Higher Twist Corrections to the J/ψ–π Cross Section

Abstract

The J/ψπ → ]]> ]]> ]]> ]]> ]]> \bar{\rm D}{\rm D}^*$, D$\bar{\rm D}^*$, $\bar{\rm D}$D and $\bar{\rm D}^*$D$^*$ cross sections as a function of √{s} are evaluated in a QCD sum rule calculation. We find that our results are compatible with the J/ψπ → charmed mesons cross sections obtained with models based on meson exchange if a cut-off of order of 1 GeV is used.