J/Psi Polarization in 800-GeV p-Cu Interactions

Abstract

We present measurements of the polarization of the $J/\ddot{I}ˆ$ produced in 800-GeV proton interactions with a copper target. Polarization of the $J/\ddot{I}ˆ$ is sensitive to the $c\bar{c}$ production and hadronization processes. A longitudinal polarization is observed at large $x_F$, while at small $x_F$ the state is produced essentially unpolarized or slightly transversely polarized. No significant variation of the polarization is observed versus $p_T$.

4 pages, 3 figures