scholarly journals Majorana neutrinos, neutrino mass spectrum, and the|⟨m⟩|∼10−3  eVfrontier in neutrinoless double beta decay

2008 ◽  
Vol 77 (11) ◽  
Author(s):  
S. Pascoli ◽  
S. T. Petcov
Keyword(s):  
Mass Spectrum ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
M 10 ◽  
Neutrino Mass Spectrum ◽  
Majorana Neutrinos

scholarly journals IMPLICATIONS OF OBSERVED NEUTRINOLESS DOUBLE BETA DECAY

2001 ◽  
Vol 16 (38) ◽  
pp. 2469-2482 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS ◽  
U. SARKAR
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Confidence Level ◽  
Neutrinoless Double Beta Decay ◽  
Solar Neutrinos ◽  
Double Beta Decay ◽  
Atmospheric Neutrinos ◽  
Natural Choice ◽  
Mass Matrices ◽  
Majorana Neutrinos

Recently a positive indication of the neutrinoless double beta decay has been announced. We study the implications of this result taking into consideration earlier results on atmospheric neutrinos and solar neutrinos. We also include in our discussions the recent results from SNO and K2K. We point out that on the confidence level given for the double beta signal, the neutrino mass matrices are now highly constrained. All models predicting Dirac masses are ruled out and leptogenesis becomes a natural choice. Only the degenerate and the inverted hierarchical solutions are allowed for the three-generation Majorana neutrinos. In both cases we find that the radiative corrections destabilize the solutions and the LOW, VO and Just So solutions of the solar neutrinos are ruled out. For the four-generation case only the inverted hierarchical scenario is allowed.

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