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

Abstract

We present measurements of the polarization of the $J/\psi$ produced in 800-GeV proton interactions with a copper target. Polarization of the $J/\psi$ 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

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