Massive Neutrino Decays

Details Massive Neutrino Decays Massive Neutrino Decays

1999-03-15

arxiv.org/abs/hep-ph/9903356v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX 10 pages, 5 postscript figures. Lecture given at the Vth Viet-Nam School of Physics, Hanoi 28 December 1998 - 9 January

Scientific paper

Neutrino physics is used as an illustrative example for an elementary introduction to the computational method of Feynman loop-diagrams and decay rates. If the neutrinos are as massive as recently reported by the Super-Kamiokande results, the heaviest neutrino $\nu_H$ would not be stable. Although chargeless, it could decay -- by quantum loop effect -- into a lighter neutrino $ \nu_L$ by emitting a photon: $\nu_H \to \nu_L + \gamma $. If kinematically possible, the $\nu_H \to \nu_L$ + e$^+$ + e$^-$ mode could occur at the tree diagram level and furthermore get enhanced, at one-loop radiative corrections, by a large logarithm of the electron mass acting as an infrared cutoff.

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