English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The 3.6 \sigma discrepancy between the predicted and measured values of theanomalous magnetic moment of positive muons can be explained by the existenceof a new dark boson Z_\mu with a mass in the sub-GeV range, which is coupledpredominantly to the second and third lepton generations through the L_\mu -L_\tau current . After a discussion of the present phenomenological bounds onthe Z_\mu coupling, we show that if the Z_\mu exists, it could be observed inthe reaction \mu+Z \to \mu+Z+Z_\mu of a muon scattering off nuclei by lookingfor an excess of events with large missing muon beam energy in a detector dueto the prompt bremsstrahlung Z_\mu decay Z_\mu \to \nu\nu into a couple ofneutrinos. We describe the experimental technique and the preliminary study ofthe feasibility for the proposed search. We show that this specific signalallows for a the search for the Z_\mu with a sensitivity in the couplingconstant \alpha_\mu > 10^{-11}, which is 3 orders of magnitude higher than thevalue required to explain the discrepancy. We point out that the availabilityof high-energy and -intensity muon beams at CERN SPS provides a uniqueopportunity to either discover or rule out the Z_\mu in the proposed search inthe near future. The experiment is based on the missing-energy approachdeveloped for the searches for invisible decays of dark photons and(pseudo)scalar mesons at CERN and is complementary to these experiments.

Muon g-2 and searches for a new leptophobic sub-GeV dark boson in a missing-energy experiment at CERN