ψ' Polarization due to Color-Octet Quarkonia Production
Adam K. Leibovich
Abstract
We calculated the polarization of ψ' due to gg QQ[3PJ(8)]g ψλcolor-octet quarkonia production. We find that at low transverse momenta the ψ' is unpolarized due to the contributions proportional to the L=S=0 and L=S=1 color-octet matrix elements. As p increases, the ψ' mesons become 100% polarized, as predicted by fragmentation calculations. Polarization due to lowest order color-singlet production is also considered, which qualitatively has a similar shape to the color-octet production.
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