Polarizations of J/psi and psi(2S) Mesons Produced in ppbar Collisions at 1.96 TeV

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The CDF coordinate system has z ^ \hat{z} along the proton direction, x ^ \hat{x} horizontal pointing outward from the Tevatron ring, and y ^ \hat{y} vertical. θ \theta ( ϕ \phi ) is the polar (azimuthal) angle measured with respect to z ^ \hat{z} , and η \eta is the pseudorapidity defined as − ln ⁡ ( tan ⁡ ( θ / 2 ) ) -{\rm ln}\;({\rm tan}\;(\theta/2)) . The transverse momentum of a particle is denoted as p T = p ​ sin ​ θ \mbox{$p_{T}$}=p\;{\rm sin}\;\theta

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