Using the helicity formalism, we calculate the combined angular distribution function of the two gamma photons and the electron in the cascade process p̄p → 3 D 2→χ J +γ 1 and χ J →ψ+γ 2 → (e+ + -) + γ1 + γ2 (J=0,1,2), when p̄ 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 3 D 2→χ J +γ 1 and χ J →ψ+γ 2.
|Number of pages||14|
|Journal||European Physical Journal C|
|Publication status||Published - Sept 2009|
Scopus Subject Areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)