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

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 Minimal radiative Dirac neutrino mass models

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
Julian Calle ◽  
Diego Restrepo ◽  
Carlos E. Yaguna ◽  
Óscar Zapata
Keyword(s):  
Neutrino Mass ◽  
Dirac Neutrino ◽  
Neutrino Mass Models

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.

Does cosmology imply a dirac neutrino mass?

1984 ◽  
Vol 146 (1-2) ◽  
pp. 46-50 ◽  
Author(s):  
Daniele Fargion ◽  
Michael G. Shepkin
Keyword(s):  
Neutrino Mass ◽  
Dirac Neutrino
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