scholarly journals Vacuum neutrino oscillations of solar neutrinos and lepton mass matrices

1998 ◽  
Vol 59 (1) ◽  
Author(s):  
Morimitsu Tanimoto
Keyword(s):  
Neutrino Oscillations ◽  
Solar Neutrinos ◽  
Mass Matrices

scholarly journals NEUTRINO OSCILLATIONS AND THE EXACT PARITY MODEL

1994 ◽  
Vol 09 (02) ◽  
pp. 169-179 ◽  
Author(s):  
R. FOOT
Keyword(s):  
Neutrino Mass ◽  
General Result ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Atmospheric Neutrino ◽  
Solar Neutrinos ◽  
Specific Model ◽  
Neutrino Mixing ◽  
Mixing Angles ◽  
Significant Deficit

We re-examine neutrino oscillations in exact parity models. Previously it was shown in a specific model that large neutrino mixing angles result. We show here that this is a general result of neutrino mixing in exact parity models provided that the neutrino mass matrix is real. In this case, the effects of neutrino mixing in exact parity models is such that the probability of a given weak eigenstate remaining in that eigenstate averages to less than half when averaged over many oscillations. This result is interesting in view of the accumulating evidence for a significant deficit in the number of solar neutrinos. It may also be of relevance to the atmospheric neutrino anomaly.

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.

Neutrino Oscillations and Solar Neutrinos

Physics Today ◽  
1989 ◽  
Vol 42 (7) ◽  
pp. 28-36 ◽  
Author(s):  
Lincoln Wolfenstein ◽  
Eugene W. Beier
Keyword(s):  
Neutrino Oscillations ◽  
Solar Neutrinos

scholarly journals LEPTON MIXING AND THE NEUTRINO MIXING ANGLE θ13

2012 ◽  
Vol 27 (14) ◽  
pp. 1250079 ◽  
Author(s):  
HARALD FRITZSCH
Keyword(s):  
Radiative Correction ◽  
Neutrino Oscillations ◽  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Zero Mass ◽  
Mass Matrices ◽  
Texture Zero

We discuss the neutrino oscillations, using texture zero mass matrices for the leptons, including radiative correction. The neutrino mixing angle θ13 is calculated and agrees with the result of the new Daya Bay experiment.

scholarly journals FERMION MASSES AND MIXINGS IN GAUGE THEORIES

2002 ◽  
Vol 17 (28) ◽  
pp. 3981-4006 ◽  
Author(s):  
D. FALCONE
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Neutrino Mass ◽  
Quark Mass ◽  
Gauge Theories ◽  
Neutrino Oscillations ◽  
Heavy Neutrino ◽  
Fermion Masses ◽  
Mass Matrices ◽  
The Standard Model

The recent evidence for neutrino oscillations stimulate us to discuss again the problem of fermion masses and mixings in gauge theories. In the standard model, several forms for quark mass matrices are equivalent. They become ansatze within most extensions of the standard model, where also relations between quark and lepton sectors may hold. In a seesaw framework, these relations can constrain the scale of heavy neutrino mass, which is often related to the scale of intermediate or unification gauge symmetry. As a consequence, two main scenarios arise. Hierarchies of masses and mixings may be explained by broken horizontal symmetries.

OSCILLATION EFFECTS ON NEUTRINOS FROM THE EARLY PHASE OF A NEARBY SUPERNOVA

2000 ◽  
Vol 15 (14) ◽  
pp. 2105-2120
Author(s):  
DEBASISH MAJUMDAR ◽  
AMITAVA RAYCHAUDHURI ◽  
KAMALES KAR ◽  
ALAK RAY ◽  
FIROZA K. SUTARIA
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Neutral Current ◽  
Mass Difference ◽  
Solar Neutrinos ◽  
Electron Neutrino ◽  
Charged Current ◽  
Current Channel ◽  
Flavor Oscillation ◽  
Collapse Phase

Recent observations of atmospheric and solar neutrinos strongly support the phenomenon of neutrino oscillations — a manifestation of a nonzero and nondegenerate mass spectrum. Neutrinos emitted during stellar core collapse leading to a supernova are of the electron neutrino type at source — as for solar and reactor (anti-)neutrinos — and provide another useful tool in the search for flavor oscillations. Their propagation to an earth-bound detector involves length scales that can uniquely probe very small neutrino mass differences hitherto unobservable. Although the number of neutrinos emitted during the collapse phase is much smaller than that emitted in the post-bounce epoch (in which all flavors of neutrinos are emitted), a nearby supernova event may nevertheless register a substantial number of detections from the collapse phase at SuperKamiokande (SK) and the Sudbury Neutrino Observatory (SNO). The measurement of the fluence of these neutrinos at SNO and the distortion of the spectrum detected at SK can yield valuable information about neutrino mass difference and mixing which are illustrated here in terms of two- and three-flavor oscillation models. In particular, we find that R SNO , the ratio of the calorimetric detection of the neutrino fluence via the neutral current channel to the total energy integrated fluence observed via the charged current channel at SNO, is a sensitive probe for oscillations. We also find that αn, the ratio of the nth central moments of the distributions seen at SK and SNO (charged current), can be a useful tool (especially for n=3) to look for neutrino oscillations.

scholarly journals ASPECTS OF NEUTRINO MASS MATRICES

2005 ◽  
Vol 20 (06) ◽  
pp. 1188-1196
Author(s):  
P. H. FRAMPTON
Keyword(s):  
Cp Violation ◽  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Long Baseline ◽  
Mass Matrices

After an Introduction briefly describing the rise and fall of the three-zero texture of the Zee model, we discuss still-allowed two-zero textures for the Majorana three-neutrino mass matrix. Finally, a model with two right-handed neutrinos and two Dirac texture zeros is described (FGY model) which can relate CP violation in leptogenesis to CP violation in long-baseline neutrino oscillations.

scholarly journals Neutrino masses and flavor mixing

2015 ◽  
Vol 30 (16) ◽  
pp. 1530012 ◽  
Author(s):  
Harald Fritzsch
Keyword(s):  
Neutrino Oscillations ◽  
Neutrino Masses ◽  
Mixing Angle ◽  
Zero Mass ◽  
Mass Matrices ◽  
Flavor Mixing ◽  
Texture Zero ◽  
The Masses ◽  
Reactor Mixing

We discuss the neutrino oscillations, using texture zero mass matrices for the leptons. The reactor mixing angle θl is calculated. The ratio of the masses of two neutrinos is determined by the solar mixing angle. We can calculate the masses of the three neutrinos: m1 ≈ 0.003 eV , m2 ≈ 0.012 eV , m3 ≈ 0.048 eV .

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