The CDF collaboration, T. Affolder
Published 2000-04-25, updated 2000-08-17Version 2
We have measured the polarization of J/Psi and Psi(2S) mesons produced in p\bar{p} collisions at \sqrt{s} = 1.8 TeV, using data collected at CDF during 1992-95. The polarization of promptly produced J/Psi [Psi(2S)] mesons is isolated from those produced in B-hadron decay, and measured over the kinematic range 4[5.5] < P_T < 20 GeV/c and |y| < 0.6. For P_T \gessim 12 GeV/c we do not observe significant polarization in the prompt component.
Comments: Revised version, accepted for publication in Physical Review Letters
Journal: Phys.Rev.Lett.85:2886-2891,2000
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