' -> chi(chi) over bar and axion-like or pseudo-scalar particles -> gamma gamma. With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for A' masses from 2m(e) up to 390 MeV and mixing parameter e between 3 x 10(-5) and 2 x 10(-2).
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