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)Medline RefWorks RT Journal T1 Transitional currents of spin-1/2 particles A1 Krivoruchenko,M.I. PB Physics-Uspekhi PY 1994 FD 10 Jun, 1994 JF Physics-Uspekhi JO Phys. Usp. VO 37 IS 6 SP 601-606 DO 10.1070/PU1994v037n06ABEH000029 LK https://ufn.ru/en/articles/1994/6/e/ Оригинал: Криворученко М И «Токи перехода частиц со спином 1/2» УФН 164 643–649 (1994); DOI: 10.3367/UFNr.0164.199406e.0643