Depletion of atmospheric muon-neutrino fluxes and structure of Majorana mass matrix

1993 ◽  
Vol 58 (2) ◽  
pp. 267-271 ◽  
Author(s):  
Morimitsu Tanimoto ◽  
Takemi Hayashi ◽  
Masahisa Matsuda
Keyword(s):  
Mass Matrix ◽  
Muon Neutrino ◽  
Majorana Mass ◽  
Atmospheric Muon ◽  
Neutrino Fluxes

scholarly journals Uncertainties in atmospheric muon-neutrino fluxes arising from cosmic-ray primaries

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
Justin Evans ◽  
Diego Garcia Gamez ◽  
Salvatore Davide Porzio ◽  
Stefan Söldner-Rembold ◽  
Steven Wren
Keyword(s):  
Cosmic Ray ◽  
Muon Neutrino ◽  
Atmospheric Muon ◽  
Neutrino Fluxes

scholarly journals THE TYPE-II SINGULAR SEE-SAW MECHANISM

2007 ◽  
Vol 22 (12) ◽  
pp. 2211-2222 ◽  
Author(s):  
K. L. MCDONALD ◽  
B. H. J. MCKELLAR
Keyword(s):  
Mass Matrix ◽  
The Body ◽  
Type Ii ◽  
Neutrino Spectrum ◽  
Majorana Mass ◽  
Mass Matrices ◽  
Majorana Neutrinos ◽  
Neutrino Fluxes ◽  
The Right ◽  
Structure Result

The singular see-saw mechanism is a variation of the see-saw mechanism whereby the right-chiral neutrino Majorana mass matrix is singular. Previous works employing the singular see-saw mechanism have assumed a vanishing left-chiral Majorana mass matrix. We study the neutrino spectrum obtained under a singular see-saw mechanism when the left-chiral neutrinos possess a nonzero Majorana mass matrix. We refer to this as the type-II singular see-saw mechanism. The resulting neutrino spectrum is found to be sensitive to the hierarchy of the Dirac and Majorana mass scales used and we explore the phenomenological consequences of the candidate hierarchies. The compatibility of the resulting spectra with the body of neutrino oscillation data is discussed. It is found that neutrino mass matrices with this structure result in 3+1 or 2+2 neutrino spectra, making it unlikely that this mass matrix structure is realized in nature. If the left-chiral Majorana mass matrix is also singular we show that a type-II singular see-saw mechanism can realize a spectrum of one active-sterile pseudo-Dirac neutrino in conjunction with two active Majorana neutrinos effectively decoupled from the sterile sector. This realizes a scheme discussed in the literature in relation to astrophysical neutrino fluxes.

scholarly journals TRIBIMAXIMAL MIXING IN NEUTRINO MASS MATRICES WITH TEXTURE ZEROS OR VANISHING MINORS

2011 ◽  
Vol 26 (07) ◽  
pp. 501-514 ◽  
Author(s):  
S. DEV ◽  
SHIVANI GUPTA ◽  
RADHA RAMAN GAUTAM
Keyword(s):  
Neutrino Mass ◽  
Mass Matrix ◽  
Mass Scale ◽  
Neutrino Mass Matrix ◽  
Seesaw Mechanism ◽  
Majorana Mass ◽  
Absolute Mass ◽  
Mass Matrices ◽  
The One ◽  
The Right

We study the existence of one/two texture zeros or one/two vanishing minors in the neutrino mass matrix with μτ symmetry. In the basis where the charged lepton mass matrix and the Dirac neutrino mass matrix are diagonal, the one/two zeros or one/two vanishing minors on the right-handed Majorana mass matrix having μτ symmetry will propagate via seesaw mechanism as one/two vanishing minors or one/two texture zeros in the neutrino mass matrix with μτ symmetry respectively. It is found that only five such texture structures of the neutrino mass matrix are phenomenologically viable. For tribimaximal mixing, these texture structures reduce the number of free parameters to one. Interesting predictions are obtained for the effective Majorana mass Mee, the absolute mass scale and the Majorana-type CP violating phases.

Atmospheric Muon Neutrino Fraction above 1 GeV [Phys. Rev. Lett. 79, 345 (1997)]

1997 ◽  
Vol 79 (14) ◽  
pp. 2754-2754 ◽  
Author(s):  
R. Clark ◽  
R. Becker-Szendy ◽  
C. B. Bratton ◽  
J. Breault ◽  
D. Casper ◽  
...  
Keyword(s):  
Muon Neutrino ◽  
Atmospheric Muon

scholarly journals SEESAW AND LEPTOGENESIS: A TRIANGULAR ANSATZ

2011 ◽  
Vol 26 (18) ◽  
pp. 1375-1379 ◽  
Author(s):  
D. FALCONE
Keyword(s):  
Charged Lepton ◽  
Mass Matrix ◽  
Triangular Matrix ◽  
Unitary Matrix ◽  
Seesaw Mechanism ◽  
Dirac Mass ◽  
Majorana Mass ◽  
Dirac Matrix

A triangular ansatz for the seesaw mechanism and baryogenesis via leptogenesis is explored. In a basis where both the charged lepton and the Majorana mass matrix are diagonal, the Dirac mass matrix can generally be written as the product of a unitary times a triangular matrix. We assume the unitary matrix to be the identity and then an upper triangular Dirac matrix. Constraints from bilarge lepton mixing and leptogenesis are studied.

scholarly journals Atmospheric Muon Neutrino Fraction above 1 GeV

1997 ◽  
Vol 79 (3) ◽  
pp. 345-348 ◽  
Author(s):  
R. Clark ◽  
R. Becker-Szendy ◽  
C. B. Bratton ◽  
J. Breault ◽  
D. Casper ◽  
...  
Keyword(s):  
Muon Neutrino ◽  
Atmospheric Muon
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