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We investigate how the Fine-Tuning (FT) in the B-L Supersymmetric StandardModel (BLSSM) compares to the Minimally Supersymmetric Standard Model (MSSM),where both models have universality. This is done for two scales: both low(i.e. collider) and high (i.e. Grand Unified Theory (GUT)) scales. We see thisis similar for both models and the two scale regimes. We also study thepossible Dark Matter (DM) candidates each model offers in a realistic scenariosatisfying relic density constraints. Our findings are that whilst theparameter space for the single MSSM DM candidate is severely constrained, theBLSSM offers multiple candidates in a much wider region.

Supersymmetric Gauged B-L Model of Dark Matter and Fine Tuning