1999/03/15 by X. Y. Pham, Pham, X. Y.
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9903356
LaTeX 10 pages, 5 postscript figures. Lecture given at the Vth Viet-Nam School of Physics, Hanoi 28 December 1998 - 9 January 1999
arxiv created 1999/03/15 · openalex publication_date 1999/03/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 νH would not be stable. Although chargeless, it could decay -- by quantum loop effect -- into a lighter neutrino νL by emitting a photon: νH → νL + γ. If kinematically possible, the νH → νL + 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.