Abstract
In light of positive signals reported by the CDMS-II Si experiment and the recent results of the LUX and SuperCDMS experiments, we study isospin-violating dark matter scenarios assuming that the interaction of the dark matter is mediated by colored particles. We investigate the phenomenology of the model, including collider searches, flavor and CP phenomenology. A minimal possible scenario includes scalar dark matter and new vector-like colored fermions with masses of O(1) TeV as mediators. Such a scenario may be probed at the 14 TeV LHC, while flavor and CP constraints are stringent and severe tuning in the couplings is unavoidable. We also found that, as an explanation of the CDMS-II Si signal, isospin-violating fermionic dark matter models with colored scalar mediators are disfavored by the LHC constraints.
Highlights
Alternatives or varying assumptions about the Xenon scintillation efficiencies [17,18,19]
In light of positive signals reported by the CDMS-II Si experiment and the recent results of the LUX and SuperCDMS experiments, we study isospin-violating dark matter scenarios assuming that the interaction of the dark matter is mediated by colored particles
We investigate the phenomenology of the model, including collider searches as well as flavor and CP physics, paying particular attention to the parameter region which is consistent with CDMS-Si, LUX and SuperCDMS results
Summary
We study the case in which the DM interaction is dominated by spin-independent interaction. In the non-relativistic limit, the elastic scattering cross section of DM with a nucleus composed of Z protons and (A − Z) neutrons can be represented as σA. In the non-relativistic limit, the elastic scattering cross section of DM with a nucleus composed of Z protons and (A − Z) neutrons can be represented as σA. Fn and fp parametrize the coupling between DM and neutron and proton, respectively. Their explicit forms in terms of Lagrangian parameters are shown in the following subsections. If the isospin is violated and the ratio of the couplings satisfy a relation fn/fp ≃ −Z/(A − Z), the cross section σA is suppressed. In the isospin conserving case, fn = fp, this is equal to DM-proton cross section σp. Analysis, we consider the following representative point of isospin-violating DM: mDM = 8 GeV, σp = 4 × 10−40cm, fn/fp = −0.7. One can see that this point is marginally allowed by LUX and SuperCDMS, and is favored by CDMS-Si
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