Probing the muon $g-2$ with future beam dump experiments

Abstract

We consider the light $Z^{\prime }$ explanation of the muon $g-2$ anomaly. Even if such a $Z^{\prime }$ has no tree-level coupling to electrons, in general one will be induced at loop-level. We show that future beam dump experiments are powerful enough to place stringent constraints on$-$or discover$-$a $Z^{\prime }$ with loop-suppressed couplings to electrons. Such bounds are avoided only if the $Z^{\prime }$ has a large interaction with neutrinos, in which case the scenario will be bounded by ongoing neutrino scattering experiments. The complementarity between beam dump and neutrino scattering experiments therefore indicates that there are good prospects of probing a large part of the $Z^{\prime }$ parameter space in the near future.

18 pages, 6 figures

References in corpus (12)

• Secluded U(1) below the weak scale
• The $g-2$ of charged leptons, $\alpha (M_Z^2)$ and the hyperfine splitting of muonium
• Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
• Neutrino Trident Production: A Powerful Probe of New Physics with Neutrino Beams
• New Limits on Hidden Photons from Past Electron Beam Dumps
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Cosmology With a Very Light $L_{\mu }-L_{\tau }$ Gauge Boson
• Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
• Lepton flavor violating Z' explanation of the muon anomalous magnetic moment
• Detecting the $L_{\mu }-L_{\tau }$ gauge boson at Belle II
• Dirac neutrinos and $N_{\mathrm{eff}}$ II: the freeze-in case
• How dark is the ${\nu }_R$-philic dark photon?