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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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