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

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

2003-07-31

arxiv.org/abs/hep-ex/0308001v1

Phys.Rev.Lett.91:211801,2003

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.211801

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} $.

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