Radiative neutrino decay in superstring models

Details Radiative neutrino decay in superstring models Radiative neutrino decay in superstring models

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..180..347e&link_type=abstract

Physics Letters B, Volume 180, Issue 4, p. 347-352.

Physics

10

Scientific paper

The rate for the radiative decay of neutrinos is calculated in E6 superstring models with light colour triplet isosinglets h and hh. In contrast to the standard model, the rate is not suppressed either by the GIM mechanism or by helicity matching. Comparison with astrophysical data allows one to set an upper limit on the Yukawa couplings λQLh and λdcvch. Taking Mh,h = 0 (100 GeV) it is found that λe,μ, λe,μ < 10-3-10-4, compatible with mvc, mvμ in the range 10-100 eV. From the cosmological requirement of not photo-ionizing light elements after nucleosynthesis, it follows that the vτ must lie in the same mass range and consequently λτ, λτ < 10-3.
Address after 1 September: Research Institute for Theoretical Physics, University of Helsinki, SF-00170 Helsinki 17, Finland.

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