Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-07
Phys.Lett.B458:73-78,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages (Revtex); accepted for publication with small modifications; conclusions unchanged
Scientific paper
10.1016/S0370-2693(99)00568-7
Models of leptogenesis often invoke the out-of-equilibrium decays of heavy right-handed neutrinos in order to create a baryon asymmetry of the universe through the electroweak phase transition. Their presumed existence argues strongly for the presence of an $SU(2)_R$ gauge symmetry. We study the equilibrating effects of the resulting additional right-handed interactions and find that successful leptogenesis requires that $m_N \gtrsim 10^{16}$ GeV if $m_N > m_{W_R}$, and $m_{W_R} \gtrsim 3 \times 10^6 GeV (m_N /10^2 GeV)^{2/3}$ if $m_{N}
Ma Ernest
Sarkar Subir
Sarkar Utpal
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