Chronology of Milestone Events in Particle Physics - DIRAC 1931
Chronology of Milestone Events in Particle Physics

DIRAC 1931

Dirac, P.A.M.;
Quantized Singularities in the Electromagnetic Field
Proc. Roy. Soc. A133 (1931) 60;

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This paper puts forward a new idea concerning negative energies of electrons, and is concerned essentially with the reason for the existence of an elementary electric charge, which, by experiment, is known to exist. The theory when worked out gives a connection between the elementary electric charge and the elementary magnetic pole; it shows a symmetry between electricity and magnetism quite foreign to current views, but does not, however, give a theoretical value for e, the elementary electric charge. The paper also shows that quantum mechanics really does not preclude the existence of isolated magnetic poles, and discusses why these poles are not observed. (Science Abstract, 1931, 340. H. L. B.).

Related references
More (later) information appears in
P. A. M. Dirac, Phys. Rev. 74 (1949) 817;

  e e+ >1.2 MeV (Ecm) cs

Particles studied
  e+ ex, qn, mass
  ex, qn, mass
  monopole ex, qn, mass

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Prediction of the anti-electron (e+), anti-proton (), and an indication of the possible existence of magnetic monopoles.
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