# Angular distributions in the decays of the triplet D2 state of charmonium directly produced in polarized proton-antiproton collisions

#### Abstract

Using the helicity formalism, we calculate the combined angular distribution function of the two gamma photons and the electron in the cascade process pp → 3D2 → χJ+γ1 → (ψ+γ2)+γ1 → (e+ + e−)+γ1+γ2 (J=0,1,2), when p and p are arbitrarily polarized. We also present the partially integrated angular distribution functions in six different cases. Our results show that by measuring the two-particle angular distribution of γ 1 and γ 2 and that of γ 1 and e −, one can determine the relative magnitudes as well as the relative phases of all the helicity amplitudes in the two radiative decay processes 3D2→χ J +γ 1 and χ J →ψ+γ 2. PACS 11.80.Cr - 13.20.Fc

*This paper has been withdrawn.*