  We measure the ratio of cross section times branching fraction, $R_p \equiv
\sigma_{\chi_{c2}} {\cal B}(\chi_{c2} \to J/\psi \gamma)/ \sigma_{\chi_{c1}}
{\cal B}(\chi_{c1} \to J/\psi \gamma)$, in 1.1 fb$^{-1}$ of $p\bar{p}$
collisions at $\sqrt{s} =$ 1.96 TeV. This measurement covers the kinematic
range $p_T(J/\psi)>4.0$ GeV/$c$, $|\eta(J/\psi)| < 1.0$, and $p_T(\gamma)>1.0$
GeV/$c$. For events due to prompt processes, we find $R_p =
0.395\pm0.016(stat.)\pm0.015(sys.)$. This result represents a significant
improvement in precision over previous measurements of prompt $\chi_{c1,2}$
hadroproduction.

High Energy Physics - Experiment