Measurement of J / ψ and ψ (2S) polarization in pp̄ collisions at √s = 1.8 TeV - Affolder, T; Akimoto, H; Akopian, A; Albrow, MG; Amaral, P; Amendolia, SR; Amidei, D; Anikeev, K; Antos, J; Apollinari, G; Arisawa, T; Asakawa, T; et al. (Physical Review Letters, 2000)