Search

We have witnessed in the past decade the observation of a puzzling cosmic-ray excess at energies larger than 10 GeV. The AMS-02 data published this year have new ingredients such as the bump around 300 GeV followed by a drop at 800 GeV, as well as smaller error bars. Adopting the background used by the AMS-02 Collaboration in their analysis, one can conclude that previous explanations to the new AMS-02 such as one component annihilating and decaying dark matter as well as pulsars seem to fail at reproducing the data. Here, we show that in the right-handed neutrino portal might reside the answer. We discuss a decaying two-component dark matter scenario where the two-body decay products are right-handed neutrinos that have their decay pattern governed by the type-I seesaw mechanism. This setup provides a very good fit to the data; for example, a conservative approach including just statistical uncertainties leads to χ²/DOF~2.3 for mDM1=2150 GeV with t1=3.78×1026 s and mDM2=300 with t2=5.0×1027 s for MN=10 GeV, and, in an optimistic case, including systematic uncertainties, we find χ²/DOF~1.12, for MN=10 GeV, with mDM1=2200 GeV with t1=3.8×1026 s and mDM2=323 GeV with t2=1.68×1027 s. [ABSTRACT FROM AUTHOR]

This work deals with the right-handed sneutrino as thermal cold dark matter candidate. This scalar emerges in a supersymmetric version of the SU(3)c⊗SU(3)L⊗U(1)X gauge model where right-handed neutrinos are a natural component of leptonic chiral scalar supermultiplets. We first consider the issue of a 125 GeV Higgs boson mass in this model, showing that constraints on the stop mass and trilinear soft coupling are considerably alleviated compared to the minimal supersymmetric standard model. Then, we investigate the region of parameter space that is consistent with right-handed sneutrino as thermal cold dark matter, under the light of Planck results on the relic abundance and direct detection from the LUX experiment. This sneutrino mainly annihilates through an extra neutral gauge boson, Z′, and Higgs exchange so that the physics of dark matter is somewhat related to the parameters determining Higgs and Z′ masses. We then obtain that the right-handed sneutrino in this model must be heavier than 400 GeV to conform with Planck and LUX, simultaneously constraining the Z′ mass to be above 2400 GeV, which is in perfect agreement with LHC searches in a nonsupersymmetric version of this model. [ABSTRACT FROM AUTHOR]