Matter and dark matter asymmetry from a composite Higgs model

Abstract

We propose a low scale leptogenesis scenario in the framework of composite Higgs models supplemented with singlet heavy neutrinos. One of the neutrinos can also be considered as a dark matter candidate whose stability is guaranteed by a discrete $${\mathbb {Z}}_2 $$ Z 2 symmetry of the model. In the spectrum of the strongly coupled system, bound states heavier than the pseudo Nambu–Goldstone Higgs boson can exist. Due to the decay of these states to heavy right-handed neutrinos, an asymmetry in the visible and dark sector is simultaneously generated. The resulting asymmetry is transferred to the standard model leptons which interact with visible right-handed neutrinos. We show that the sphaleron-induced baryon asymmetry can be provided at the TeV scale for resonant bound states. Depending on the coupling strength of dark neutrino interaction, a viable range of the dark matter mass is allowed in the model. Furthermore, taking into account the effective interactions of dark matter, we discuss low-energy processes and experiments.

Filtered asymmetric dark matter during the Peccei-Quinn phase transition

“…For this PT, we study the first direction. 4 To have such a minimum, the potential should satisfy the condition V (min1) < V (min2) from which λ φ > µ 4 d /(f 4 a λ d ). Moreover, we are interested in the case in which m N i > m φ in the broken phase, thus y i > 2λ φ , where y i stands for the Yukawa couplings of heavy neutrinos in the diagonal form.…”

“…To explain the relic abundance of the cold DM from the early Universe, various mechanisms and candidates have been suggested. Due to the coincidence between the weak scale and massive particles with a mass range from GeV to TeV, and also relying on the cosmological expansion and thermal freeze-out mechanism, Weakly Interacting Massive Particle (WIMP) paradigm has been an attractive scenario [2], though direct detection searches disfavor some of these scenarios and lead us to consider other possibilities such as non-thermal DM models [3] and scenarios in which DM is produced in the decay of thermally-decoupled heavy particles [4,5]. Another remarkable fact about the DM energy density is its closeness to the abundance of asymmetric baryonic matter.…”

“…Another remarkable fact about the DM energy density is its closeness to the abundance of asymmetric baryonic matter. This may imply a common asymmetric origin for dark and visible matter and is the motivation for asymmetric DM scenarios [4,6].…”

“…Due to CP-violating effects, we obtain the net dark number density and hence the observed relic abundance can be found and survive after the PT. Moreover, the baryon asymmetry can be fulfilled due to asymmetric visible neutrinos via leptogenesis scenarios [4,18]. 2 We then explore phenomenological consequences of the model.…”