Abstract
Abstract
We study the Standard Model singlet (“right-handed”) sneutrino
$$ {\tilde{\nu}}_R $$
ν
˜
R
dark matter in a class of U(1)′ extensions of the MSSM that originate from the breaking of the E
6 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 ≃ M
Z
′, 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
$$ {M}_{{\tilde{\nu}}_R}\simeq {M}_{Z\prime }/2 $$
M
ν
˜
R
≃
M
Z
′
/
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
$$ {\tilde{\nu}}_R $$
ν
˜
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.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference69 articles.
1. U. Amaldi, W. de Boer and H. Furstenau, Comparison of grand unified theories with electroweak and strong coupling constants measured at LEP, Phys. Lett.
B 260 (1991) 447 [INSPIRE].
2. P. Langacker and M.-x. Luo, Implications of precision electroweak experiments for M
t
, ρ
0
, sin2
θ
W
and grand unification, Phys. Rev.
D 44 (1991) 817 [INSPIRE].
3. J.R. Ellis, S. Kelley and D.V. Nanopoulos, Probing the desert using gauge coupling unification, Phys. Lett.
B 260 (1991) 131 [INSPIRE].
4. R.N. Mohapatra, Supersymmetric grand unification: An Update, in Proceedings, Summer School in Particle Physics, Trieste, Italy, June 21–July 9, 1999, pp. 336–394 (1999) [hep-ph/9911272] [INSPIRE].
5. J.R. Ellis, J.S. Hagelin, D.V. Nanopoulos, K.A. Olive and M. Srednicki, Supersymmetric Relics from the Big Bang, Nucl. Phys.
B 238 (1984) 453 [INSPIRE].
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