Abstract
We study the effect of lepton number violation (LNV) on baryon asymmetry, generated in the early Universe, in the presence of a dark sector with a global symmetry U(1)X, featuring asymmetric dark matter (ADM). We show that in general LNV, observable at the LHC or in neutrinoless double beta decay experiments, cannot wash out a baryon asymmetry generated at higher scales, unlike in scenarios without such dark sector. An observation of LNV at the TeV scale may thus support ADM scenarios. Considering several models with different types of dark matter (DM), we find that the DM mass is of the order of a few GeV or below in our scenario.
Highlights
Both, the cogent astrophysical evidence for dark matter (DM) and the baryon asymmetry of the Universe, call for the existence of new physics beyond the Standard Model (SM)
We have considered asymmetric dark matter (ADM) scenarios with a dark sector which possesses a global symmetry U (1)X and the impact of lepton number violation (LNV) processes on the particle–antiparticle asymmetries in the dark and the visible sectors
We have shown in a model-independent way and with several examples that B, L and X asymmetries can be preserved in an ADM scenario, even in the presence of LNV processes that violate L by two units and that are efficient at temperatures T ∼ 1 TeV
Summary
The cogent astrophysical evidence for DM and the baryon asymmetry of the Universe, call for the existence of new physics beyond the Standard Model (SM). Contributions to 0νββ decay due to new particles with masses around the TeV scale [27,28], will imply LNV processes efficient at temperatures T ∼ 1 TeV. These in combination with SM sphaleron processes [30,31], that violate (B + L) and are efficient above the sphaleron decoupling temperature Tsph, can lead to the washout of both baryon number (B) and L asymmetries [32].
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