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Baryon asymmetry of the universe and new neutrino states

The presence of additional neutrino states with masses in the GeV range is allowed by electro-weak precision observables. However, these additional states can lead to lepton number violating interactions which potentially can wash out considerably any GUT scale generated or elsewise pre-existing baryon asymmetry. We discuss the resulting bounds on neutrino parameters and find that - unless the baryon asymmetry is created at or below the electroweak scale or in some flavor which is decoupled from interactions to the new neutrino states - these have to be pseudo-Dirac with mass splittings between the right-handed and left-handed states of less than about ten keV.

preprint2011arXivOpen access
Sebastian HollenbergHeinrich PäsDario Schalla
hep-ph
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Open access3 authors1 topic
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Sebastian HollenbergHeinrich PäsDario Schalla

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