Abstract
We study the Standard Model singlet (“right-handed”) sneutrino \( {\tilde{\nu}}_R \) dark matter in a class of U(1)′ extensions of the MSSM that originate from the breaking of the E6 gauge group. These models, which are referred to as UMSSM, contain three right-handed neutrino superfields plus an extra gauge boson Z′ and an additional SM singlet Higgs with mass ≃ MZ′, together with their superpartners. In the UMSSM the right sneutrino is charged under the extra U(1)′ gauge symmetry; it can therefore annihilate via gauge interactions. In particular, for \( {M}_{{\tilde{\nu}}_R}\simeq {M}_{Z\prime }/2 \) the sneutrinos can annihilate by the exchange of (nearly) on-shell gauge or Higgs bosons. We focus on this region of parameter space. For some charge assignment we find viable thermal \( {\tilde{\nu}}_R \) dark matter for mass up to ∼ 43 TeV. This is the highest mass of a good thermal dark matter candidate in standard cosmology that has so far been found in an explicit model. Our result can also be applied to other models of spin−0 dark matter candidates annihilating through the resonant exchange of a scalar particle. These models cannot be tested at the LHC, nor in present or near-future direct detection experiments, but could lead to visible indirect detection signals in future Cherenkov telescopes.
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Drees, M., Ferreira, F.A.G. A very heavy sneutrino as viable thermal dark matter candidate in U(1)′ extensions of the MSSM. J. High Energ. Phys. 2019, 167 (2019). https://doi.org/10.1007/JHEP04(2019)167
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DOI: https://doi.org/10.1007/JHEP04(2019)167