CLASSICAL AND QUANTUM CONSTRAINTS IN SPIN PHYSICS

Constraints on spin observables coming from discrete symmetries such as P, C,
T and identical particles may be divided in two types: 1) classical ones, which insure
the invariance of the cross sections under the symmetry operation; 2) non-classical
ones, which can only be obtained at the level of amplitudes. Similarly, positivity
constraints can be divided into classical and non-classical constraints. The former
insure the positivity of the cross section for arbitrary individual polarisations of
the external particles, the latter extend this requirement to the case of entangled
external spins. The domain of classical positivity is shown to be dual to the domain
of separability.