Challenges in Double Beta Decay

Figure 1

Constraints induced by oscillation data (at 2𝜎 level) in the planes charted by any two among the absolute mass observables. Blue (red) bands refer to normal (inverted) hierarchy. Figure from Fogli et al. [12]. Here |⟨𝑚_𝜈⟩| is indicated as 𝑚_𝛽𝛽.

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