2002/06/17 by Wilhelm I. Fushchych, Anatoly G. Nikitin
Physics and Astronomy · Mathematics · #quant-ph #math-ph #math.MP #nlin.SI
published as Lett.Nuovo Cim. 7 (1973) 439-442 · 4 pages
arxiv created 2002/06/17 · arxiv updated 2009/11/30
There are a number of papers dedicated to the description of free particles and antiparticles with zero mass and spin 1/2. A great many equations with different C, P, T properties have been proposed and the impression could be formed that there are many nonequivalent theories for zero-mass particles. The purpose or this paper is to show that it is not the case and to describe all nonequivalent equations.