J/psi production in association with a charm-quark pair at the Tevatron

TL;DR

This paper investigates the production of J/psi particles alongside charm-quark pairs at the Tevatron, analyzing theoretical models and potential experimental signatures to improve understanding of quarkonium production mechanisms.

Contribution

It provides a leading-order NRQCD calculation of J/psi with charm pairs, including color-singlet and octet transitions, and compares results with fragmentation approximation.

Findings

Results suggest measurable signatures at the Tevatron.

Color-octet contributions are significant in the production process.

Comparison with fragmentation approximation highlights differences in predictions.

Abstract

I study the direct hadroproduction of J\psi associated with a charm-quark pair at leading order in alpha_S and v in NRQCD. This process provides an interesting signature that could be studied at the Tevatron. I consider both colour-singlet and colour-octet transitions. I compare our results to the fragmentation approximation and discuss the associated experimental signatures.