New classical spin theory as the limit of the Dirac equation

Abstract

By taking the classical limit in the tensor formulation of the Dirac equation, which was established in our preceding article, a new classical relativistic spin theory is obtained, which is different from the one due toKramers, coinciding with it only in non-relativistic approximation substantially. The theory yields the classical limit for Dirac particle, which is different from that due toPauli.