Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-28
Acta Phys.Polon.B28:2225-2257,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
38 pages, Latex, epsfig, 10 poscript files Presented at the XXI Silesian School of Theoretical Physics on "Recent Progress in
Scientific paper
The problem if existing neutrinos are Dirac or Majorana particles is considered in a very pedagogical way. After a few historical remarks we recall the theoretical description of neutral spin 1/2 particles, emphasizing the difference between chirality and helicity which is important in our discussion. Next we describe the properties of neutrinos in the cases when their interactions are given by the standard model and by its extensions (massive neutrinos, right-handed currents, electromagnetic neutrino interaction, interaction with scalar particles). Various processes where the different nature of neutrinos could in principle be visible are reviewed. We clear up misunderstandings which have appeared in last suggestions how to distinguish both types of neutrinos.
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