Challenges in Double Beta Decay

Table 1

Summary table of 𝜈 properties from [12]. We use the convention where 𝑚₂>𝑚₁ (therefore 𝛿𝑚²>0 by construction) and 𝑚₃ is the most split state. We report here the 1𝜎 range for each parameter (note that in the case of 𝜃₂₃ we report a different range for normal (NH) or inverted hierarchy (IH)).

sin^2𝜃12	(0.29–0.32)
sin^2𝜃23	(0.037–0.0041) for NH or (0.037–0.0043) for IH
sin^2𝜃13	(0.022–0.027)
𝛿𝑚^2=(𝑚^22−𝑚^21)	(7.3–7.8) × 10^−5 [eV^2]
|Δ𝑚^2|=|𝑚^23−(𝑚^21+𝑚^22)/2|	(2.3–2.5) × 10^−3 [eV^2]