Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-22
Eur.Phys.J.C19:183-190,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 16 pages, No figures. Some additions in the text and references. Conclusions unaffected. To appear in Eur. Phys. J. C
Scientific paper
10.1007/s100520100575
Heavy right-handed neutrinos are of current interest. The interactions and decay of such neutrinos determine their decoupling epoch during the evolution of the universe. This in turn affects various observable features like the energy density, nucleosynthesis, CMBR spectrum, galaxy formation, and baryogenesis. Here, we consider reduction of right-handed electron-type Majorana neutrinos, in the left-right symmetric model, by the WR+ - WR- channel and the channel originating from an anomaly, involving the SU(2)R gauge group, as well as decay of such neutrinos. We study the reduction of these neutrinos for different ranges of left-right model parameters, and find that, if the neutrino mass exceeds the right-handed gauge boson mass, then the neutrinos never decouple for realistic values of the parameters, but, rather, decay in equilibrium. Because there is no out-of-equilibrium decay, no mass bounds can be set for the neutrinos.
Adhya Paramita
Chaudhuri Rai D.
Raychaudhuri Amitava
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