Abstract
The angular distributions in the cascade decay process e +e − → ψ'(3684) → γχ → γγψ(3095) → γγμ + μ − are considered as a means of determining the spins and radiative couplings of the χ particles. The expression for the full angular distribution is brought into a simple factorized form using an approach suggested by spin diagrams. All moments of the distribution are tabulated for a χ spin ⩽2 and pure or mixed transitions with photon multipolarity ⩽2.
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