Explaining Muon Magnetic Moment and AMS-02 Positron Excess in a Gauged Horizontal Symmetric Model

摘要

We extended the standard model with a fourth generation of fermions to explain the discrepancy in the muon magnetic moment and to describe the positron excess observed by AMS-02 experiment. We introduce a gauged SU (2)_Hv horizontal symmetry between the muon and the 4th generation lepton families and identified the 4th generation right-handed neutrino as the dark matter with mass ~700 GeV. The dark matter annihilates through SU(2)_(HV) gauge boson into final states(μ~+μ~- ) and (v_μ~c ν_μ). The SU(2)_(HV) gauge boson with mass ~1.4 TeV gives the required contribution to the muon (g - 2) and satisfy the experimental constraint from BNL measurement.