# Polarization of $J/\psi$ and $psi(2S)$ Mesons Produced in $p\bar{p}$ Collisions at 1.96 TeV

Abstract : We have measured the polarizations of $\jpsi$ and $\psiprime$ mesons as functions of their transverse momentum $\pt$ when they are produced promptly in the rapidity range $|y|<0.6$ with $\pt \geq 5 \pgev$. The analysis is performed using a data sample with an integrated luminosity of about $800 \ipb$ collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as $\pt$ increases from 5 to $30 \pgev$. These results are compared to the predictions of non-relativistic quantum chromo-dynamics and other contemporary models. The polarizations of $\jpsi$ and $\psiprime$ mesons from $B$-hadron decays are also reported.
Document type :
Journal articles

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Submitted on : Wednesday, October 3, 2007 - 12:49:34 PM
Last modification on : Tuesday, October 19, 2021 - 4:44:37 PM

### Citation

T. Aaltonen, J. Adelman, T. Akimoto, M.G. Albrow, B. Alvarez Gonzalez, et al.. Polarization of $J/\psi$ and $psi(2S)$ Mesons Produced in $p\bar{p}$ Collisions at 1.96 TeV. Physical Review Letters, American Physical Society, 2007, 99, pp.132001. ⟨10.1103/PhysRevLett.99.132001⟩. ⟨in2p3-00176371⟩

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