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Author Michel, L.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ DENSITY MATRIX ♦ FIELD THEORY ♦ HELICITY ♦ MASS ♦ MATRICES ♦ MOMENTUM ♦ POLARIZATION ♦ QUANTUM MECHANICS ♦ RELATIVITY THEORY ♦ SPIN
Abstract A description is presented of a particle of mass m and spin j with a momentam p. A density matrix is used to describe a system of pure states and mixtures of polarization states. In the zero mass case only two polarization states are available and these have opposite helicities. An application of the Dirac theory was used to explicitly construct the density matrix of the pure polarization state. Any field theoretical computation of polarization effects can be made covariantly and reduces to trace computation; it is possible to describe the computation in terms of two by two density matrices. Application is made to the Bargmann-Wigner theory of particles of arbitrary spin in the polarization states.
ISSN 00296341
Educational Use Research
Learning Resource Type Article
Publisher Date 1959-10-01
Publisher Department Univ. of Paris
Journal Nuovo Cimento
Volume Number 14
Issue Number 1
Organization Univ. of Paris


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