The problems of simple elementary weakly interacting massive particles (WIMPs) appeal to extend the physical basis for nonbaryonic dark matter. Such extension involves more sophisticated dark matter candidates from physics beyond the Standard Model (BSM) of elementary particles. We discuss several models of dark matter, predicting new colored, hyper-colored or techni-colored particles and their accelerator and non-accelerator probes. The nontrivial properties of the proposed dark matter candidates can shed new light on the dark matter physics. They provide interesting solutions for the puzzles of direct and indirect dark matter search. *
Most of the traditional Technicolor-based models are known to be in a strong tension with the electroweak precision tests. We show that this serious issue is naturally cured in strongly coupled sectors with chiral-symmetric vector-like gauge interactions in the framework of gauged linear σ-model. We discuss possible phenomenological implications of such non-standard chiralsymmetric Technicolor scenario in its simplest formulation preserving the Standard Model (SM) Higgs mechanism. For this purpose, we assume the existence of an extra technifermion sector confined under extra SU (3) TC at the energy scales reachable at the LHC, Λ TC ∼ 0.1 − 1 TeV, and interacting with the SM gauge bosons in a chiral-symmetric (vector-like) way. In the framework of this scenario, the SM Higgs vev acquires natural interpretation in terms of the condensate of technifermions in confinement in the nearly conformal limit. We study the influence of the lowest lying composite physical states, namely, technipions, technisigma and constituent technifermions, on the Higgs sector properties in the SM and other observables at the LHC. We found out that the predicted Higgs boson signal strengths in γγ, vector-boson V V * and fermion ff decay channels can be sensitive to the new strongly-coupled dynamics and are consistent with the current SM-like Higgs boson observations in the limit of relatively small Higgs-technisigma mixing. At the same time, the chiral-symmetric Technicolor provides us with rich technipion phenomenology at the LHC, and its major implications are discussed in detail.
We suggest one of the possible ways to compensate the large negative quantum-topological QCD contribution to the vacuum energy density of the Universe by means of a positive constant contribution from a cosmological Yang-Mills field. An important role of the exact particular solution for the Yang-Mills field corresponding to the finite-time instantons is discussed. An interesting connection of the compensation mechanism to the color confinement in the framework of instanton models has been pointed out. Besides the Λ QCD scale, this proposal relies on one yet free dimensionless normalisation constant which cannot be fixed by the perturbative QCD theory, and thus should be fine-tuned for the exact compensation to hold. PACS numbers: 98.80.Qc, 98.80.Jk, 98.80.Cq, 98.80.Es
We analyze an extension of the Standard Model with an additional SU (2) hypercolor gauge group keeping the Higgs boson as a fundamental field. Vectorlike interactions of new hyperquarks with the intermediate vector bosons are explicitly constructed. We also consider pseudo-Nambu-Goldstone bosons caused by the symmetry breaking SU (4) → Sp(4). A specific global symmetry of the model with zero hypercharge of the hyperquark doublets ensures the stability of a neutral pseudoscalar field. Some possible manifestations of the lightest states at colliders are also examined. a
High-energy cosmic ray electrons interaction with Dark Matter particles are considered. In particular, a weakening of energy spectrum of cosmic electrons is predicted resulting from inelastic electron scattering on hyper-pions in the hypercolor extension of the Standard Model. Corresponding cross section and angular distributions of secondary neutrino are calculated and studied. We also briefly discuss some effects of scattering * 344103 Sodruzhestva str.35/1 apt.149, Rostov-on-Don, Russia. arXiv:1810.00372v1 [hep-ph] 30 Sep 2018 October 2, 2018 0:38 WSPC/INSTRUCTION FILE Neutrino˙DM 2 processes of such type.
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