Are the electron spin and magnetic moment parallel or antiparallel vectors?
Abstract
A direct measurement of the relative orientation between the spin and magnetic moment of the electron seems to be never performed. The kinematical theory of elementary particles developed by the author and the analysis of the expectation value of Dirac's magnetic moment operator show that, contrary to the usual assumption, spin and magnetic moment of electrons and positrons might have the same relative orientation. Two plausible experiments for their relative orientation measurement are proposed.
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