Baryon Asymmetry and Neutrino Mixing

Details Baryon Asymmetry and Neutrino Mixing Baryon Asymmetry and Neutrino Mixing

1996-08-13

arxiv.org/abs/hep-ph/9608308v1

Phys.Lett. B389 (1996) 73-77

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex2e, 10 pages, 3 figures, uses epsfig

Scientific paper

10.1016/S0370-2693(96)01232-4

In theories where $B-L$ is a spontaneously broken local symmetry, the cosmological baryon asymmetry can be generated by the out-of-equilibrium decay of heavy Majorana neutrinos. We study this mechanism assuming a similar pattern of mixings and masses for leptons and quarks, as suggested by SO(10) unification. This implies that $B-L$ is broken at the unification scale $\Lambda_{\mbox{\scriptsize GUT}}\sim 10^{16}$ GeV, if $m_{\n_\m} \sim 3\cdot 10^{-3}$eV as preferred by the MSW explanation of the solar neutrino deficit. The observed value of the baryon asymmetry, $n_B/s \sim 10^{-10}$, is then obtained without any fine tuning of parameters.

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