Heavy neutrino threshold effects in low energy phenomenology
Right-handed neutrinos with mass of O (10 12 − 10 13) GeV are required to implement the see-saw mechanism and generate neutrino masses capable of playing a role in structure formation. Moreover models of fermion masses often relate the Yukawa couplings involving these neutrinos to the up-quark Yukaw...
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Published in | Nuclear physics. B Vol. 454; no. 1; pp. 25 - 44 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
06.11.1995
|
Online Access | Get full text |
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Summary: | Right-handed neutrinos with mass of
O
(10
12 − 10
13) GeV are required to implement the see-saw mechanism and generate neutrino masses capable of playing a role in structure formation. Moreover models of fermion masses often relate the Yukawa couplings involving these neutrinos to the up-quark Yukawa couplings. Here we study the effects of such couplings on the radiative corrections to quark masses. We find that
b −
τ equality at
M
GUT may still give the correct
m
b
/
m
τ
-ratio at low energies, but only if there is large μ − τ mixing in the charged leptonic sector. We propose specific mass matrix “textures” dictated by a
U(1) family symmetry whose structure preserves
m
b
=
m
τ
at
M
GUT. In these schemes, due to the large
ν
μ
−
ν
τ
mixing, it is possible to give a simultaneous solution to the solar neutrino deficit and the atmospheric neutrino problem. |
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ISSN: | 0550-3213 1873-1562 |
DOI: | 10.1016/0550-3213(95)00377-5 |