Muon anomalous magnetic moment and positron excess at AMS-02 in a gauged horizontal symmetric model

Abstract

We studied an extension of the standard model with a fourth generation of fermions to explain the discrepancy in the muon $(g-2)$ and explain the positron excess seen in the AMS-02 experiment. We introduce a gauged $SU(2{)}_{HV}$ horizontal symmetry between the muon and the 4th generation lepton families. The 4th generation right-handed neutrino is identified as the dark matter with mass $\sim 700$ GeV. The dark matter annihilates only to $({\mu }^{+}{\mu }^{-})$ and $({\nu }_{\mu }^c{\nu }_{\mu })$ states via $SU(2{)}_{HV}$ gauge boson. The $SU(2{)}_{HV}$ gauge boson with mass $\sim 1.4$ TeV gives an adequate contribution to the $(g-2)$ of muon and fulfill the experimental constraint from BNL measurement. The higgs production constraints from 4th generation fermions is evaded by extending the higgs sector.

arXiv commentJournal version, to appear in JHEP

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• Explaining AMS-02 positron excess and muon anomalous magnetic moment in dark left-right gauge model