χ_{cJ} polarizations at the Fermilab Tevatron

Abstract

We propose the measurement of ${\chi }_{cJ}$ polarizations at high energy hadron colliders to study heavy quarkonium production mechanism. We find that the color-singlet model in the $k_t$ factorization approach predicts very different behavior for ${\chi }_{cJ}$ polarizations at the Fermilab Tevatron compared with the NRQCD predictions in the collinear parton model. In the color-singlet $k_t$ factorization approach, for both ${\chi }_{c1}$ and ${\chi }_{c2}$ productions, the helicity $h=0$ states dominate over other helicity states at large $p_T$. These properties are very useful in distinguishing between the two production mechanisms which are related to the interesting issue of $J\psi$ and ${\psi }^{\prime }$ polarizations, and may provide a crucial test for the $k_t$ factorization approach.

PLB in press

References in corpus (3)

• Measurement of J/Psi and Psi(2S) Polarization in ppbar Collisions at sqrt(s) = 1.8 TeV
• Polarization of Prompt J/psi at the Tevatron
• Polarized J/psi from chi_{cJ} and psi' Decays at the Tevatron

Cited by in corpus (3)

• Quarkonium Production at High-Energy Colliders
• Charmonium Production at High Energy in the k_T-Factorization Approach
• Polarizations of J/ψand ψ' in hadroproduction at Tevatron in the k_t factorization approach