Physics – Nuclear Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nuphb.236..233g&link_type=abstract
Nuclear Physics B, Volume 236, Issue 1, p. 233-254.
Physics
Nuclear Physics
8
Scientific paper
It is pointed out that the minimal left-right symmetric theory of the electroweak interactions based on SU(2)L × SU(2)R × U(1)B-L may accommodate right-handed neutrinos in the low-mass region of order 100 MeV or so, quite a few orders of magnitude below m(WR). When an attempt is made to construct such a scheme, consistent with the present upper limits on the left-handed neutrino masses, one faces the problem of the evasion of the cosmological bound of 50 eV on νμL. We show that this constraint may be avoided in a somewhat simplified scheme based on reasonable gross scales which characterize the Dirac and Majorana parts of the neutrino mass matrix. In a detailed study of the neutrino mass matrix this is shown not to be possible when the neutrino Dirac masses are assumed to be of the order of magnitude of the corresponding charged lepton masses. A phenomenologically consistent scheme with m(νR) ~ O(100 MeV) based on Dirac masses of order 1/10me is described.
Gronau Michael
Yahalom Ram
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