Dark matter indirect detection signals and the nature of neutrinos in the supersymmetricU(1)B−Lextension of the standard model

Abstract

In this paper, we study the prospects for determining the nature of neutrinos in the context of a supersymmetric B − L extension of the standard model by using dark matter indirect detection signals and bounds on N eff from the cosmic microwave background data. The model contains two new dark matter candidates whose dominant annihilation channels produce more neutrinos than neutralino dark matter in the minimal supersymmetric standard model. The photon and neutrino counts may then be used to discriminate between the two models. If the dark matter comes from the B-L sector, its indirect signals and impact on the cosmic microwave background can shed light on the nature of the neutrinos. When the light neutrinos are of Majorana type, the indirect neutrino signal from the Sun and the galactic center may show a prompt neutrino box-feature, as well as an earlier cut-off in both neutrino and gamma ray energy spectra. When the light neutrinos are of Dirac type, their contribution to the effective number of neutrinos N eff is at a detectable level.

NLO+NLL collider bounds, Dirac fermion and scalar dark matter in the B–L model

“…In the situation where solid signals come from direct detection and indirect dark matter searches, twocomponent dark matter arises as a promising framework. Several publications in the past have focused on two-or multi-component dark matter [88,[114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130][131][132][133].…”

Generating x-ray lines from annihilating dark matter

“…Extensions with a sterile neutrino as dark matter candidate [15], axions or ALPs [16], axinos [17], pseudo-Nambu-Goldstone bosons [18] or supersymmetric models (gravitino [19], sgoldstino [20] or low scale supersymmetry breaking [21]) were proposed, all relying on processes ensuring a fine tuned lifetime τ 10 28 seconds to fit the observed line. Other more exotic candidates like decaying moduli [22], millicharged dark matter [23], dark atoms 1 [24], magnetic dark matter [26], majoron decay [27] or multicomponent [28] have been proposed. Another original model was studied in [29,30] with an eXciting dark matter, where the photons come from the transition from an excited state down to the ground state for the dark matter particle, which in this case can be significantly heavier than 3.5 keV.…”

Natural X-ray lines from the low scale supersymmetry breaking

“…In a similar way, the heaviest one X R , with the previous assumptions, is stable as well. 1 In the preparation of this paper, several papers also considered this possibility [8,22]. They studied two-body decay while we study three-body decay.…”