Heavy Quarkonium Production: Extending CSM and COM
Abstract
By questioning the applicability of the static approximation of the Colour-Singlet Model, we have seen that the production amplitude receives contributions from two different cuts. The first one in its static limit gives the colour-singlet mechanism. The second one has not been considered so far. We treat it in a gauge-invariant manner by introducing necessary new 4-point vertices, suggestive of the colour-octet mechanism. This new contribution can be as large as the colour-singlet mechanism at high pT, however these vertices are not totally constrained and when the freedom in their determination is fully exploited, we are able to reproduce the production cross-sections at the Tevatron for the J/Psi, Psi' and Upsilon(1S) and at RHIC for the J/Psi.
Keywords
Cite
@article{arxiv.hep-ph/0507118,
title = {Heavy Quarkonium Production: Extending CSM and COM},
author = {J. P. Lansberg},
journal= {arXiv preprint arXiv:hep-ph/0507118},
year = {2015}
}
Comments
Talk given at 13th International Workshop on Deep Inelastic Scattering (DIS 05), Madison, Wisconsin, 27 Apr - 1 May 2005 and at Phenomenology 2005 Symposium (PHENO 05), 2-4 May 2005, Madison, Wisconsin, 5 pages, 9 figures, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty (included)