Little groups and Maxwell-type tensors for massive and massless particles

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Baskal S., Kim Y.

EUROPHYSICS LETTERS, vol.40, no.4, pp.375-380, 1997 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 4
  • Publication Date: 1997
  • Doi Number: 10.1209/epl/i1997-00474-0
  • Title of Journal : EUROPHYSICS LETTERS
  • Page Numbers: pp.375-380


The massive and massless representations of four-vectors and Maxwell-type tensors are constructed as bilinear combinations of SL(2, C)-spinors and are evaluated on a unified description upon adopting the group contraction procedure of O(3)-like little group to E(2)-like little group. Contraction of massive particle representations leads to gauge-dependent vectors as well as the gauge-independent ''state vectors'' constructed by Weinberg. It, is shown that gauge degrees of freedom associated with the translation-like transformations of the E(2)-like little group can be traced to the spinors that undergo spin hips in the infinite-momentum/zero-mass limit.