Discrimination of dark matter models in future experiments

Non-supersymmetric SO(10) grand unified theories provide a framework in which the stability of dark matter is explained while gauge coupling unification is realized. In this work, we systematically study this possibility by classifying weakly interacting dark matter candidates in terms of their quantum numbers of SU(2) L ⊗ U(1) Y , B − L, and SU(2) R . We consider both scalar and fermion candidates. We show that the requirement of a sufficiently high unification scale to ensure a proton lifetime compatible with experimental constraints plays a strong role in selecting viable candidates. Among the scalar candidates originating from either a 16 or 144 of SO(10), only SU(2) L singlets with zero hypercharge or doublets with Y = 1/2 satisfy all constraints for SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(3) C ⊗ SU(2) L ⊗ SU(2) R ⊗ U(1) B−L intermediate scale gauge groups. Among fermion triplets with zero hypercharge, only a triplet in the 45 with intermediate group SU(4) C ⊗ SU(2) L ⊗ SU(2) R leads to solutions with M GUT > M int and a long proton lifetime. We find three models with weak doublets and Y = 1/2 as dark matter candidates for the SU(4) C ⊗ SU(2) L ⊗ SU(2) R and SU(4) C ⊗ SU(2) L ⊗ U(1) R intermediate scale gauge groups assuming a minimal Higgs content. We also discuss how these models may be tested at accelerators and in dark matter detection experiments.

Section: /2mentioning

confidence: 97%

“…DM described by model S 1/2 2 is called the Inert Higgs Doublet DM [98][99][100][101], whose current status is summarized in refs. [102,103,112]. As discussed in these papers, favored mass regions for the S 1/2 2 DM that account for the correct DM abundance can be divided into two parts: m DM 100 GeV and m DM 500 GeV.…”

Section: Jhep10(2015)193mentioning

confidence: 99%

Weakly-interacting massive particles in non-supersymmetric SO(10) grand unified models

Nagata

Olive

Zheng

2015

“…For previous works on such DM candidates, see refs. [108][109][110][111][112][113][114][115][116][117][118][119][120]. Some theories beyond the Standard Model actually predict this kind of DM.…”

Section: Electroweakly-interacting Dmmentioning

confidence: 99%

QCD effects on direct detection of wino dark matter

Hisano

Ishiwata

Nagata

2015

118

130

Abstract:We complete the calculation of the wino-nucleon scattering cross section up to the next-to-leading order in α s . We assume that the other sparticles are decoupled and wino interacts with the Standard Model particles via the weak interaction. As a result, the uncertainties coming from the perturbative QCD are significantly reduced to be smaller than those from the nucleon matrix elements. The resultant scattering cross section is found to be larger than the leading-order one by about 70%, which is well above the neutrino background. In the limit of large wino mass the spin-independent scattering cross section with proton turns out σ −0.4 × 10 −47 cm 2 (errors come from perturbative calculation and input parameters, respectively). The computation for a generic SU(2) L multiplet dark matter is also presented.

“…Many aspects of the theory and phenomenology of SDM have been investigated in the past [7,[10][11][12][13][14][15], including the recent analysis of [8] where the constraints on the parameter space have been updated focusing on spin independent direct detection experiments.…”

Section: Jhep10(2015)116mentioning

confidence: 99%

Singlet-Doublet model: dark matter searches and LHC constraints

Calibbi

Mariotti

Tziveloglou

2015

100

125

Abstract:The Singlet-Doublet model of dark matter is a minimal extension of the Standard Model with dark matter that is a mixture of a singlet and a non-chiral pair of electroweak doublet fermions. The stability of dark matter is ensured by the typical parity symmetry, and, similar to a 'Bino-Higgsino' system, the extra matter content improves gauge coupling unification. We revisit the experimental constraints on the Singlet-Doublet dark matter model, combining the most relevant bounds from direct (spin independent and spin dependent) and indirect searches. We show that such comprehensive analysis sets strong constraints on a large part of the 4-dimensional parameter space, closing the notorious 'blind-spots' of spin independent direct searches. Our results emphasise the complementarity of direct and indirect searches in probing dark matter models in diverse mass scale regimes. We also discuss the LHC bounds on such scenario, which play a relevant role in the low mass region of the dark matter candidate.