Dissecting Deuteron Compton Scattering I: The Observables with Polarised Initial States

Understand

A complete set of linearly independent observables in Compton scattering with arbitrarily polarised real photons off an arbitrarily polarised spin-1 target is introduced, for the case that the final-state polarisations are not measured.

• Adopted from the one widely used e.g.
• in deuteron photo-dissociation, it consists of 18 terms: the unpolarised cross section, the beam asymmetry, 4 target asymmetries and 12 asymmetries in which both beam and target are polarised.
• They are expressed by the helicity amplitudes and -- where available -- related to observables discussed by other authors.