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

Phys. Rev. Lett. 91, 211801 – Published 21 November 2003
T. H. Chang et al. (FNAL E866/NuSea Collaboration)


We present measurements of the polarization of the J/ψ produced in 800-GeV proton interactions with a copper target. Polarization of the J/ψ is sensitive to the cc¯ production and hadronization processes. A longitudinal polarization is observed at large xF, while at small xF the state is produced essentially unpolarized or slightly transversely polarized. No significant variation of the polarization is observed versus pT.

DOI: http://dx.doi.org/10.1103/PhysRevLett.91.211801

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  • Received 30 July 2003
  • Published 21 November 2003

© 2003 The American Physical Society

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