Hadroproduction of Charmonium at Large $x_F$

Abstract

We present a higher-twist production mechanism for ${\eta }_c$ and ${\chi }_J$ charmonium at large momentum fraction $x_F$ in pion-nucleon collisions. The higher-twist contribution is essentially independent of $x_F$ and therefore becomes dominant at large $x_F$, where the leading-twist contribution falls off as $(1-x_F{)}^3$. We show that the higher-twist mechanism produces longitudinally polarized ${\chi }_1$ and ${\chi }_2$. For the ${\chi }_2$, this is clearly different from the leading-twist prediction of transverse polarization. For the ${\chi }_1$, the polarization of the leading- and higher-twist contributions is qualitatively similar.

14 pages, standard Latex, 3 figures included as an uuencoded Postscript file

References in corpus (7)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Rigorous QCD Predictions for Decays of P-Wave Quarkonia
• P-Wave Charmonium Production in B-Meson Decays
• Gluon fragmentation into polarized charmonium
• Angular Distributions in the Drell-Yan Process: A Closer Look at Higher Twist Effects
• Higher Twist Effects in the Drell-Yan Angular Distribution
• Hadroproduction and Polarization of Charmonium