The problem of constructing explicitly covariant representations for transitional currents of spin-1/2 particles is solved for both the nonrelativistic theory and the relativistic theory with massive particles. In the massless case, such representations exist only for transitional currents that are nondiagonal in helicity. The diagonal currents have algebraic representations that are not explicitly covariant.

PACS: 03.70.+k, 11.40.−q (all) DOI: 10.1070/PU1994v037n06ABEH000029 URL: https://ufn.ru/en/articles/1994/6/e/ A1994RB07800005 Citation: Krivoruchenko M I "Transitional currents of spin-1/2 particles" Phys. Usp. 37 601–606 (1994) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Криворученко М И «Токи перехода частиц со спином 1/2» УФН 164 643–649 (1994); DOI: 10.3367/UFNr.0164.199406e.0643