Muon g-2 Anomaly and Dark Leptonic Gauge Boson

Abstract

One of the major motivations to search for a dark gauge boson of MeV-GeV scale is the long-standing muon g-2 anomaly. Because of active searches such as fixed target experiments and rare meson decays, the muon g-2 favored parameter region has been rapidly reduced. With the most recent data, it is practically excluded now in the popular dark photon model. We overview the issue and investigate a potentially alternative model based on the gauged lepton number or U(1)_L. The muon g-2 favored parameter region of the U(1)_L survives all the constraints that were critical in the dark photon case, yet it is disfavored by the new constraints from the large flux neutrino experiments.

Version to appear in PRD

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• Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS
• Muon g-2 and searches for a new leptophobic sub-GeV dark boson in a missing-energy experiment at CERN
• DAEdALUS and Dark Matter Detection
• Global Analysis of Leptophilic Z' Bosons
• Constraints on New Physics in the Electron g-2 from a Search for Invisible Decays of a Scalar, Pseudoscalar, Vector, and Axial Vector
• Evaporation Barrier for Dark Matter in Celestial Bodies
• Implications of Two-component Dark Matter Induced by Forbidden Channels and Thermal Freeze-out
• Restrained Dark $U(1{)}_d$ at Low Energies
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• Gauging lepton flavor SU(3) for the muon $g-2$
• Parity Violation by a Dark Gauge Boson
• The KLOE-2 Experiment at DAPHNE