scholarly journals Could a Reported 2007 Analysis of Super-Kamiokande Data Have Missed a Detectable Supernova Signal from Andromeda?

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Robert Ehrlich
Keyword(s):  
Neutrino Mass ◽  
Search Method ◽  
Entire Period ◽  
Neutrino Masses ◽  
Sterile Neutrinos ◽  
Mass Eigenstates ◽  
Search Result ◽  
Sn 1987A

According to a 2007 paper there was no evidence for a neutrino burst of two or more events in Super-Kamiokande (SK) during the entire period of data taking from 1996 to 2005 from Andromeda or anywhere else. There is, however, a scenario under which a detectable signal could have been missed given the search method employed by the analysis, and it would have been found using an alternate method. The alternate method depends on the hypothesis that two of the neutrino mass eigenstates have masses 4.0 eV and 21.4 eV which was inferred from an analysis of the SN 1987A data. Although one might argue that the hypothesis of such large neutrino masses is remote, there is a way they could be compatible with observed constraints on neutrino masses involving a third tachyonic (m2<0) eigenstate, plus three sterile neutrinos. Given the importance of a positive supernova search result and the ease of conducting it using existing SK data, there would seem to be little reason not to do it.

Vanishing effective Majorana neutrino mass and light sterile neutrinos

2016 ◽  
Vol 31 (06) ◽  
pp. 1650040 ◽  
Author(s):  
Surender Verma
Keyword(s):  
Neutrino Mass ◽  
Mass Formula ◽  
Majorana Neutrino ◽  
Recent Measurement ◽  
Neutrino Masses ◽  
Sterile Neutrinos ◽  
Majorana Mass ◽  
Scatter Plots ◽  
Majorana Neutrino Mass ◽  
Neutrino Masses And Mixings

We examine the possibility of vanishing effective Majorana mass [Formula: see text] in the presence of one or two sterile neutrinos taking into account the recent data on neutrino masses and mixings, particularly, on [Formula: see text]. Also, within the framework of standard three active neutrinos, we find that effective Majorana mass [Formula: see text] can be vanishingly small if neutrino masses observe normal hierarchy. However, the same is not valid for inverted hierarchical neutrino masses. The predictions for Majorana phases [Formula: see text] and [Formula: see text] have also been obtained and shown as scatter plots. We also examine the condition [Formula: see text] within the framework wherein fermion sector has been extended by the addition of either one or two sterile neutrinos. The condition of vanishing effective Majorana mass is found to be inconsistent with the recent measurement of [Formula: see text] in these classes of models except for [Formula: see text], [Formula: see text] neutrino mass scheme for small values of the lightest neutrino mass, [Formula: see text].

scholarly journals Review of the Empirical Evidence for Superluminal Particles and the 3 + 3 Model of the Neutrino Masses

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Robert Ehrlich
Keyword(s):  
Dark Matter ◽  
Empirical Evidence ◽  
Neutrino Mass ◽  
Galactic Center ◽  
Neutrino Masses ◽  
Sn 1987A ◽  
Matter Model ◽  
Katrin Experiment ◽  
Dark Matter Model ◽  
Faster Than Light

A review is given of hypothetical faster-than-light tachyons and the development of the author’s 3+3 model of the neutrino mass states, which includes one tachyonic mass state doublet. Published empirical evidence for the model is summarized, including an interpretation of the mysterious Mont Blanc neutrino burst from SN 1987A as being due to tachyonic neutrinos having m2=-0.38eV2. This possibility requires an 8 MeV antineutrino line from SN 1987A, which a new dark matter model has been found to support. Furthermore, this dark matter model is supported by several datasets: γ-rays from the galactic center, and the Kamiokande-II neutrino data on the day of SN 1987A. The KATRIN experiment should serve as the unambiguous test of the 3+3 model and its tachyonic mass state.

Evading the Dirac-neutrino-mass constraint from SN 1987A

1992 ◽  
Vol 45 (10) ◽  
pp. R3312-R3315 ◽  
Author(s):  
K. S. Babu ◽  
Rabindra N. Mohapatra ◽  
I. Z. Rothstein
Keyword(s):  
Neutrino Mass ◽  
Dirac Neutrino ◽  
Sn 1987A ◽  
Mass Constraint

scholarly journals Parametrization of the Yukawa matrix in the scotogenic model and single-zero textures of the neutrino mass matrix

2019 ◽  
Vol 34 (19) ◽  
pp. 1950098 ◽  
Author(s):  
Teruyuki Kitabayashi
Keyword(s):  
Neutrino Mass ◽  
Mass Matrix ◽  
Branching Ratio ◽  
Neutrino Mass Matrix ◽  
Neutrino Masses ◽  
Neutrino Sector ◽  
The One ◽  
Relic Abundance ◽  
Analytical Expressions ◽  
Data Group

As the first topic, we propose a new parametrization of the complex Yukawa matrix in the scotogenic model. The new parametrization is compatible with the particle data group parametrization of the neutrino sector. Some analytical expressions for the neutrino masses with the new parametrization are shown. As the second topic, we consider the phenomenology of the scotogenic model with the one-zero-textures of the neutrino flavor mass matrix. One of the six patterns of the neutrino mass matrix is favorable for the real Yukawa matrix. On the other hand, for the complex Yukawa matrix, five of the six patterns are compatible with observations of the neutrino oscillations, dark matter relic abundance and branching ratio of the [Formula: see text] process.

NEUTRINO MASSES WITH DYNAMICAL ELECTROWEAK SYMMETRY BREAKING

2003 ◽  
Vol 18 (22) ◽  
pp. 3935-3946 ◽  
Author(s):  
THOMAS APPELQUIST
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Neutrino Mass ◽  
Electroweak Symmetry Breaking ◽  
Light Neutrino ◽  
Neutrino Masses ◽  
Electroweak Symmetry ◽  
Explicit Model ◽  
Dirac Neutrino ◽  
Mass Terms

In this talk I discuss the problem of accounting for light neutrino masses in theories with dynamical electroweak symmetry breaking. I will first describe this problem generally in a class of extended technicolor (ETC) models, describing the full set of Dirac and Majorana masses that arise in such theories. I will then present an explicit model exhibiting a combination of suppressed Dirac masses and a seesaw involving dynamically generated condensates of standard-model singlet, ETC-nonsinglet fermions. Because of the suppression of the Dirac neutrino mass terms, a seesaw yielding realistic neutrino masses does not require superheavy Majorana masses; indeed, the Majorana masses are typically much smaller than the largest ETC scale.

scholarly journals The Low-Scale Approach to Neutrino Masses

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Sofiane M. Boucenna ◽  
Stefano Morisi ◽  
José W. F. Valle
Keyword(s):  
Neutrino Mass ◽  
Cold Dark Matter ◽  
Short Review ◽  
Neutrino Masses ◽  
Lepton Flavor Violation ◽  
Mass Generation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Phenomenological Potential ◽  
Neutrino Mass Generation

In this short review we revisit the broad landscape of low-scaleSU(3)c⊗SU(2)L⊗U(1)Ymodels of neutrino mass generation, with view on their phenomenological potential. This includes signatures associated to direct neutrino mass messenger production at the LHC, as well as messenger-induced lepton flavor violation processes. We also briefly comment on the presence of WIMP cold dark matter candidates.

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