Muon $g-2$ from Asymmetric Dark Matter in the Exo-Higgs Scenario
Hooman Davoudiasl A, Pier Paolo Giardino, Cen Zhang · arXiv (Cornell University) · 2016
The exo-Higgs model can accommodate a successful baryogenesis mechanism that closely mirrors electroweak baryogenesis in the Standard Model, but avoids its shortcomings. We extend the exo-Higgs model by the addition of a singlet complex scalar $\chi$ and a real scalar $\phi$. In our model, $\chi$ can be a viable asymmetric dark matter candidate, where $\phi$ facilitates efficient removal of dark matter antiparticles through conjugate pair annihilation. We predict the mass of the dark matter particle to be $m_\chi\approx1.3 \,\textrm{GeV}$. The leptophilic couplings of the dark matter particle $\chi$ can explain the $\sim 3.5\sigma $ muon $g-2$ anomaly. We also discuss the LHC signals of our scenario, and in particular the production and decays of exo-leptons which would lead to lepton pair plus missing energy final states.