Abstract
A simple parametrization of the spin density matrix is given which ensures that is a positive, Hermitian matrix which satisfies the parity symmetry conditions. There is a minimal number of parameters and they can vary independently; no complicated constraints on their allowed region of variation are required. A similar parametrization is given for the real part of . Rank conditions, polarized targets, and angular distributions are also discussed.
- Received 9 October 1974
DOI:https://doi.org/10.1103/PhysRevD.11.633
©1975 American Physical Society