Motivated by the R K and R K * anomalies from B decays, we extend the minimal supersymmetric model with a non-universal anomaly-free U (1) ′ gauge symmetry, coupling non-universally to the lepton sector as well as the quark sector. In particular, only the third generation quarks are charged under this U (1) ′ , which can easily evade the dilepton bound from the LHC searches. An extra singlet is introduced to break this U (1) ′ symmetry allowing for the µ-term to be generated dynamically. The relevant constraints of B s −B s mixing, D 0 −D 0 mixing and the LHC dilepton searches are considered. We find that in the allowed parameter space this U (1) ′ gauge interaction can accommodate the R K and R K * anomalies and weaken considerably the Z ′ mass limits while remaining perturbative up to the Planck scale.
Using a simplified framework, we attempt to explain the recent DAMPE cosmic e + + e − flux excess by leptophilic Dirac fermion dark matter (LDM). The scalar (Φ 0 ) and vector (Φ 1 ) mediator fields connecting LDM and Standard Model particles are discussed. We find that the couplings P ⊗ S, P ⊗ P , V ⊗ A and V ⊗ V can produce the right bump in e + + e − flux for a DM mass around 1.5 TeV with a natural thermal annihilation crosssection < σv >∼ 3×10 −26 cm 3 /s today. Among them, V ⊗V coupling is tightly constrained by PandaX-II data (although LDM-nucleus scattering appears at one-loop level) and the surviving samples appear in the resonant region, m Φ 1 2m χ . We also study the related collider signatures, such as dilepton production pp → Φ 1 → + − , and muon g −2 anomaly. Finally, we present a possible U(1) X realization for such leptophilic dark matter.
In the minimal supersymmetric standard model (MSSM), the bino-wino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density. However, such a scenario usually predicts a very small DM-nucleon scattering cross section that is below the neutrino floor, and can not be tested by DM direct detection experiments. In this work, we investigate the discovery potential of this bino-wino co-annihilation region by searching for the soft dilepton events from the process pp → χ . In the future HL-LHC with 3000 fb −1 luminosity, the corresponding mass limits can be pushed up to 430 (330) GeV.
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