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The angular distributions of the decay products in the successive decayschi_c (chi_b) to J/psi (Upsilon) gamma and J/psi (Upsilon) to l+l- arecalculated as a function of the angular momentum composition of the decayingchi meson and of the multipole structure of the photon radiation, using aformalism independent of production mechanisms and polarization frames. Thepolarizations of the chi states produced in high energy collisions can bederived from the dilepton decay distributions of the daughter J/psi or Upsilonmesons, with a reduced dependence on the details of the photon reconstructionor simulation. Moreover, this method eliminates the dependence of thepolarization measurement on the actual details of the multipole structure ofthe radiative transition. Problematic points in previous calculations of thechi_c decay angular distributions are identified and clarified.

Determination of chi_c and chi_b polarizations from dilepton angular distributions in radiative decays