## Flavor and CP symmetries for leptogenesis and neutrinoless double beta decay

Preprint number: CP3-Origins-2016-5 DNRF90 and DIAS-2016-5
Authors: Claudia Hagedorn (CP3-Origins & DIAS) and Emiliano Molinaro (CP3-Origins & DIAS)

We focus on the generation of the baryon asymmetry $Y_B$
of the Universe via unflavored leptogenesis and the predictions of $m_{ee}$, the quantity measurable in neutrinoless double beta decay.
We show that the sign of $Y_B$ can be fixed and the allowed parameter range of $m_{ee}$ can be strongly constrained.
We argue on general grounds that the CP asymmetries $epsilon_i$ are dominated by the contribution associated with one
Majorana phase and that in cases in which only the Dirac phase is non-trivial the sign of $Y_B$ depends on further
in order to fix the sign of $Y_B$. As examples we discuss the series of flavor groups $Delta (3 , n^2)$ and $Delta (6 , n^2)$, $n geq 2$ integer,