High Energy Physics - Phenomenology
[Submitted on 30 Jul 1998]
Title:Baryon Asymmetry, Neutrino Mixing and Supersymmetric SO(10) Unification
View PDFAbstract: The baryon asymmetry of the universe can be explained by the out-of-equilibrium decays of heavy right-handed neutrinos. We analyse this mechanism in the framework of a supersymmetric extension of the Standard Model and show that lepton number violating scatterings are indispensable for baryogenesis, even though they may wash-out a generated asymmetry. By assuming a similar pattern of mixings and masses for neutrinos and up-type quarks, as suggested by SO(10) unification, we can generate the observed baryon asymmetry without any fine tuning, if (B-L) is broken at the unification scale \Lambda_{GUT}\sim 10^{16} GeV and, if m_{\nu_\mu} \sim 3\cdot 10^{-3} eV as preferred by the MSW solution to the solar neutrino deficit.
Submission history
From: Michael Pluemacher [view email][v1] Thu, 30 Jul 1998 15:21:56 UTC (207 KB)
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