Lower bound on e+e- decay of massive neutrinos

Details Lower bound on e+e- decay of massive neutrinos Lower bound on e+e- decay of massive neutrinos

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phlb..218...91c&link_type=abstract

Physics Letters B, Volume 218, Issue 1, p. 91-94.

Physics

7

Scientific paper

Astronomical observations of SN1987A, such as the light curve, spectral intensities of lines, the X-ray emission, etc., constrain the lifetime for the decay of a heavy neutrino 1 <~ mVH<=50 MeV through VH --> μ1+e++e- to exceed 4×1015 exp(-mVH/5 MeV) s. Otherwise, resulting ionization energy deposits and stronger X-ray emission would have been observed. This coupled with traditional cosmological considerationsargues that the lifetime of τ-neutrinos probably exceeds the age of the universe. This in turn would imply the standard cosmological mass bound does apply to μτ, namely mντ <~100h2eV (where h is the Hubble constant in units of 100 km s-1Mpc-1. The only significant loophole for these latter arguments would be if Vτ primarily decays rapidly into particles having very weak interactions.

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