Charmonium Production at the Tevatron

Abstract

We present in this work a study of large-\pt\ charmonium production in hadronic collisions. We work in the framework of the factorization model of Bodwin Braaten and Lepage, thereby including the color octet production mechanism, and extract the values of the necessary nonperturbative parameters from a comparison with the most recent data from the Fermilab 1.8 TeV $p\bar p$ hadron collider. We extend the calculation to 630 \gev, and compare the results with data published by the UA1 Collaboration. The global agreement is satisfactory, indicating that the largest components of the production mechanisms for charmonium production at high \pt\ have been isolated.

Figures (4)

• Figure 1: Inclusive prompt $\psi'$$p_T$ distribution. CDF data versus theory. The contribution from different sources is shown.
• Figure 2: Inclusive $\psi$$p_T$ distribution. Upper curves and data points correspond to prompt $\psi$'s, after subtraction of the $\chi_c$ contribution. Lower ones correspond to the $b$ decay contribution. CDF data versus theory.
• Figure 3: Inclusive $p_T$ distribution of $\psi$'s from $\chi_c$ production and decay. Upper curves and data points correspond to the prompt component. Lower ones correspond to the $b$ decay contribution. CDF data versus theory.
• Figure 4: Inclusive $p_T$ distribution of $\psi$'s at 630 GeV. All sources of $\psi$ production are here included. UA1 data versus theory. The parameters of the theoretical calculation take the values fitted on the Tevatron data.