Cosmological bounds on heavy neutrinos through the decays νH-->3νL and νH-->νLγ

Details Cosmological bounds on heavy neutrinos through the decays νH-->3νL and νH-->νLγ Cosmological bounds on heavy neutrinos through the decays νH-->3νL and νH-->νLγ

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phlb..122...33m&link_type=abstract

Physics Letters B, Volume 122, Issue 1, p. 33-36.

Physics

13

Scientific paper

We derive a cosmological bound on the branching ratio Γ(νH-->νLγ)/Γ(νH -->3νL).. Then we show that, in some of the models proposed which attempt to evade cosmological bounds on the masses of heavy neutrinos through enhancement of the decay mode νH-->3νL, this cosmological bound on the induced rate for the radiative mode νH-->νL γ imposes severe constraints on the parameters of the model.

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