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29 March 2024
 
  » arxiv » 1412.1400

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The muon g-2 and searches for a new electrophobic sub-GeV dark boson in a missing-energy experiment at CERN
S.N. Gninenko ; N.V. Krasnikov ; V.A. Matveev ;
Date 3 Dec 2014
AbstractThe 3.6 sigma discrepancy between the predicted and measured value of the anomalous magnetic moment of positive muons can be explained by the existence of a new dark boson Zmu with a mass in sub-GeV range, which is coupled predominantly to the second and third lepton generations. After discussion of present phenomenological bounds on the Zmu coupling, we show that if the Zmu exists, it could be observed in the reaction mu+Z->mu+Z+Zmu of muon scattering off nuclei by looking for an excess of events with the large missing muon beam energy in a detector due to the prompt bremsstrahlung Zmu decay Zmu-> u u into a couple of neutrino. We describe the experimental technique and the preliminary study of the feasibility for the proposed search. We show that this specific signal allows the search for the Zmu with the sensitivity in coupling constant alpha_mu > 10^{-11}, which is three orders of magnitude higher the value required to explain the discrepancy. We point out that the availability of high energy and intensity muon beams at CERN SPS provides unique opportunity either to discover or rule out the Zmu in the proposed search in the near future. The experiment is based on the missing energy approach developed for the searches for invisible decays of dark photons and (pseudo)scalar mesons at CERN and is complementary to these experiments.
Source arXiv, 1412.1400
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