Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-05-28
Memorias de la 8a Reunion Nacional Academica de Fisica y Matematicas, Mayo 2003, ESFM-IPN, Eds. Jose M. Rivera et al., pp. 45-
Physics
High Energy Physics
High Energy Physics - Theory
In Spanish. Misprints corrected
Scientific paper
We study the theory of the Lorentz group (1/2,0)+(0,1/2) representation in the helicity basis of the corresponding 4-spinors. As Berestetski, Lifshitz and Pitaevskii mentioned, the helicity eigenstates are not the parity eigenstates. Relations with the Gelfand-Tsetlin-Sokolik-type quantum field theory are discussed. Finally, a new form of the parity operator (which commutes with the Hamiltonian) is proposed in the Fock space.
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